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Find cheap flights from St. Louis to Pennsylvania from $42

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 Pennsylvania departing on 6/28. 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
Sat 6/15
Sat 6/22

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Best Pennsylvania Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Philadelphia
Philadelphianonstop$48
Pittsburgh
Pittsburgh1 stop$123
Harrisburg
Harrisburg1 stop$195
Allentown
Allentown1 stop$216
Scranton
Scranton1 stop$276
State College
State College1 stop$494
New York
New York1 stop$104

Good to know

Low season

January

High season

June

Cheapest flight

$42
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly and prices are also 8% lower on average.
Flight from St. Louis to Philadelphia

FAQs - booking Pennsylvania flights

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

    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 Pennsylvania.

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

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

    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 Pennsylvania with an airline and back to St. Louis with another airline.

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

    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 Pennsylvania 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 tips for finding cheap flights to Pennsylvania

  • Looking for a cheap flight? 25% of our users found tickets from St. Louis to the following destinations at these prices or less: Washington, D.C. $149 one-way - $253 round-trip; New York $164 one-way - $288 round-trip; Philadelphia $156 one-way - $333 round-trip
  • Morning departure is around 8% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top 5 airlines serving from St. Louis to Pennsylvania

 
Need help choosing which airline to fly with from St. Louis to Pennsylvania? 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 10673 reviews
7.9Comfort
8.2Boarding
8.6Crew
8.0Entertainment
7.4Food
Airline reviews

5-hour delay due to storms in Tanoa and airspace restricted by Miami traffic controllers.

6.0 GoodGary, May 2024MSP - TPA
Read more about Delta reviews

5-hour delay due to storms in Tanoa and airspace restricted by Miami traffic controllers.

A regional sized plane was used for a cross country flight with no overhead bin space. I had to "pink check" my laptop and my medications. I was NOT pleased!!!!

Absolutely nothing flight was cancelled and delayed for 2 days. Barely a heads up I want a full refund

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

Best airline! Always friendly and welcoming. Skyclub was great and loved the fast free wifi on board. I also love that you can pre-order your meal on the app!

Atlanta boarding crew at gate were filled with arrogance and were disrespectful. In flight crew showed indifference to the needs of passengers. This is about the flight from ATL to BDL.

Boarding was somewhat chaotic. Unable to evaluate crew or food/drink because captain kept them seated due to turbulence. Have no idea if entertainment was offered.

The gate area was incredibly short staffed, with one representative manning 4-5 flights, which caused a 3 hr delay in boarding even though the plane was all ready to leave. Other flights also were delayed because of this. The flight crew was awesome and I feel bad for the only gate worker on call, but Delta needs to hire more employees.

Very frustrated with boarding gate crew. She announced the plane was small and they would be limiting us to one item to carry on. Not a problem for me as I understand the tiny planes have limited space!! Not the case here! It was a rather large plane and had plenty of room for bags! So because I don’t want to be one of “those people” who ignores the request to check a carry on I did so asking if I would be able to pick it up at the bottom of the ramp on arrival in Knoxville to which she responded “yes”! Then I watched as every other passenger held onto their 2 items and boarded!! Then when we arrived in Knoxville our 2 carry ons had been put with all the other luggage and we had to go to baggage pick up and wait for all the big checked bags to come off the carousel! So she lied!! Frustrating. Next time I won’t be so nice!

It was a good experience except when boarding a female flight attendant did not go out of her way to assist my teenage daughters in finding space for their carry-ons after their compartments were full.

The overall flight went well and the aircrew was pleasant.

Very comfortable Prem economy seats for a long haul flight. Had a problem with the tv that the crew fixed so was great!

Cathay Pacific seems to be an airline in trouble and on its way out. Lots of broken or poorly functioning things like entertainment screens, seats, and enough well trained staff to handle a full flight. Sad...

The flight crew was exceptionally good. Personal needs were well met. The food choices were very nice.

Excellent. Planes are a little older and could get some refurbishment, but besides that everything was excellent.

While I was in great pain, the seat was sufficiently comfortable to allow me to rest and not be in so much pain.

we were upgraded which was a blessing and tender mercy for us. I fell the day before and was in extreme pain from knee to shoulder. Sitting in a more comfortable seat during the flight was an unexpected blessing and experience.

Seats were very comfortable. Crew were excellent. Food very good.

Flight crew was especially thoughtful and attentive, made sure our seats were comfortable so we could rest on the long flight

I felt thirsty and asked the flight attendent for water, but no one came for more than half an hour.

No lounge access with “United First” ticket. False alarm about late flight, jeopardizing connection. Wrong meal. Loose power socket would not hold plug, could not charge device. In-flight access to text messaging did not work. Toilet seat on plane would not stay up.

We ended up with seats in the very back. So they did not recline. Have no idea why, we reserved and checked in very early. The isles were very narrow and the seats had very little leg room. But they did give us water, and a snack.

Check in etc was very good. As for on the plane, it was like flying in a freezer. It was so cold, i have flown for years and never been so cold on a plane. Staff on board said its always cold when flying which is a load of rubbish. They wouldnt put any heating on and now i have the flu because of this .

I’ve had a couple flights this week on United that were delayed by an hour or more

Surprisingly easy! I was hesitant to try this, but the cost swayed me. I actually felt like I had less stress than all the taxiing and possible delays that occur with short regional flights where you spend less time in the air than getting to and from the plane..

This flight was delayed multiple times and eventually canceled around 2-3ish. Original take off time was around 10:30am. By 3, there were no other options out of Houston, so stuck in Houston for from 3pm - 11am the next day.

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

The plane was dirty and the in seat air wasn't blowing as planes usually do.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

Tray table was filthy when I sat down. I needed to have someone come clean it because there was food and stains on it WiFi didn’t work after paying for in-flight WiFi. Food was terrible and was not filling at all Chicken was rubbery Flight attendant had an attitude, interrupted me and wasn’t able to answer basic questions about the food selection such as “does the chicken have red sauce in it”. If your flight attendants are not going to know what is in the meals so we can make an educated decision based on dietary restrictions, they shouldn’t be on the plane. My 1.5 year old niece was sleeping and dropped her binkie. I went on the ground under the chairs looking for it. It was at that time that she came up to me as I’m CLEARLY on all 4s with a flashlight and said “I need to get by”. I said one moment please I’m getting something from under the seat (while my head was literally under the seat). Her reply was “no you need to move now” and proceeded to almost push me out of the way. I looked up and all I saw was her toes under my eyes. When I looked in front of me, her private parts were inches away from my face. I then made a comment “you couldn’t waited 2 seconds?” and her response was, “no I need to use the bathroom”. I understand that and would never want to be the reason someone couldn’t get to the bathroom but I was under the seat. She could’ve gone around the other way instead of harassing me, basically placing her private parts on my head and borderline pushing me out of the way. You don’t pay that much for this deplorable experience. This was by far the worst experience I have ever had on American. I will be absolutely thinking twice and thrice about flying American Airlines again. I would rather pay more to fly delta because at least I know their WiFi will work and their flight attendants won’t have a shitty attitude for no reason, nor will they act the way this woman did. Unacceptable.

Great crew. We were delayed so that late passengers could get on the flight. Love the bedding in business class. Good food. Great experience.

The CX617 from HK to BKK was delayed more than 1.5 hours.

Too bad that first class seats do not recline significantly causing discomfort

The flight was great but board was a nightmare. The gate was changed 4 times during the layover period

The experience was great and much better than the flight going out. of course I was in first class but the service was excellent

American Airlines continues to price it can provide the least comfortable passenger experience in the air. This legacy carrier rivals the budgets for both terrible seats and inadequate amenities. I am a 5’7” woman who is not wider than a coach seat (even on these narrow bodied aircraft). My 3.5 hour flight was terribly uncomfortable because the leg room is inadequate (my knees hit the seat on front of me even when it was not reclined); the seat barely reclines; and the foam padding is worn thin to the extent one can feel the metal supports of the seat. Add to this the fact that the aisle is super narrow, so that the drink cart literally scrapes the arm rest of the aisle seat. It’s basically torture.

Food options were limited which is absolutely embarrassing for a Flight of this size The staff did not come around as much and I am not accustomed to such poor service from American Airlines Drinks I believe were limited to soda and water

Was as expected. Good leg room on planes - much appreciated.

I don’t think the flight attendants are happy. They do not seem to be friendly or welcoming.

Never been on this flight as i had missed it due to delayed connecting flight

Horrible. Delays, no customer support and fake promises and everything. i am suffering to help as due to connecting flight getting missed no support on ground and customer support window is closed and we are sitting o ground without anything

Missed our departing flight due to poor baggage drop staff. At the airport with 2 & 1/2 hours to spare and waited in bag check in until 15 minutes prior to gates closing before baggage staff asked us to move to the front of the line. We weren’t the only passengers that missed the flight. Poor organizational operations by Spirit staff. Otherwise , the return trip was fine.

My experience with Spirit was perfect. Did not expect it to be this good

Worst airline experience ever. Lost my IPad going thru security. Charged for my dog carriage at the gate not at ticket counter. Gave away my seat 6D. Expressed I wanted my seat back after charging me 99 for dog carriage. Should have thrown it out. Had a 16 yr old Yorkie heading to Boston after being a snowbird. Seats small. Very bad experience. Still don’t have my IPad. Horrible

My mother was HARASSED AND ACCOSTED by the gate agent for her bag. I pre purchased the bag fee and the gate agent made my 78 year old mother board, deplane, re pay for her bag fee and board again. The gate agent made my mother pick up her own bag and REFUSED to help her, she is an older woman who wasn’t bothering anyone on a flight that had maybe 30’total passengers. I am going to sue this airlines for their HORRIBLE customer service and treatment of my mother, and all this occurred the day after Mother’s Day!!!

The boarding gate was moved so many times that I missed my flight. No attendants would help me. The wrong gate was even on my boarding pass. I had to repurchase everything. I’ll never fly again. Really a terrible day as I had planned to see a former student who is dying in Louisville Never ever will I forget that day. Your airline is totally uncaring.

Horrible, first flight delayed. They switched my connecting flight while I was en route and even though I was originally supposed to be on the flight going back home to boston, refused to let me board and told me I would have to wait for next flight that was 14 hours later. Ended up renting a car and driving 6.5 hours back home. Still getting messages about flight and it is now showing that the other flight they put me on is now canceled and I would have to wait 24 hours for the next one. I will never book with spirit again

Hated it I would not use Kayak or Spirit ever again.

They stuck us with multiple extra fees. I will never fly spirit again

Book cheap flights from St. Louis to Pennsylvania

Recent round-trip flight deals

7/17Wed
nonstopFrontier
2h 12mSTL-PHL
7/31Wed
nonstopFrontier
2h 24mPHL-STL
$58
7/19Fri
nonstopFrontier
2h 12mSTL-PHL
7/24Wed
nonstopFrontier
2h 24mPHL-STL
$68
6/11Tue
1 stopSpirit Airlines
10h 15mSTL-LGA
6/18Tue
1 stopSpirit Airlines
8h 53mLGA-STL
$104
6/11Tue
1 stopSpirit Airlines
13h 01mSTL-EWR
6/18Tue
1 stopSpirit Airlines
10h 13mEWR-STL
$113
7/17Wed
nonstopAmerican Airlines
2h 15mSTL-PHL
7/17Wed
nonstopAmerican Airlines
2h 41mPHL-STL
$131
6/8Sat
nonstopAmerican Airlines
2h 17mSTL-PHL
6/11Tue
nonstopAmerican Airlines
2h 36mPHL-STL
$134
7/1Mon
1 stopDelta
7h 05mSTL-DCA
7/5Fri
1 stopDelta
6h 44mDCA-STL
$188
7/17Wed
1 stopDelta
6h 27mSTL-PHL
7/23Tue
1 stopDelta
7h 39mPHL-STL
$196
6/26Wed
nonstopUnited Airlines
2h 10mSTL-IAD
7/2Tue
1 stopUnited Airlines
5h 02mIAD-STL
$209
10/16Wed
1 stopUnited Airlines
6h 35mSTL-IAD
10/20Sun
1 stopUnited Airlines
4h 37mIAD-STL
$223

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Recent one-way flight deals

6/28Fri
nonstopFrontier
2h 12mSTL-PHL
$42
6/28Fri
nonstopFrontier
2h 12mSTL-PHL
$43
5/30Thu
1 stopSpirit Airlines
11h 08mSTL-LGA
$49
5/30Thu
1 stopSpirit Airlines
11h 08mSTL-LGA
$54
6/18Tue
nonstopAmerican Airlines
2h 17mSTL-PHL
$66
7/1Mon
1 stopDelta
6h 18mSTL-DCA
$94
6/4Tue
1 stopDelta
3h 41mSTL-IAD
$94
8/17Sat
nonstopAmerican Airlines
1h 59mSTL-DCA
$95
6/12Wed
nonstopUnited Airlines
2h 10mSTL-IAD
$95
6/12Wed
1 stopUnited Airlines
6h 16mSTL-IAD
$104

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Last minute flights from St. Louis to Pennsylvania

Last minute flight, train and bus deals

5/20Mon
multi-stopFrontier
11h 49mSTL-PHL
5/22Wed
nonstopFrontier
2h 27mPHL-STL
$148
5/20Mon
multi-stopFrontier
9h 24mSTL-PHL
5/22Wed
nonstopFrontier
2h 27mPHL-STL
$160
5/21Tue
multi-stopSpirit Airlines
11h 49mSTL-LGA
5/30Thu
multi-stopSpirit Airlines
11h 59mLGA-STL
$187
5/21Tue
multi-stopSpirit Airlines
20h 04mSTL-LGA
5/30Thu
multi-stopSpirit Airlines
11h 59mLGA-STL
$192
5/21Tue
nonstopDelta
2h 32mSTL-LGA
5/30Thu
nonstopDelta
2h 46mLGA-STL
$302
5/21Tue
multi-stopDelta
6h 57mSTL-LGA
5/30Thu
nonstopDelta
2h 56mLGA-STL
$311
5/21Tue
nonstopAmerican Airlines
2h 22mSTL-LGA
5/23Thu
nonstopAmerican Airlines
2h 53mLGA-STL
$331
5/21Tue
multi-stopAmerican Airlines
4h 43mSTL-LGA
5/23Thu
nonstopAmerican Airlines
2h 39mLGA-STL
$339
5/21Tue
multi-stopUnited Airlines
7h 03mSTL-PHL
5/22Wed
multi-stopUnited Airlines
4h 59mPHL-STL
$416
5/20Mon
nonstopUnited Airlines
2h 25mSTL-EWR
5/25Sat
nonstopUnited Airlines
2h 38mEWR-STL
$433

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St. Louis - Pennsylvania Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Pennsylvania - St. Louis

Cabin classes:

$847
$2,784
$1,590
$168