$60+ Cheap flights from St. Louis (STL) to Pennsylvania
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Mar 14 — Mar 211
1 adult, Economy
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Find cheap flights from St. Louis to Pennsylvania with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from St. Louis to PennsylvaniaExplore the most affordable flight options available from St. Louis to Pennsylvania. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 12, 2026.
Explore the most affordable flight options available from St. Louis to Pennsylvania. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1111:32 am
STL
- EWR
1 stop8h 58m
Multiple Airlines
Wed 3/185:50 am
EWR
- STL
1 stop5h 47m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1111:32 am
STL
- EWR
1 stop12h 31m
Frontier
Tue 3/1710:30 pm
EWR
- STL
1 stop13h 07m
Frontier
Deal found 2/11![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/92:09 pm
STL
- EWR
1 stop8h 20m
Multiple Airlines
Mon 3/166:00 am
EWR
- STL
1 stop8h 34m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
- EWR
1 stop10h 59m
Frontier
Mon 3/96:00 am
EWR
- STL
1 stop8h 19m
Frontier
Deal found 2/9![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- EWR
1 stop20h 22m
Multiple Airlines
Fri 3/66:00 am
EWR
- STL
1 stop6h 49m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/2312:16 pm
STL
- EWR
1 stop11h 47m
Multiple Airlines
Tue 3/245:50 am
EWR
- STL
1 stop5h 42m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
- EWR
1 stop10h 59m
Frontier
Sun 3/1510:30 pm
EWR
- STL
1 stop16h 04m
Frontier
Deal found 2/10![Frontier logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:17 pm
STL
- EWR
1 stop10h 48m
Multiple Airlines
Fri 2/275:55 am
EWR
- STL
1 stop25h 56m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/28:22 pm
STL
- EWR
1 stop10h 43m
Multiple Airlines
Wed 3/410:30 pm
EWR
- STL
1 stop26h 29m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:17 pm
STL
- EWR
1 stop10h 48m
Multiple Airlines
Thu 2/2610:31 pm
EWR
- STL
1 stop9h 20m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/238:22 pm
STL
- EWR
1 stop10h 43m
Multiple Airlines
Fri 2/275:55 am
EWR
- STL
1 stop25h 56m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/92:09 pm
STL
- PHL
1 stop9h 43m
Frontier
Mon 3/165:05 am
PHL
- STL
1 stop9h 29m
Frontier
Deal found 2/9![Frontier logo]()
$151
Best flights from St. Louis to PennsylvaniaDiscover carefully curated flight deals from St. Louis to Pennsylvania that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 12, 2026.
Discover carefully curated flight deals from St. Louis to Pennsylvania that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 12, 2026.
This Expedia deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/108:41 am
STL
- MDT
1 stop11h 40m
Frontier
Sun 4/1210:06 pm
MDT
- STL
1 stop10h 45m
Frontier
Deal found 2/10![Frontier logo]()
$160
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/266:00 am
STL
- PIT
1 stop5h 37m
Delta
Thu 4/27:35 pm
PIT
- STL
1 stop5h 23m
Delta
Deal found 2/9![Delta logo]()
$197
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/259:23 am
STL
- PIT
1 stop6h 42m
United Airlines
Mon 6/16:11 pm
PIT
- STL
1 stop4h 00m
United Airlines
Deal found 2/10![United Airlines logo]()
$197
This American Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:55 pm
STL
- PIT
1 stop4h 28m
American Airlines
Sat 4/253:30 pm
PIT
- STL
1 stop5h 00m
American Airlines
Deal found 2/11![American Airlines logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- EWR
2 stops15h 16m
Multiple Airlines
Thu 3/56:00 pm
EWR
- STL
1 stop18h 49m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$206
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:00 am
STL
- LGA
Nonstop2h 20m
Southwest
Tue 4/143:05 pm
LGA
- STL
Nonstop2h 55m
Southwest
Deal found 2/11![Southwest logo]()
$266
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/115:59 pm
STL
- PIT
1 stop3h 47m
Delta
Wed 3/1810:26 am
PIT
- STL
1 stop3h 32m
Delta
Deal found 2/9![Delta logo]()
$197
This United Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:45 am
STL
- PIT
1 stop6h 41m
United Airlines
Sat 4/257:00 am
PIT
- STL
1 stop4h 45m
United Airlines
Deal found 2/11![United Airlines logo]()
$197
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:06 am
STL
- PIT
1 stop5h 53m
American Airlines
Thu 3/58:59 am
PIT
- STL
1 stop6h 57m
American Airlines
Deal found 2/10![American Airlines logo]()
$205
This Lucky2Go deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lucky2Go is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/53:49 pm
STL
- PHL
1 stop14h 43m
Frontier
Mon 3/95:05 am
PHL
- STL
1 stop9h 14m
Frontier
Deal found 2/10![Frontier logo]()
$214
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/115:59 pm
STL
- PIT
1 stop3h 47m
Delta
Mon 3/1610:26 am
PIT
- STL
1 stop3h 32m
Delta
Deal found 2/9![Delta logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/1312:16 pm
STL
- EWR
1 stop10h 13m
Multiple Airlines
Mon 3/166:00 am
EWR
- STL
1 stop8h 34m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$221
This United Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/117:40 am
STL
- PIT
1 stop4h 29m
United Airlines
Wed 3/185:48 pm
PIT
- STL
1 stop4h 19m
United Airlines
Deal found 2/11![United Airlines logo]()
$201
This Booking.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/138:12 pm
STL
- PHL
1 stop8h 19m
Frontier
Wed 3/185:05 am
PHL
- STL
1 stop6h 32m
Frontier
Deal found 2/11![Frontier logo]()
$217
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/107:40 am
STL
- PIT
1 stop4h 29m
United Airlines
Tue 3/172:05 pm
PIT
- STL
1 stop4h 55m
United Airlines
Deal found 2/9![United Airlines logo]()
$201
This Delta deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/235:59 pm
STL
- PIT
1 stop3h 47m
Delta
Tue 3/3110:26 am
PIT
- STL
1 stop3h 32m
Delta
Deal found 2/11![Delta logo]()
$207
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/167:35 pm
STL
- DCA
Nonstop1h 55m
Southwest
Tue 3/173:25 pm
DCA
- STL
Nonstop2h 35m
Southwest
Deal found 2/10![Southwest logo]()
$274
This CheapOair deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/254:51 pm
STL
- MDT
1 stop27h 37m
Frontier
Sat 3/2810:18 pm
MDT
- STL
1 stop9h 39m
Frontier
Deal found 2/10![Frontier logo]()
$227
This Delta deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/16:45 am
STL
- PIT
1 stop3h 26m
Delta
Mon 7/67:55 pm
PIT
- STL
1 stop4h 43m
Delta
Deal found 2/10![Delta logo]()
$207
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/252:00 pm
STL
- MDT
1 stop7h 14m
American Airlines
Sun 3/16:00 am
MDT
- STL
1 stop5h 03m
American Airlines
Deal found 2/10![American Airlines logo]()
$269
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/184:00 pm
STL
- DCA
1 stop6h 15m
Southwest
Wed 3/2511:40 am
DCA
- STL
2 stops7h 15m
Southwest
Deal found 2/11![Southwest logo]()
$282
This American Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:36 pm
STL
- MDT
1 stop4h 14m
American Airlines
Sun 3/16:00 am
MDT
- STL
1 stop5h 03m
American Airlines
Deal found 2/9![American Airlines logo]()
$269
This CheapOair deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/273:49 pm
STL
- MDT
1 stop25h 37m
Frontier
Mon 3/210:46 am
MDT
- STL
1 stop14h 13m
Frontier
Deal found 2/9![Frontier logo]()
$255
This Southwest deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/87:35 pm
STL
- LGA
Nonstop2h 25m
Southwest
Mon 4/1312:00 pm
LGA
- STL
Nonstop2h 50m
Southwest
Deal found 2/12![Southwest logo]()
$282
This United Airlines deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/249:10 am
STL
- MDT
1 stop6h 36m
United Airlines
Sat 5/25:49 pm
MDT
- STL
1 stop4h 19m
United Airlines
Deal found 2/11![United Airlines logo]()
$260
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/84:51 pm
STL
- PHL
1 stop29h 25m
Multiple Airlines
Tue 3/106:26 pm
PHL
- STL
2 stops17h 11m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$318
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/186:00 am
STL
- DCA
1 stop5h 54m
American Airlines
Mon 3/237:30 am
DCA
- STL
Nonstop2h 36m
American Airlines
Deal found 2/10![American Airlines logo]()
$273
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:55 am
STL
- LGA
Nonstop2h 20m
Southwest
Thu 4/303:00 pm
LGA
- STL
Nonstop2h 50m
Southwest
Deal found 2/11![Southwest logo]()
$282
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/19:10 am
STL
- EWR
1 stop6h 20m
United Airlines
Sat 4/49:59 pm
EWR
- STL
Nonstop2h 58m
United Airlines
Deal found 2/9![United Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/259:15 am
STL
- MDT
1 stop5h 58m
American Airlines
Sat 3/2812:30 pm
MDT
- STL
1 stop9h 41m
American Airlines
Deal found 2/8![American Airlines logo]()
$274
Last-minute flights from St. Louis to PennsylvaniaDiscover last-minute flight deals from St. Louis to Pennsylvania. Data last updated February 12, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Pennsylvania. Data last updated February 12, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/238:22 pm
