$76+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Apr 17 — Apr 241
Round-trip
1 adult, Economy
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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 March 18, 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 March 18, 2026.
This Expedia deal was found by Cheapflights users on 3/16. 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.
Mon 4/138:19 pm
STL
- PHL
1 stop8h 12m
Frontier
Mon 4/2010:38 pm
PHL
- STL
1 stop25h 41m
Frontier
Deal found 3/16![Frontier logo]()
$180
This Frontier deal was found by Cheapflights users on 3/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/3111:27 am
STL
- EWR
1 stop8h 56m
Frontier
Tue 4/75:59 am
EWR
- STL
1 stop5h 31m
Frontier
Deal found 3/17![Frontier logo]()
$180
This Booking.com deal was found by Cheapflights users on 3/14. 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.
Tue 4/214:59 pm
STL
- EWR
1 stop19h 00m
Frontier
Tue 4/2810:29 pm
EWR
- STL
1 stop9h 21m
Frontier
Deal found 3/14![Frontier logo]()
$182
This Orbitz deal was found by Cheapflights users on 3/17. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/85:27 pm
STL
- EWR
1 stop6h 51m
Frontier
Thu 5/1410:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 3/17![Frontier logo]()
$184
This Mytrip deal was found by Cheapflights users on 3/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/14:54 pm
STL
- EWR
1 stop18h 40m
Frontier
Wed 4/81:30 pm
EWR
- STL
1 stop10h 55m
Frontier
Deal found 3/15![Frontier logo]()
$189
This CheapOair deal was found by Cheapflights users on 3/17. 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 4/88:16 pm
STL
- PHL
1 stop8h 15m
Frontier
Wed 4/158:41 pm
PHL
- STL
1 stop23h 40m
Frontier
Deal found 3/17![Frontier logo]()
$191
This Booking.com deal was found by Cheapflights users on 3/14. 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.
Mon 5/44:59 pm
STL
- EWR
1 stop16h 33m
Frontier
Tue 5/510:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 3/14![Frontier logo]()
$191
This Booking.com deal was found by Cheapflights users on 3/17. 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 5/18:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Fri 5/88:35 pm
PHL
- STL
1 stop23h 48m
Frontier
Deal found 3/17![Frontier logo]()
$193
This Booking.com deal was found by Cheapflights users on 3/17. 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.
Tue 4/214:59 pm
STL
- EWR
1 stop19h 00m
Frontier
Fri 4/241:54 pm
EWR
- STL
1 stop10h 25m
Frontier
Deal found 3/17![Frontier logo]()
$193
This Frontier deal was found by Cheapflights users on 3/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:21 am
STL
- EWR
1 stop9h 08m
Frontier
Thu 5/710:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 3/16![Frontier logo]()
$200
This Frontier deal was found by Cheapflights users on 3/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:21 am
STL
- PHL
1 stop6h 58m
Frontier
Sat 5/24:42 pm
PHL
- STL
1 stop7h 37m
Frontier
Deal found 3/17![Frontier logo]()
$201
This Expedia deal was found by Cheapflights users on 3/14. 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.
Thu 4/96:29 pm
STL
- EWR
1 stop5h 47m
Frontier
Sun 4/121:30 pm
EWR
- STL
1 stop19h 21m
Frontier
Deal found 3/14![Frontier logo]()
$201
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 March 18, 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 March 18, 2026.
This Delta deal was found by Cheapflights users on 3/18. 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 4/96:32 am
STL
- PIT
1 stop5h 55m
Delta
Mon 4/135:25 pm
PIT
- STL
1 stop4h 54m
Delta
Deal found 3/18![Delta logo]()
$237
This Southwest deal was found by Cheapflights users on 3/13. 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 5/610:15 am
STL
- PIT
Nonstop1h 40m
Southwest
Wed 5/136:50 am
PIT
- STL
Nonstop1h 50m
Southwest
Deal found 3/13![Southwest logo]()
$265
This United Airlines deal was found by Cheapflights users on 3/17. 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 4/209:10 am
STL
- IAD
1 stop5h 53m
United Airlines
Thu 4/239:00 am
IAD
- STL
Nonstop2h 28m
United Airlines
Deal found 3/17![United Airlines logo]()
$275
This CheapOair deal was found by Cheapflights users on 3/17. 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 4/34:54 pm
STL
- MDT
1 stop27h 27m
Frontier
Mon 4/610:06 pm
MDT
- STL
1 stop26h 19m
Frontier
Deal found 3/17![Frontier logo]()
$281
This American Airlines deal was found by Cheapflights users on 3/18. 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.
Mon 5/45:21 pm
STL
- MDT
1 stop5h 31m
American Airlines
Thu 5/146:43 pm
MDT
- STL
1 stop6h 13m
American Airlines
Deal found 3/18![American Airlines logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 3/14. 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.
Thu 4/164:59 pm
STL
- ABE
1 stop27h 07m
Multiple Airlines
Tue 4/2112:17 pm
ABE
- STL
1 stop12h 02m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$483
This Southwest deal was found by Cheapflights users on 3/14. 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.
Thu 5/1410:15 am
STL
- PIT
Nonstop1h 40m
Southwest
Sat 5/167:15 am
PIT
- STL
Nonstop1h 50m
Southwest
Deal found 3/14![Southwest logo]()
$265
This Southwest deal was found by Cheapflights users on 3/15. 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 4/256:55 pm
STL
- PIT
Nonstop1h 35m
Southwest
Wed 4/297:10 pm
PIT
- STL
Nonstop1h 50m
Southwest
Deal found 3/15![Southwest logo]()
$265
This Delta deal was found by Cheapflights users on 3/16. 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.
Tue 4/145:27 pm
STL
- LGA
Nonstop2h 33m
Delta
Sun 4/197:38 am
LGA
- STL
Nonstop2h 49m
Delta
Deal found 3/16![Delta logo]()
$295
This United Airlines deal was found by Cheapflights users on 3/17. 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 6/106:00 am
STL
- EWR
Nonstop2h 29m
United Airlines
Mon 6/1510:07 pm
EWR
- STL
Nonstop2h 28m
United Airlines
Deal found 3/17![United Airlines logo]()
$305
This Southwest deal was found by Cheapflights users on 3/13. 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.
Thu 6/47:55 pm
STL
- DCA
Nonstop2h 00m
Southwest
Tue 6/911:45 am
DCA
- STL
1 stop4h 05m
Southwest
Deal found 3/13![Southwest logo]()
$271
This Delta deal was found by Cheapflights users on 3/14. 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 5/77:01 pm
STL
- IAD
1 stop4h 50m
Delta
Mon 5/116:00 am
IAD
- STL
1 stop4h 29m
Delta
Deal found 3/14![Delta logo]()
$305
This United Airlines deal was found by Cheapflights users on 3/13. 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 7/19:23 am
STL
- EWR
1 stop6h 17m
United Airlines
Tue 7/710:07 pm
EWR
- STL
Nonstop2h 29m
United Airlines
Deal found 3/13![United Airlines logo]()
$331
This Southwest deal was found by Cheapflights users on 3/13. 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 5/912:05 pm
STL
- DCA
Nonstop2h 00m
Southwest
Tue 5/126:50 pm
DCA
- STL
1 stop4h 10m
Southwest
Deal found 3/13![Southwest logo]()
$275
This Delta deal was found by Cheapflights users on 3/17. 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 5/146:00 am
STL
- LGA
Nonstop2h 28m
Delta
Sun 5/176:30 am
LGA
- STL
Nonstop2h 43m
Delta
Deal found 3/17![Delta logo]()
$316
This Southwest deal was found by Cheapflights users on 3/14. 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 4/155:15 am
STL
- DCA
1 stop5h 55m
Southwest
Sat 4/188:00 am
DCA
- STL
Nonstop2h 20m
Southwest
Deal found 3/14![Southwest logo]()
$275
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Thu 6/186:00 am
STL
- EWR
Nonstop2h 29m
United Airlines
Mon 6/2210:07 pm
EWR
- STL
Nonstop2h 28m
United Airlines
Deal found 3/15![United Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 3/17. 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 7/3012:00 pm
STL
- LGA
Nonstop2h 31m
Delta
Mon 8/36:59 am
LGA
- STL
Nonstop2h 45m
Delta
Deal found 3/17![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 3/13. 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 4/73:10 pm
STL
- DCA
1 stop6h 35m
Southwest
Sat 4/118:00 am
DCA
- STL
Nonstop2h 20m
Southwest
Deal found 3/13![Southwest logo]()
$275
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Thu 4/166:15 am
STL
- EWR
Nonstop2h 36m
United Airlines
Tue 4/214:50 pm
EWR
- STL
1 stop5h 23m
United Airlines
Deal found 3/15![United Airlines logo]()
$338
This Delta deal was found by Cheapflights users on 3/17. 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 6/104:13 pm
STL
- JFK
Nonstop2h 28m
Delta
Mon 6/153:10 pm
JFK
- STL
Nonstop2h 45m
Delta
Deal found 3/17![Delta logo]()
$325
This American Airlines deal was found by Cheapflights users on 3/18. 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.
Mon 8/175:27 am
STL
- AVP
1 stop5h 06m
American Airlines
Sat 8/225:46 pm
AVP
- STL
1 stop7h 09m
American Airlines
Deal found 3/18![American Airlines logo]()
$483
This Southwest deal was found by Cheapflights users on 3/13. 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.
Thu 5/74:00 pm
STL
- PIT
1 stop6h 10m
Southwest
Thu 5/146:55 am
PIT
- STL
Nonstop1h 50m
Southwest
Deal found 3/13![Southwest logo]()
$275
This Kiwi.com deal was found by Cheapflights users on 3/14. 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.
Thu 4/164:59 pm
STL
- ABE
1 stop27h 07m
Multiple Airlines
Mon 4/206:30 am
ABE
- STL
1 stop17h 49m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$496
This United Airlines deal was found by Cheapflights users on 3/13. 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 4/156:15 am
STL
- EWR
Nonstop2h 36m
United Airlines
Fri 4/173:15 pm
EWR
- STL
1 stop6h 58m
United Airlines
Deal found 3/13![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 3/18. 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 4/2911:42 am
STL
- JFK
1 stop5h 46m
Delta
Sun 5/36:20 am
JFK
- STL
1 stop5h 14m
Delta
Deal found 3/18![Delta logo]()
$325
This Southwest deal was found by Cheapflights users on 3/17. 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 5/1212:40 pm
STL
- DCA
2 stops7h 05m
Southwest
Sat 5/166:00 am
DCA
- STL
1 stop6h 25m
Southwest
Deal found 3/17![Southwest logo]()
$276
This United Airlines deal was found by Cheapflights users on 3/16. 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 4/216:15 am
STL
- EWR
Nonstop2h 36m
United Airlines
Wed 4/229:59 pm
EWR
- STL
Nonstop2h 58m
United Airlines
Deal found 3/16![United Airlines logo]()
$343
This Southwest deal was found by Cheapflights users on 3/15. 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 4/256:55 pm
STL
- PIT
Nonstop1h 35m
Southwest
Tue 4/286:05 am
PIT
- STL
2 stops7h 55m
Southwest
Deal found 3/15![Southwest logo]()
$280
This Delta deal was found by Cheapflights users on 3/14. 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.
Fri 5/157:01 pm
STL
- JFK
1 stop5h 05m
Delta
Mon 5/183:10 pm
JFK
- STL
Nonstop2h 55m
Delta
Deal found 3/14![Delta logo]()
$346
Last-minute flights from St. Louis to PennsylvaniaDiscover last-minute flight deals from St. Louis to Pennsylvania. Data last updated March 18, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Pennsylvania. Data last updated March 18, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 3/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/3111:27 am
STL
- EWR
1 stop8h 56m
Frontier
Tue 4/75:59 am
EWR
- STL
1 stop5h 31m
Frontier
Deal found 3/17![Frontier logo]()
$180
This Expedia deal was found by Cheapflights users on 3/15. 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.
Tue 3/3111:27 am
STL
- EWR
1 stop8h 56m
Frontier
Sun 4/55:59 am
EWR
- STL
1 stop5h 31m
Frontier
Deal found 3/15![Frontier logo]()
$205
This Mytrip deal was found by Cheapflights users on 3/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/14:54 pm
STL
- EWR
1 stop18h 40m
Frontier
Wed 4/81:30 pm
EWR
- STL
1 stop10h 55m
Frontier
Deal found 3/15![Frontier logo]()
$189
This CheapOair deal was found by Cheapflights users on 3/17. 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 4/88:16 pm
STL
- PHL
1 stop8h 15m
Frontier
Wed 4/158:41 pm
PHL
- STL
1 stop23h 40m
Frontier
Deal found 3/17![Frontier logo]()
$191
This Expedia deal was found by Cheapflights users on 3/14. 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.
Thu 4/96:29 pm
STL
- EWR
1 stop5h 47m
Frontier
Sun 4/121:30 pm
EWR
- STL
1 stop19h 21m
Frontier
Deal found 3/14![Frontier logo]()
$201
This Expedia deal was found by Cheapflights users on 3/16. 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.
Mon 4/138:19 pm
STL
- PHL
1 stop8h 12m
Frontier
Mon 4/2010:38 pm
PHL
- STL
1 stop25h 41m
Frontier
Deal found 3/16![Frontier logo]()
$180
This Booking.com deal was found by Cheapflights users on 3/14. 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.
Tue 4/214:59 pm
STL
- EWR
1 stop19h 00m
Frontier
Tue 4/2810:29 pm
EWR
- STL
1 stop9h 21m
Frontier
Deal found 3/14![Frontier logo]()
$182
This Booking.com deal was found by Cheapflights users on 3/17. 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.
Tue 4/214:59 pm
STL
- EWR
1 stop19h 00m
Frontier
Fri 4/241:54 pm
EWR
- STL
1 stop10h 25m
Frontier
Deal found 3/17![Frontier logo]()
$193
This Booking.com deal was found by Cheapflights users on 3/14. 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.
Thu 4/2311:25 am
STL
- PHL
1 stop5h 24m
Frontier
Mon 4/2710:38 pm
PHL
- STL
1 stop25h 41m
Frontier
Deal found 3/14![Frontier logo]()
$207
This Mytrip deal was found by Cheapflights users on 3/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/284:59 pm
STL
- EWR
1 stop19h 00m
Frontier
Tue 5/510:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 3/14![Frontier logo]()
$210
This Frontier deal was found by Cheapflights users on 3/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:21 am
STL
- EWR
1 stop9h 08m
Frontier
Thu 5/710:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 3/16![Frontier logo]()
$200
This Frontier deal was found by Cheapflights users on 3/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:21 am
STL
- PHL
1 stop6h 58m
Frontier
Sat 5/24:42 pm
PHL
- STL
1 stop7h 37m
Frontier
Deal found 3/17![Frontier logo]()
$201
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 March 18, 2026.
Search for one-way flight options from St. Louis to Pennsylvania. Find affordable one-way fares based on user searches. Data last updated March 18, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/18. 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 5/56:41 pm
STL
- IAD
1 stop14h 31m
Frontier
Deal found 3/18![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 3/15. 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 4/278:23 pm
STL
- IAD
1 stop27h 13m
Frontier
Deal found 3/15![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 3/14. 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 5/126:33 pm
STL
- IAD
1 stop27h 36m
Frontier
Deal found 3/14![Frontier logo]()
$89
This Frontier deal was found by Cheapflights users on 3/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:41 pm
STL
- EWR
1 stop5h 37m
Frontier
Deal found 3/16![Frontier logo]()
$89
This Frontier deal was found by Cheapflights users on 3/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/138:19 pm
STL
- PHL
1 stop8h 12m
Frontier
Deal found 3/16![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 3/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/65:27 pm
STL
- IAD
1 stop4h 42m
Frontier
Deal found 3/17![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 3/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/146:55 pm
STL
- EWR
1 stop5h 23m
Frontier
Deal found 3/17![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 3/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/3111:27 am
STL
- PHL
1 stop9h 41m
Frontier
Deal found 3/16![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 3/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/314:51 pm
STL
- IAD
1 stop16h 20m
Frontier
Deal found 3/17![Frontier logo]()
$95
This Booking.com deal was found by Cheapflights users on 3/15. 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.
