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Find cheap flights from St. Louis to Pennsylvania from $39

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 6/22. 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
Thu 5/30
Thu 6/6

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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$67
Pittsburgh
Pittsburgh1 stop$187
Harrisburg
Harrisburg1 stop$198
Allentown
Allentown1 stop$216
Scranton
Scranton1 stop$280
State College
State College1 stop$458
New York
New York1 stop$140

Good to know

Low season

January

High season

June

Cheapest flight

$39
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly with an average 3% increase in price.
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: Philadelphia $159 one-way - $350 round-trip
  • Morning departure is around 2% more expensive 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 10895 reviews
8.0Entertainment
8.6Crew
7.9Comfort
7.4Food
8.2Boarding
Airline reviews

Delayed due to an ill passenger after loading. Not preventable on Delta's part. Was in first class. The seats are becoming worn and detaching from their velcro attachments. Only got snacks on flight. The attendant was not the friendliest.

6.0 GoodJames, Apr 2024TPA - RDU
Read more about Delta reviews

Delayed due to an ill passenger after loading. Not preventable on Delta's part. Was in first class. The seats are becoming worn and detaching from their velcro attachments. Only got snacks on flight. The attendant was not the friendliest.

I would fly again the whole experience was great. The only feed back I can give that they don't do that American Airlines does is the crew there is more humorous with boarding and thank their passengers. It makes it more fun to fly with them. I would however fly Delta again.

From Atlanta to Cabo I would have hoped on a plane that size I would have been able to breathe and wiggle my feet a little! The leg room in that plane is non existent and I am only 5”4’. And the air vent either wasn’t working very well or just could not blow air from the ceiling to the seat area as I was suffocating through the entire flight! And please don’t say I would have been more comfortable in first class because I cannot afford those rates and have always travelled Main Cabin without issues !

The pilots were good. Disappointing when planes don't have electrical ports

I liked the piloting of the aircraft. Very disappointed about lack of electrical ports. Also, although a short flight. there was enough time to hand out snacks to comfort + seats as was done for first class.

I had a wonderful experience flying with delta. The gentleman taking care of us on our flight was so nice, accommodating, and attentive. He always was smiling and giving pins to the kids which made me smile. The flight was quick too and without turbulence. Thank you for the great flying experience.

Delta is one of the best airlines I have flown

Made the Atlanta to Pittsburgh trip many times, with Delta no issues

I always fly with Delta. My friends tell me their horror stories of flying with other airlines. I just smile and say, “You should fly Delta”

I'm a larger, athletic guy (6'2", 260lbs powerlifter) and I found the seats incredibly uncomfortable with minimal leg room, especially in a window seat. Now, I full understand that being smaller may change my view but even if I was 80lbs less, my legs would be the same size and I was sandwiched between my seat and the seat in front of me.

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.

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

All flights were on time and boarding was issue free

Terrible! The plane was old and you are required to connect your own device to their Wi-Fi rather than have entertainment options in the back of the seat in front of you. The Wi-Fi went out during the flight and there was only one plug for the devices every two seats. Three out of five surrounding my family did not work. The seats and spaces under them were so small I could not fit my backpack, which I’ve always brought on flights and fit before no problem. The crew were unpleasant and patronizing.

Great! The plane was decently sized and comfortable. The staff was nice and there was great in flight entertainment

Water service would be great. The way they board is terrible. Slow passengers first😂😂 They need to smart up a bit

Our original business class flight was cancelled so we not only downgraded but we were also spread out across the plane not sitting together in separate middle seats. My poor kids were scared and couldn’t see me on the flight and the crew wasn’t sensitive to the situation and what the airlines did to us. Very dissatisfied with United airlines.

Crew were fine, drinks and snacks were as well but we were delayed for around 2 hrs which made our entry into Mexico delayed as well with the influx of arrivals at the same time. Sort of wasted our first day of vacation. We left Pittsburgh at 630am and did not arrive in Mexico until late dinner time.

There was a group of school age passengers that were very loud and unruly with their chaperones were no where to be found.

Boarding was unorganized. They expected passengers to ask people to move their assigned seat they paid for in order to sit together. The seats even in comfort are smaller than other airlines and the flight attendants appeared not to be well prepared

The WiFi didn’t work and the seats are too close together. Very uncomfortable.

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.

Smaller, regional aircraft limits amount of overhead luggage space. At least there were jetways at both BNA and PHL. First class food service was minimal with the usual assortment of packaged snacks (nothing creative) and no handiwipes. American tries to turn around aircraft too quickly without enough time to clean the planes. WIFI service did not include TV programming.

6 plus hour delay with no explanation. No wheelchairs to transport us on arrival. Very disappointed.

Food choice is limited, entertainment better than average, seat leg room terrible

The guy with severe body odor sat next to me. For the whole duration of the flight it was a torture. The airline should have better policy on limiting people with bad body odor to board the flight. Passengers should not be the ones to endure bad odor for the whole duration of the flight. The airline should be e the one to ensure decent air quality for ever passenger.

Overall it was a miserable experience... I will never fly spirit for more than a 3 hour flight or overnight.

The boarding attendant was slightly rude when I asked about checking our stroller. Made me feel like I was bothering her.

My wife and I are both handicapped and at boarding they upgraded us to a seat closer to the front rather than all the way towards the back. Much appreciated.

Not much seat room, but that was unexpected. But the seat headrest was very uncomfortable.