STL
- EWR
1 stop10h 43m
Multiple Airlines
Fri 2/275:55 am
EWR
- STL
1 stop25h 56m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:17 pm
STL
- EWR
1 stop10h 48m
Multiple Airlines
Fri 2/275:55 am
EWR
- STL
1 stop25h 56m
Multiple Airlines
Deal found 2/11![Multiple Airlines logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:17 pm
STL
- EWR
1 stop10h 48m
Multiple Airlines
Thu 2/2610:31 pm
EWR
- STL
1 stop9h 20m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/28:22 pm
STL
- EWR
1 stop10h 43m
Multiple Airlines
Wed 3/410:30 pm
EWR
- STL
1 stop26h 29m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- EWR
1 stop20h 22m
Multiple Airlines
Fri 3/66:00 am
EWR
- STL
1 stop6h 49m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
- EWR
1 stop10h 59m
Frontier
Mon 3/96:00 am
EWR
- STL
1 stop8h 19m
Frontier
Deal found 2/9![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
- EWR
1 stop10h 59m
Frontier
Sun 3/1510:30 pm
EWR
- STL
1 stop16h 04m
Frontier
Deal found 2/10![Frontier logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/92:09 pm
STL
- EWR
1 stop8h 20m
Multiple Airlines
Mon 3/166:00 am
EWR
- STL
1 stop8h 34m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/92:09 pm
STL
- PHL
1 stop9h 43m
Frontier
Mon 3/165:05 am
PHL
- STL
1 stop9h 29m
Frontier
Deal found 2/9![Frontier logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1111:32 am
STL
- EWR
1 stop8h 58m
Multiple Airlines
Wed 3/185:50 am
EWR
- STL
1 stop5h 47m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1111:32 am
STL
- EWR
1 stop12h 31m
Frontier
Tue 3/1710:30 pm
EWR
- STL
1 stop13h 07m
Frontier
Deal found 2/11![Frontier logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/2312:16 pm
STL
- EWR
1 stop11h 47m
Multiple Airlines
Tue 3/245:50 am
EWR
- STL
1 stop5h 42m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$135
One-way flights from St. Louis to PennsylvaniaSearch for one-way flight options from St. Louis to Pennsylvania. Find affordable one-way fares based on user searches. Data last updated February 12, 2026.
Search for one-way flight options from St. Louis to Pennsylvania. Find affordable one-way fares based on user searches. Data last updated February 12, 2026.
This Trip.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/92:09 pm
STL
- EWR
1 stop9h 54m
Frontier
Deal found 2/12![Frontier logo]()
$60
This Trip.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1811:32 am
STL
- EWR
1 stop8h 58m
Frontier
Deal found 2/12![Frontier logo]()
$61
This Trip.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1811:32 am
STL
- IAD
1 stop11h 49m
Frontier
Deal found 2/9![Frontier logo]()
$62
This Trip.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/61:09 pm
STL
- EWR
1 stop10h 59m
Frontier
Deal found 2/10![Frontier logo]()
$62
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/28:22 pm
STL
- EWR
1 stop10h 43m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/98:12 pm
STL
- PHL
1 stop8h 22m
Frontier
Deal found 2/9![Frontier logo]()
$65
This Trip.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/711:21 am
STL
- IAD
1 stop12h 15m
Frontier
Deal found 2/12![Frontier logo]()
$65
This Trip.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/2312:16 pm
STL
- EWR
1 stop8h 14m
Frontier
Deal found 2/9![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/33:49 pm
STL
- EWR
1 stop28h 41m
Frontier
Deal found 2/10![Frontier logo]()
$68
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/258:17 pm
STL
- EWR
1 stop27h 51m
Frontier
Deal found 2/9![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/298:13 pm
STL
- EWR
1 stop28h 03m
Frontier
Deal found 2/11![Frontier logo]()
$71
This Kiwi.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:13 pm
STL
- EWR
1 stop10h 59m
Multiple Airlines
Deal found 2/12![Multiple Airlines logo]()
$72
Find flight deals from St. Louis to Pennsylvania
Keep the following information in mind while searching for St. Louis to Pennsylvania flight deals. Data was last updated February 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $126 (Kiwi.com) |
One-way from | $60 (Trip.com) |
Popular in | November |
Cheapest in | August |
Average price | $483 |
Good round-trip deal | $289 or less |
Good one-way deal | $250 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Pennsylvania that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 12, 2026.
Use the filters below to find and compare flights from St. Louis to Pennsylvania that are best for you.
Fly from
St. Louis
Fly to
Pennsylvania
Route
Depart
Return
Price
St. LouisHarrisburg
STL - MDT
STLMDT
Lambert-St Louis
Fri 4/10
8:41 am-9:21 pm
1 stop11h 40m
Harrisburg
Sun 4/12
10:06 pm-7:51 am
1 stop10h 45m
$160
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Thu 3/26
6:00 am-12:37 pm
1 stop5h 37m
Pittsburgh
Thu 4/2
7:35 pm-11:58 pm
1 stop5h 23m
$197
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Mon 5/25
9:23 am-5:05 pm
1 stop6h 42m
Pittsburgh
Mon 6/1
6:11 pm-9:11 pm
1 stop4h 00m
$197
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Wed 4/22
6:55 pm-12:23 am
1 stop4h 28m
Pittsburgh
Sat 4/25
3:30 pm-7:30 pm
1 stop5h 00m
$197
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Wed 3/11
5:59 pm-10:46 pm
1 stop3h 47m
Pittsburgh
Wed 3/18
10:26 am-12:58 pm
1 stop3h 32m
$197
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Wed 4/22
7:45 am-3:26 pm
1 stop6h 41m
Pittsburgh
Sat 4/25
7:00 am-10:45 am
1 stop4h 45m
$197
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Wed 3/11
5:59 pm-10:46 pm
1 stop3h 47m
Pittsburgh
Mon 3/16
10:26 am-12:58 pm
1 stop3h 32m
$197
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Wed 3/11
7:40 am-1:09 pm
1 stop4h 29m
Pittsburgh
Wed 3/18
5:48 pm-9:07 pm
1 stop4h 19m
$201
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Tue 3/10
7:40 am-1:09 pm
1 stop4h 29m
Pittsburgh
Tue 3/17
2:05 pm-6:00 pm
1 stop4h 55m
$201
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Tue 3/3
6:06 am-12:59 pm
1 stop5h 53m
Pittsburgh
Thu 3/5
8:59 am-2:56 pm
1 stop6h 57m
$205
Showing 1-10 of 60 results
Best time to book a flight from St. Louis to Pennsylvania
Have a flexible travel schedule? Discover the best time to fly to Pennsylvania from St. Louis with our price prediction graph.
STL-EWR
STL-PHL
STL-MDT
STL-PIT
STL-LGA
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Pennsylvania
STL-USPA
STL-EWR
STL-PHL
STL-MDT
STL-PIT
What is the cheapest month to book a flight from St. Louis to Pennsylvania?
Currently, January is the cheapest month in which you can book a flight from St. Louis to Pennsylvania (average of $140). Flying from St. Louis to Pennsylvania in June is currently the most expensive (average of $244). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from STL to PA?
Find hourly flight availability from St. Louis to Pennsylvania. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 12, 2026.
It’s optimal to fly from St. Louis to Pennsylvania in the morning. By choosing this option you can save up to 43% on the cost of your flight, compared to a flight at noon.
What is the cheapest day to fly from St. Louis to Pennsylvania?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to Pennsylvania. Price data was last updated on February 7, 2026.
Travelers seeking maximum savings on their St. Louis to Pennsylvania flight should consider departing on Tuesday at noon when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
How much does it cost to fly round-trip from St. Louis to Pennsylvania?
Reviews of airlines servicing Pennsylvania
Get insights into the airlines that provide service to Pennsylvania. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Pennsylvania. Reviews last updated February 12, 2026.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from St. Louis to Pennsylvania by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Pennsylvania. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for St. Louis to Pennsylvania
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Complete your trip
Complete your trip to Pennsylvania by adding a car rental and/or hotel reservation to your travel itinerary.
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Find flights from St. Louis to Pennsylvania, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Pennsylvania flights
Browse other St. Louis and Pennsylvania flight options. Last updated on February 12, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
St. Louis to Pennsylvania flights
Consider these flights traveling from St. Louis to Pennsylvania.
Top 6 airlines flying from St. Louis to Pennsylvania
Discover the top 6 airlines that operate flights from St. Louis to Pennsylvania. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$82 | Average$219 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$133 | Average$235 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$208 | Average$392 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$241 | Average$394 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$346 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$251 | Average$339 | FlexibilityNo cancel fee | On-time69% |