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STL - IDA

$224 Find cheap flights from St. Louis to Idaho Falls

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 Idaho Falls departing on 7/14. 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

Search hundreds of travel sites at once for deals on flights to Idaho Falls

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Idaho Falls, 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 Idaho Falls, 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:

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from St. Louis to Idaho Falls (STL-IDA)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Idaho Falls 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
5:20 pm - 10:49 amSTL-IDA
18h 29m2 stops
1:46 pm - 1:04 pmIDA-STL
22h 18m2 stops
Thu, Sep 19 - Mon, Sep 23
7:57 am - 10:49 amSTL-IDA
27h 52m3 stops
1:46 pm - 1:04 pmIDA-STL
22h 18m2 stops
Thu, Sep 19 - Mon, Sep 23
2:34 pm - 11:56 pmSTL-IDA
10h 22m1 stop
4:20 pm - 1:25 pmIDA-STL
20h 05m1 stop
$422Alaska Airlines
Find Deal
Thu, Sep 19 - Mon, Sep 23
7:57 am - 10:49 amSTL-IDA
27h 52m3 stops
5:45 pm - 4:20 pmIDA-STL
21h 35m3 stops
Thu, Sep 19 - Mon, Sep 23
7:32 pm - 11:57 pmSTL-IDA
29h 25m1 stop
4:20 pm - 1:25 pmIDA-STL
20h 05m1 stop
$482Alaska Airlines
Find Deal
Sat, Aug 17 - Fri, Aug 23
7:12 am - 9:31 pmSTL-IDA
15h 19m2 stops
6:14 am - 3:27 pmIDA-STL
8h 13m1 stop
$500American Airlines
Find Deal
Sat, Aug 17 - Fri, Aug 23
10:09 am - 10:10 pmSTL-IDA
13h 01m2 stops
6:10 am - 5:03 pmIDA-STL
9h 53m2 stops
$532Delta
Find Deal
Sat, Aug 17 - Fri, Aug 23
9:05 am - 1:27 pmSTL-IDA
5h 22m1 stop
5:55 pm - 3:49 pmIDA-STL
20h 54m2 stops
$537United Airlines
Find Deal
Thu, Sep 19 - Mon, Sep 23
7:55 am - 12:23 pmSTL-IDA
5h 28m1 stop
6:59 pm - 12:55 amIDA-STL
4h 56m1 stop
$576Delta
Find Deal
Wed, Aug 7 - Sun, Aug 11
5:30 pm - 9:08 pmSTL-IDA
28h 38m2 stops
5:59 pm - 4:28 pmIDA-STL
21h 29m2 stops
$755United Airlines
Find Deal
Wed, Aug 7 - Sun, Aug 11

Flights from St. Louis to Idaho Falls - Travel Insights & Trends

Get data-powered insights and trends into flights from St. Louis to Idaho Falls 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 Idaho Falls?

The average price of all flights from St. Louis to Idaho Falls clicked on KAYAK for each day over the last 12 months.
When flying from St. Louis to Idaho Falls, you should consider leaving on a Saturday and avoid Mondays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Tuesdays and the most expensive ones on Mondays.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from St. Louis to Idaho Falls, 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 Idaho Falls is February, where tickets cost $414 on average. On the other hand, the most expensive months are June and March, where the average cost of tickets is $702 and $701 respectively.

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

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The best deals for a one-way ticket found by KAYAK users over the last 3 days were on Alaska Airlines ($342) and Delta ($604). The cheapest round-trip tickets were found on Alaska Airlines ($422) and American Airlines ($500).

Good to know

Low season

August

High season

May

Cheapest flight

$224
Best time to beat the crowds but there is an average 1% increase in price.
Most popular time to fly with an average 15% increase in price.
Flight from St. Louis to Idaho Falls

When to book flights from St. Louis to Idaho Falls

Are your dates flexible? Find out the best times to travel from St. Louis to Idaho Falls 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 Idaho Falls

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

    In the last 3 days, the lowest price for a flight from St. Louis to Idaho Falls was $224 for a one-way ticket and $375 for a round-trip.

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

    No

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

    St. Louis and Idaho Falls are both served by 1 main airport. You will leave St. Louis from Lambert-St Louis and will be arriving at Idaho Falls Fanning Field.

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

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

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

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

  • Which is the best airline for flights from St. Louis to Idaho Falls, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Idaho Falls are Delta and United Airlines. With an average price for the route of $595 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $616 and an overall rating of 7.4.

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

    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 Idaho Falls.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Idaho Falls 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 Idaho Falls?

    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 Idaho Falls with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and IDA 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 Idaho Falls?

    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 Idaho Falls 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 airlines flying from St. Louis to Idaho Falls

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Idaho Falls. 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 Idaho Falls? 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
DeltaOverall score based on 10000 reviews
8.6Crew
7.4Food
8.0Entertainment
7.9Comfort
8.2Boarding
Airline reviews

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

2.0 MediocreCraig, Jun 2024CVG - LGA
Read more about Delta reviews

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.

Book cheap flights from St. Louis to Idaho Falls

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Idaho Falls found on KAYAK in the last 72 hours.
7/14Sun
2 stops
21h 43mSTL-IDA
$224
7/14Sun
3 stops
24h 44mSTL-IDA
$248
7/14Sun
1 stopAlaska Airlines
29h 25mSTL-IDA
$342
6/23Sun
1 stopDelta
4h 52mSTL-IDA
$604
6/23Sun
2 stopsAmerican Airlines
16h 43mSTL-IDA
$970

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Last minute flights from St. Louis to Idaho Falls

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from St. Louis to Idaho Falls that are departing in the next 10 days.
6/17Mon
multi-stopUnited Airlines
5h 23mSTL-IDA
7/26Fri
multi-stopUnited Airlines
27h 21mIDA-STL
$665
6/17Mon
multi-stopUnited Airlines
5h 23mSTL-IDA
7/26Fri
multi-stopUnited Airlines
19h 37mIDA-STL
$670
6/17Mon
multi-stopUnited Airlines
12h 07mSTL-IDA
7/26Fri
multi-stopUnited Airlines
19h 37mIDA-STL
$675
6/15Sat
multi-stopAmerican Airlines
5h 48mSTL-IDA
6/17Mon
multi-stopAmerican Airlines
8h 14mIDA-STL
$814
6/15Sat
multi-stopUnited Airlines
12h 07mSTL-IDA
6/17Mon
multi-stopUnited Airlines
17h 50mIDA-STL
$1,002
6/15Sat
multi-stopUnited Airlines
12h 07mSTL-IDA
6/17Mon
multi-stopUnited Airlines
20h 45mIDA-STL
$1,047

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St. Louis - Idaho Falls Flights

Departure:

St. Louis (STL)United States

Destination:

Idaho Falls (IDA)United States

Return flight deals:

Idaho Falls - St. Louis

Cabin classes: