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STL - BOI

$110 Find cheap flights from St. Louis to Boise

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Boise departing on 6/24. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Fri 7/12
Fri 7/19

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Boise, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Boise, as well as popular online travel agencies
In the last 7 days travelers have searched 44,148,666 times on KAYAK, and here is why:

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Cheap flight deals from St. Louis to Boise (STL-BOI)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Boise that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
6:30 pm - 12:15 amSTL-BOI
6h 45m1 stop
3:12 pm - 11:28 pmBOI-STL
7h 16m1 stop
$208Delta
Find Deal
Thu, Aug 8 - Mon, Aug 12
6:30 pm - 12:15 amSTL-BOI
6h 45m1 stop
11:55 am - 5:34 pmBOI-STL
4h 39m1 stop
$257Delta
Find Deal
Wed, Jul 31 - Wed, Aug 7
10:19 am - 9:07 pmSTL-BOI
11h 48m2 stops
5:00 am - 5:11 pmBOI-STL
11h 11m2 stops
$298United Airlines
Find Deal
Sat, Aug 17 - Sat, Aug 24
8:01 am - 2:49 pmSTL-BOI
7h 48m1 stop
3:44 pm - 10:52 pmBOI-STL
6h 08m1 stop
$316American Airlines
Find Deal
Tue, Jul 23 - Fri, Aug 2
1:59 pm - 8:49 pmSTL-BOI
7h 50m1 stop
12:20 pm - 4:20 pmBOI-STL
27h 00m3 stops
$317Spirit Airlines
Find Deal
Thu, Sep 19 - Mon, Sep 23
5:22 am - 10:56 amSTL-BOI
6h 34m1 stop
3:44 pm - 10:52 pmBOI-STL
6h 08m1 stop
$336American Airlines
Find Deal
Wed, Jul 17 - Mon, Jul 22
1:59 pm - 8:49 pmSTL-BOI
7h 50m1 stop
9:49 pm - 1:04 pmBOI-STL
14h 15m1 stop
$344Spirit Airlines
Find Deal
Thu, Oct 3 - Sun, Oct 6
2:25 pm - 9:11 amSTL-BOI
19h 46m2 stops
5:45 am - 1:28 pmBOI-STL
6h 43m1 stop
$461Alaska Airlines
Find Deal
Thu, Oct 3 - Sun, Oct 6
7:32 pm - 8:33 amSTL-BOI
14h 01m2 stops
9:08 pm - 1:20 pmBOI-STL
15h 12m2 stops
$508Alaska Airlines
Find Deal
Wed, Aug 7 - Sun, Aug 11
3:43 pm - 10:36 pmSTL-BOI
7h 53m1 stop
5:27 pm - 12:17 pmBOI-STL
17h 50m2 stops
$560United Airlines
Find Deal
Sat, Jul 27 - Mon, Jul 29

Flights from St. Louis to Boise - Travel Insights & Trends

Get data-powered insights and trends into flights from St. Louis to Boise to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from St. Louis to Boise?

The average price of all flights from St. Louis to Boise clicked on KAYAK for each day over the last 12 months.
If your flying dates are flexible, you should consider flying to Boise on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from St. Louis to Boise. For your return ticket, we recommend flying on a Tuesday and avoiding Mondays for the best deals.

What is the cheapest month to fly from St. Louis to Boise?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from St. Louis to Boise, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from St. Louis to Boise is January, where tickets cost $346 on average. On the other hand, the most expensive months are March and June, where the average cost of tickets is $643 and $541 respectively.

How far in advance should I book a flight from St. Louis to Boise?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from St. Louis to Boise, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from St. Louis to Boise, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 68 days before departure.

Which airlines provide the cheapest flights from St. Louis to Boise?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the past 3 days, the cheapest one-way tickets to Boise from St. Louis were found on Spirit Airlines ($110) and American Airlines ($153), and the lowest round-trip tickets were found on Delta ($208) and United Airlines ($298).

Good to know

Low season

March

High season

September

Cheapest flight

$110
Best time to beat the crowds but there is an average 38% increase in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from St. Louis to Boise

When to book flights from St. Louis to Boise

Are your dates flexible? Find out the best times to travel from St. Louis to Boise based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Boise

  • What is the cheapest flight from St. Louis to Boise?

