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Find cheap flights from St. Louis to Pennsylvania from $38

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 6/18. 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
Mon 7/8
Mon 7/15

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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$159
Harrisburg
Harrisburg1 stop$223
Allentown
Allentown1 stop$248
Scranton
Scranton1 stop$342
State College
State College1 stop$608
Williamsport
Williamsport3 stops$1,067
New York
Newark1 stop$124

Good to know

Low season

January

High season

June

Cheapest flight

$38
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly and prices are also 12% lower on average.
Flight from St. Louis to Newark Liberty Airport

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. $138 one-way - $253 round-trip; New York $175 one-way - $272 round-trip; Philadelphia $110 one-way - $271 round-trip
  • Morning departure is around 14% 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 10310 reviews
8.0Entertainment
7.4Food
8.2Boarding
7.9Comfort
8.6Crew
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!

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.

Not worth the price of premium class ticket paid, felt more like steerage.

Flighty delayed on boarding - then group 1 had to check their carry on bags but groups 3 and beyond could carry bags on - very inconvenient for weekend business trip with no checked baggage. Then delayed on the runway - before take off. No communication from pilot on why or how long. Wifi/Entertainment didn't work for 4+ flight. Upon arrival, attendants announced wrong carousel for baggage claim - everyone was waiting at the wrong place for their checked bags. This was a mess united!

I had a great flight. Everything went smoothly and the flight arrived early.

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

The boarding process and flight were great. However, I waited about 40 minutes for my luggage. It did not come up on the designated belt. Instead, everyone’s bags were on a cart. Not sure what the issue was, but we were not informed until another passenger went looking for her bags and found them.

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

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

We can’t predict circumstances like this ahead of time, but I give your staff a hats off for immediately giving us updated informations.

It was nice! There was a very unhappy child in front of us and the flight attendant did a great job calming the child. I was impressed.

The plane was not on time for boarding or departure or arrivals.

EVERYTHING WAS WONDERFUL HOSPITALITY THE HELP.THE SEATING FRIENDLY ALWAYS HAVE A GOOD RIDE NOT ONE BAD EXPERIENCE WITH THEM

8 hr delay. had to buy another ticket with another airline

Four and a half hour delay in total. What frustrates me most is the poor communication and disorganization.

I appreciated the upgrade to free cary-on bag and seat selection at no charge

FRONTIER SUCKS! The agent downstairs tricked me into booking, just to get to the gate. At the gate, they told me they couldn't help. I then called Customer Service. They and the gate attendants kept blaming each other. Neither side was willing to help the customer.

The agent at check-in was strident, unwelcoming, and condescending to customers ahead of me.

Flight was delay 9hrs and nothing was provided at airport, had to go and get a room to sleep in, paid for Uber back and fort with no offers until we landed back home a 1hr later for a $75 voucher for a future flight.

Didn't like anything..entire crew was very rude to everyone on the flight. Plane old and the trays fall down on you the while time you're flying. Charged more for a carry on bag than for the plane ticket itself. Did make it from point a to point b, but worth the extra money to fly with another airline

9 hours of delay!! Was not able to check my luggage that I paid for!!!

It was delayed 9 hours for operational reasons, despite the plane arriving to the airport on time.

I am very disappointed with Frontier Airlines. They cancelled our flight because they couldn't find a crew member, and then didn't get us to our connecting flight. We had to cancel our whole vacation. We were promised flight and hotel vouchers, but they never sent them.