First the good, everyone was friendly and efficient. Flight was smooth and plane was very clean and new. Now the bad, seats have almost no padding on your behind. I was in exit row so I had tons of leg room for a 6' 2" bean pole with long legs. Everything was extra - water, soda, snacks everything besides oxygen. Ya get what you pay for, and my flight was cheap as you could ever want it, so no worries.

First the good, everyone was friendly and efficient. Flight was smooth and plane was very clean and new. Now the bad, seats have almost no padding on your behind. I was in exit row so I had tons of leg room for a 6' 2" bean pole with long legs. Everything was extra - water, soda, snacks everything besides oxygen. Ya get what you pay for, and my flight was cheap as you could ever want it, so no worries. They dont really bother you about carry-on size, I brought a descent sized backpack and they didnt even check.

Spirit canceled the flight in March and never notified me!

Seats suck, not enough room, overcrowded planes, hectic situation all together.

Pretty good. Would’ve been excellent if we would have left on time and the crew wasn’t late.

Book cheap flights from St. Louis to Pennsylvania

Recent round-trip flight deals

5/29Wed
nonstopFrontier
2h 14mSTL-PHL
6/5Wed
nonstopFrontier
2h 27mPHL-STL
$67
5/29Wed
nonstopFrontier
2h 14mSTL-PHL
6/29Sat
nonstopFrontier
2h 27mPHL-STL
$68
5/21Tue
1 stopSpirit Airlines
21h 26mSTL-PHL
5/22Wed
1 stopSpirit Airlines
25h 05mPHL-STL
$127
5/21Tue
1 stopSpirit Airlines
21h 26mSTL-PHL
5/25Sat
1 stopSpirit Airlines
22h 32mPHL-STL
$128
5/28Tue
nonstopAmerican Airlines
2h 10mSTL-PHL
6/4Tue
nonstopAmerican Airlines
2h 44mPHL-STL
$169
5/29Wed
1 stopDelta
5h 23mSTL-PHL
6/29Sat
1 stopDelta
4h 40mPHL-STL
$196
9/7Sat
1 stopDelta
5h 37mSTL-MDT
9/11Wed
1 stopDelta
6h 30mMDT-STL
$198
8/6Tue
1 stopAmerican Airlines
7h 51mSTL-PIT
8/10Sat
1 stopAmerican Airlines
10h 12mPIT-STL
$202
5/24Fri
1 stopUnited Airlines
6h 54mSTL-MDT
5/27Mon
1 stopUnited Airlines
7h 29mMDT-STL
$298
9/11Wed
1 stopUnited Airlines
4h 07mSTL-PIT
9/11Wed
2 stopsUnited Airlines
14h 57mPIT-STL
$447

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Recent one-way flight deals

6/22Sat
nonstopFrontier
2h 14mSTL-PHL
$39
6/19Wed
nonstopFrontier
2h 14mSTL-PHL
$49
5/7Tue
1 stopSpirit Airlines
21h 26mSTL-PHL
$55
5/28Tue
1 stopSpirit Airlines
21h 26mSTL-PHL
$64
5/28Tue
nonstopAmerican Airlines
2h 10mSTL-PHL
$85
9/11Wed
1 stopAmerican Airlines
7h 12mSTL-PIT
$97
8/3Sat
1 stopDelta
6h 11mSTL-PHL
$98
5/28Tue
1 stopDelta
7h 22mSTL-PIT
$137
9/11Wed
2 stopsUnited Airlines
11h 03mSTL-PIT
$254
8/3Sat
2 stopsUnited Airlines
12h 16mSTL-PHL
$329

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Last minute flights from St. Louis to Pennsylvania

Last minute flight, train and bus deals

5/2Thu
multi-stopFrontier
17h 07mSTL-PHL
5/7Tue
multi-stopFrontier
28h 23mPHL-STL
$247
5/4Sat
multi-stopFrontier
8h 41mSTL-PHL
5/8Wed
multi-stopFrontier
13h 08mPHL-STL
$248
5/2Thu
multi-stopSpirit Airlines
21h 33mSTL-PHL
5/7Tue
multi-stopSpirit Airlines
19h 46mPHL-STL
$275
5/3Fri
multi-stopAmerican Airlines
5h 31mSTL-MDT
5/6Mon
multi-stopAmerican Airlines
4h 20mMDT-STL
$294
5/2Thu
multi-stopAmerican Airlines
4h 57mSTL-MDT
5/4Sat
multi-stopAmerican Airlines
5h 20mMDT-STL
$308
5/2Thu
multi-stopSpirit Airlines
24h 20mSTL-PHL
5/7Tue
multi-stopSpirit Airlines
19h 46mPHL-STL
$322
5/2Thu
multi-stopDelta
4h 26mSTL-MDT
5/4Sat
multi-stopDelta
11h 44mMDT-STL
$399
5/2Thu
multi-stopDelta
11h 09mSTL-MDT
5/4Sat
multi-stopDelta
11h 44mMDT-STL
$488
5/3Fri
multi-stopUnited Airlines
5h 49mSTL-MDT
5/6Mon
multi-stopUnited Airlines
20h 01mMDT-STL
$504
5/1Wed
multi-stopUnited Airlines
4h 49mSTL-MDT
5/3Fri
multi-stopUnited Airlines
16h 15mMDT-STL
$585

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St. Louis - Pennsylvania Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Pennsylvania - St. Louis

Cabin classes:

$864
$1,166
$1,788
$168