    In the last 3 days, the lowest price for a flight from St. Louis to Boise was $110 for a one-way ticket and $208 for a round-trip.

  • Do I need a passport to fly between St. Louis and Boise?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from St. Louis to Boise?

    When flying out of St. Louis you will be using Lambert-St Louis. You will be landing at Boise, also known as Boise Air Term. Gowen Fld.

  • Which aircraft models fly most regularly from St. Louis to Boise?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Boise?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between St. Louis and Boise, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from St. Louis to Boise, Delta or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Boise are Delta and Alaska Airlines. With an average price for the route of $462 and an overall rating of 8.0, Delta is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $388 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from St. Louis to Boise?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Boise.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Boise?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boise from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Boise?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Boise with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and BOI can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Boise?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Boise from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top 5 airlines serving from St. Louis to Boise

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Boise. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Boise? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9269 reviews
7.3Entertainment
7.9Comfort
8.2Boarding
7.3Food
8.6Crew
Airline reviews

First class only upgrades seat width. The bottom cushion of the seat sloped forward so much that I was constantly sliding out of my seat. The meal was awful, granola and dried fruit? Seriously, for what I paid to upgrade? I can bring my own sawdust and rotten fruit for a whole lot less. Priority boarding is great except when you have a hundred economy passengers stranding in the aisle slamming you in the face with their enormous carry ons and smelly asses right under your nose. I want my money back for that leg of my trip. It wasn’t worth the money for such a minimal upgrade.

4.0 OkayAnonymous, Jun 2024MKE - SEA
Read more about Alaska Airlines reviews

First class only upgrades seat width. The bottom cushion of the seat sloped forward so much that I was constantly sliding out of my seat. The meal was awful, granola and dried fruit? Seriously, for what I paid to upgrade? I can bring my own sawdust and rotten fruit for a whole lot less. Priority boarding is great except when you have a hundred economy passengers stranding in the aisle slamming you in the face with their enormous carry ons and smelly asses right under your nose. I want my money back for that leg of my trip. It wasn’t worth the money for such a minimal upgrade.

I had never flown Alaska Airlines before. I’ll definitely use them again. Seats were comfortable and roomier than expected.

Seats lack shoulder and elbow room. The lady next to me was short and slightly heavy with knee problems, she kept jabbing me with her elbow while playing her game on her phone for 2 hours, the duration of the whole flight. It was frustrating and annoying! I was in the middle seat, there was no space to adjust to avoid her arm jabbing me.

I was in second from last seat. My luggage was in row 15. I asked the stewardess if I could move up before the plane lands. There were 3 empty rows. She went on to explain to me, how no one was sitting there when the plane took off and there was no education on the exit doors. Blah, blah, blah. I said ok, S he kept over explaining to me. So whatever if that’s the rules. She went in the back to the other 2 stewards to tell them the entire conversation I just had with her. Not only could I hear her so could all the back rows of the plane. This was very unprofessional and inappropriate.

Soda cans were mini-size; snacks were teeny. Options for entertainment on trans-continent flights were bad - no seat screens and no way to support device (as seen on other airlines) so had to hold device in position. Just overall, not good (compared to United)

I like the big picture of the Eskimo on the tail of the plane.

The crew members were wonderful. When we encountered a little turbulence, the pilots let us know and provided an estimate of how long it would last. Another nice amenity: every seat has AC power outlets and USB ports. It was a 6-hour flight, which seems a bit much for a single-aisle jet: over 200 passengers with access to only 3 restrooms (assuming you time it right and won't be blocked in by beverage carts); food is mediocre, over-priced, and (if you failed to reserve a meal ahead of time) the flight attendants have to process food/meal sales in the aisle. To access any entertainment, you must use your own device to log on to the plane's wi-fi (or bring your own entertainment).