Book cheap flights from St. Louis to Pennsylvania

Recent round-trip flight deals

7/10Wed
nonstopFrontier
2h 12mSTL-PHL
7/17Wed
nonstopFrontier
2h 24mPHL-STL
$58
8/9Fri
nonstopFrontier
2h 12mSTL-PHL
8/12Mon
nonstopFrontier
2h 24mPHL-STL
$59
9/14Sat
1 stopSpirit Airlines
7h 12mSTL-PHL
9/17Tue
1 stopSpirit Airlines
11h 10mPHL-STL
$107
9/10Tue
1 stopSpirit Airlines
14h 42mSTL-EWR
9/24Tue
1 stopSpirit Airlines
8h 20mEWR-STL
$124
7/10Wed
nonstopAmerican Airlines
2h 15mSTL-PHL
7/10Wed
nonstopAmerican Airlines
2h 37mPHL-STL
$126
6/27Thu
nonstopAmerican Airlines
2h 17mSTL-PHL
7/4Thu
nonstopAmerican Airlines
2h 33mPHL-STL
$131
7/1Mon
1 stopDelta
4h 46mSTL-DCA
7/5Fri
1 stopDelta
6h 44mDCA-STL
$188
7/1Mon
1 stopDelta
6h 57mSTL-IAD
7/5Fri
1 stopDelta
4h 05mIAD-STL
$188
8/24Sat
nonstopUnited Airlines
2h 08mSTL-IAD
8/28Wed
1 stopUnited Airlines
6h 52mIAD-STL
$199
8/24Sat
1 stopUnited Airlines
5h 55mSTL-IAD
8/28Wed
1 stopUnited Airlines
6h 29mIAD-STL
$204

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Recent one-way flight deals

6/18Tue
1 stopSpirit Airlines
8h 11mSTL-EWR
$38
6/21Fri
nonstopFrontier
2h 12mSTL-PHL
$39
6/26Wed
nonstopAmerican Airlines
2h 17mSTL-PHL
$66
7/1Mon
nonstopAmerican Airlines
2h 01mSTL-DCA
$85
7/1Mon
1 stopDelta
6h 46mSTL-DCA
$94
6/20Thu
1 stopUnited Airlines
4h 53mSTL-PHL
$95
6/20Thu
1 stopDelta
6h 12mSTL-PHL
$98
8/26Mon
nonstopUnited Airlines
2h 08mSTL-IAD
$105
7/1Mon
2 stopsQatar Airways
38h 18mSTL-IAD
$2,003
7/27Sat
2 stopsQatar Airways
43h 20mSTL-IAD
$2,067

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Last minute flights from St. Louis to Pennsylvania

Last minute flight, train and bus deals

6/10Mon
nonstopFrontier
2h 12mSTL-PHL
6/15Sat
nonstopFrontier
2h 27mPHL-STL
$98
6/12Wed
multi-stopFrontier
8h 31mSTL-PHL
6/15Sat
nonstopFrontier
2h 27mPHL-STL
$125
6/12Wed
nonstopAmerican Airlines
2h 17mSTL-PHL
6/15Sat
nonstopAmerican Airlines
2h 27mPHL-STL
$221
6/12Wed
multi-stopAmerican Airlines
4h 47mSTL-PHL
6/15Sat
nonstopAmerican Airlines
2h 27mPHL-STL
$231
6/12Wed
multi-stopDelta
6h 12mSTL-PHL
6/15Sat
multi-stopDelta
7h 16mPHL-STL
$243
6/13Thu
multi-stopDelta
4h 31mSTL-PHL
6/16Sun
multi-stopDelta
4h 15mPHL-STL
$265
6/11Tue
multi-stopUnited Airlines
4h 53mSTL-PHL
6/12Wed
multi-stopUnited Airlines
7h 13mPHL-STL
$286
6/13Thu
multi-stopSpirit Airlines
10h 26mSTL-LGA
8/9Fri
multi-stopSpirit Airlines
14h 05mLGA-STL
$313
6/11Tue
multi-stopSpirit Airlines
10h 15mSTL-LGA
6/18Tue
multi-stopSpirit Airlines
5h 57mLGA-STL
$315
6/13Thu
nonstopUnited Airlines
2h 22mSTL-EWR
8/9Fri
nonstopUnited Airlines
2h 38mEWR-STL
$362

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St. Louis - Pennsylvania Flights

Departure:

St. Louis (STL)United States

Return flight deals:

Pennsylvania - St. Louis

Cabin classes:

$846
$1,196
$1,662
$73