The crews on Alaska Airlines are really wonderful. They clearly know how to treat passengers with kindness and respect. During my trip, I discovered that my upgraded seat had been changed when reviewing my electronic boarding pass. When I questioned the change at the gate, the two staff members acknowledged that the change was odd, checked on their computer, and confirmed that I still had my upgraded seat (i.e., the electronic boarding pass was incorrect). I was impressed by how they seemed to be "in my corner" from the start, quickly investigated, and provided me with a paper boarding pass with the correct information "just in case." All that said, I was a bit disappointed that Alaska Airlines uses single-aisle jets with only four restrooms (3 at the back of the plane, one at the front (ostensibly reserved for crew and first class travelers). I would understand for short flights, but for a 6-hour flight from Seattle to Honolulu...really? I will stick with Hawaiian Airlines from now on.

Seats are more spacious than other airlines that have you packed like sardines.

Barbara at JFK terminal for Alaska was very helpful in retrieving our boarding passes for our connecting and quite pleasant!! Thanks

3 hours late and all they have is was a $12 meal voucher. That’s not even enough to cover fast food.

Among the poorest flights I’ve had with Delta in a while. Entertainment system failed completely on a 7.5 hr flight. Crew seemed distracted and not the normal friendly crew. Flight overbooked it seemed… very crowded.

If I can, I always fly Delta. I’ve found their service to always be reliable and pleasant.

You could have not cancelled the flight (AA, which I will be flying from now on) left for BOS despite the fictitious weather issues (that no one in my Boston family could see). You could have rebooked my direct flight to another direct flight instead of sending me though JFK, the worst US airport after O’Hara You could have rebooked me on a Main Cabin seat (like the one I paid for in my original ticket instead of putting me a the last row on JFK->BOS leg, pocketing the difference in ticket price But I do not really care whether you will ever do that in a future because in a future neither I nor anyone from my company (unless they pay out of pocket) nor an of my clients and partners (if they heed my advice) will ever be caught dead on any of Delta flights

Really bad baggage handling. Had my Rimowa bag badly damaged at the latches.

It was pretty good I was worried with the short Layover that I might not catch my connection but the gate was there

It was good until there was a 3 hour delay because there was not any pilots to fly the plane.

There was plenty of overhead room but half of the passengers were told they had to check their carryon bags. My partner and I checked in as early as possible and our seats were split across the aisle.

Friendly flight attendants. Comfort plus seats were very comfortable and had lots of leg room. 10A and 10 B.

Flew first class so everything was great. But maybe because the flights were red eye, no meals were served, just chips. I flew Alaska Air 1st class at 9PM (2 hour flight) and they served beef short rib sliders!

The entertainment wasn’t playing in the app or online.

It is a modern tragedy that any airline expects you to travel for 14 hours in such discomfort and that the only way to add comfort is exorbitant prices. I was in pain by the time we landed. Shameful.

Original plane sidelined. Had to wait an hour for replacement.

Crew was very cooperative and professional. Passenger's first checked in bag should be free.

No real agent onsite helping you for missing luggage there. Not like the other airline next to UA desk, they have staff attending in their desk assisting answer/helping luggage issue, even after midnight.

Horrible, the flights kept delaying, so it is obvious that we won't be able to make it to the next connection. No easier/real agent on site to help you figure this out. UA agent on other counters refuse to assist you and direct us to use the QR code/call customer service. So inefficient and poor. While technology seems convenient, but it's not the best interest/experience for customers need help while there is active issue need assistance.

After the morning frenzy of 35 min wait through CLT security at 4;30 AM, it was nice to have a smooth pleasant boarding experience. This 6:30 AM flight was not full. We were able to get seated swiftly and took off promptly. Nice touch they distributed the old fashioned headsets with 8 mm jacks. Snacks were decent and arrival was uneventful.

My window shade didn’t work. So I missed coming into my city. ☹️

Flight was delayed in the gate by 5 hours and ultimately cancelled- rebooking service by United agents was terrible

Flight was delayed due to the late arrival of the catering truck, which is quite unacceptable. There was a beverage service, but no pretzel, or cookie, or nuts were served in coach.

Paid for premium economy had no tv the whole time the crew tried to reset/reboot but would not work they said they would put a trouble ticket in for it. We had 3 seats my tv was the only one that didn't work. They cancelled our flight re worked us on another that left us at airport over night on the floor I have a ten year old and a 78 diabetic mother which also had shingles and suffers from nerve pain in legs and back. Requested wheelchair service at all airports after the re route NO wheelchair service was there to help. WORST experience we have ever had. Went to American airlines assistance it was closed. I AM FURIOUS!!! I expect some sort of compensation from this traumatic experience and no need for flying points we don't plan on using American airlines again!!!!

This is by far the worst experience I have had with American Airlines. The start of this trip was a complete disaster. I purposely planned my trip so that I would weather any delays so that I could make very important meeting at the Pentagon. My flight was cancelled because of maintenance and I was put on the first flight the next day but I was late to the meeting. After a long week at the Pentagon I just wanted to go home and my flight home which was early in the day was delayed. Eventually the flight was delayed until the next day. I was not authorized a hotel room because DCA was my point of origin. So I paid for a hotel out of pocket. The flight this morning was boarded then deplaned because the aircraft was hot. The flow of information was not happening in DCA and made it worse when the news was bad. I am going to take a break from American for my next few military flights. Hopefully whatever has been going on with American Airlines will be resolved.

We had a 2 hour delay. The seats were smaller than most other airlines. The person in front of us wanted to lay back and we had to stop her because she was pressing against my girlfriend’s legs. We had to ask her to sit up and not lay back due to the lack of room.

Everything was fine once we actually got on our flight. It was more then annoying they canceled (delayed) our flight. We lost out on a day of our trip along with money on our stay. Plus we had to book another hotel. So expensive.

This flight was canceled and delayed several times without explanation. The plane was freezing cold and no wifi for messaging. Getting off the plane was terribly unorganized and felt like it took forever….

The flight was delayed several times without explanation. The seats were terribly uncomfortable and wifi isn’t included. All these make for a less than ideal flight.

The flights was delayed by hours and it was the firmest landing I have experienced in my life. My back is still sore.

Internet service was erratic. Crew service was poor and slow. My luggage on this non-stop flight was lost and not recovered

Terrible. I didn’t fly and I had an important meeting the next day.

Equipment swap led to 2+ hour delay on international flight. And to top it off, boarding took forever.

My flight was uncomfortable and crammed. There were no pockets to store things, I couldn’t move my seat back slightly. Beverages including soda cost extra. My husband flew on another spirit airline flight, which was delayed a total of 48 hours, only to be canceled.

Two delays in less than 24hrs. They need to improve everything and restructure the whole company.

Terrible leg room, seats don’t recline, delayed flight, and even water isn’t free onboard

Flight was canceled less than 6 hours before takeoff, rebooked on a flight that was twice as long and left earlier so we couldn’t make it, when using text support option took over 2 hours to speak with someone.

Not enough help at airport during boarding process. Flight was delayed. Overall WORST flying experience I’ve ever had. Will NEVER FLT SPIRIT AGAIN

Terrible legroom, seats do not recline, tray table the size of an iPhone, delayed flight, have to pay 5$ to get a cup of water onboard.

Could have TV/Movie and some water ou soda free

Flight was good and clean but delayed over an hour on the return flight.

The non stop flight and able to go into Atlantic City airport. They could lower the prices. It starts out low but then if you want to bring luggage and pick your seat the price goes up quite a bit.

Flight got diwngraded last minute and left us stranded. I was told I’ll be given credit for my luggage and seat upgrades but haven’t got anything yet

Book cheap flights from St. Louis to Boise

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Boise found on KAYAK in the last 72 hours.
6/24Mon
1 stopSpirit Airlines
6h 42mSTL-BOI
$110
7/16Tue
2 stopsSpirit Airlines
27h 02mSTL-BOI
$147
7/16Tue
1 stopAmerican Airlines
6h 11mSTL-BOI
$153
7/16Tue
3 stops
24h 58mSTL-BOI
$158
7/16Tue
2 stopsAlaska Airlines
12h 29mSTL-BOI
$203
7/31Wed
3 stops
31h 59mSTL-BOI
$272
6/24Mon
2 stopsAlaska Airlines
14h 39mSTL-BOI
$328
7/16Tue
3 stopsUnited Airlines
20h 54mSTL-BOI
$363

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St. Louis - Boise Flights

Departure:

St. Louis (STL)United States

Destination:

Boise (BOI)United States

Return flight deals:

Boise - St. Louis

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