Mon 5/44:59 pm
STL
- EWR
1 stop16h 33m
Frontier
Deal found 3/15![Frontier logo]()
$95
This Mytrip deal was found by Cheapflights users on 3/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/108:16 pm
STL
- DCA
1 stop24h 43m
Frontier
Deal found 3/18![Frontier logo]()
$96
This Frontier deal was found by Cheapflights users on 3/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/158:23 pm
STL
- PHL
1 stop10h 47m
Frontier
Deal found 3/16![Frontier logo]()
$96
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 March 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $180 (Expedia) |
One-way from | $76 (Kiwi.com) |
Popular in | November |
Cheapest in | August |
Average price | $463 |
Good round-trip deal | $349 or less |
Good one-way deal | $346 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 March 18, 2026.
Use the filters below to find and compare flights from St. Louis to Pennsylvania that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Thu 4/9
6:32 am-1:27 pm
1 stop5h 55m
Pittsburgh
Mon 4/13
5:25 pm-9:19 pm
1 stop4h 54m
$237
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Wed 5/6
10:15 am-12:55 pm
Nonstop1h 40m
Pittsburgh
Wed 5/13
6:50 am-7:40 am
Nonstop1h 50m
$265
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Thu 5/14
10:15 am-12:55 pm
Nonstop1h 40m
Pittsburgh
Sat 5/16
7:15 am-8:05 am
Nonstop1h 50m
$265
Quickest round-trip
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Sat 4/25
6:55 pm-9:30 pm
Nonstop1h 35m
Pittsburgh
Wed 4/29
7:10 pm-8:00 pm
Nonstop1h 50m
$265
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
Thu 6/4
7:55 pm-10:55 pm
Nonstop2h 00m
Washington, D.C. Reagan-National
Tue 6/9
11:45 am-2:50 pm
1 stop4h 05m
$271
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Mon 4/20
9:10 am-4:03 pm
1 stop5h 53m
Washington, D.C. Dulles Intl
Thu 4/23
9:00 am-10:28 am
Nonstop2h 28m
$275
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
Sat 5/9
12:05 pm-3:05 pm
Nonstop2h 00m
Washington, D.C. Reagan-National
Tue 5/12
6:50 pm-10:00 pm
1 stop4h 10m
$275
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
Wed 4/15
5:15 am-12:10 pm
1 stop5h 55m
Washington, D.C. Reagan-National
Sat 4/18
8:00 am-9:20 am
Nonstop2h 20m
$275
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
Tue 4/7
3:10 pm-10:45 pm
1 stop6h 35m
Washington, D.C. Reagan-National
Sat 4/11
8:00 am-9:20 am
Nonstop2h 20m
$275
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Thu 5/7
4:00 pm-11:10 pm
1 stop6h 10m
Pittsburgh
Thu 5/14
6:55 am-7:45 am
Nonstop1h 50m
$275
Showing 1-10 of 60 resultsSorted by cheapest first
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-PHL
STL-EWR
STL-IAD
STL-DCA
STL-PIT
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-PHL
STL-EWR
STL-IAD
STL-DCA
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 March is currently the most expensive (average of $267). 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 March 18, 2026.
It’s optimal to fly from St. Louis to Pennsylvania in the morning. By choosing this option you can save up to 42% 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 March 14, 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. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 March 18, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited 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.
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
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
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St. Louis and Pennsylvania flights
Browse other St. Louis and Pennsylvania flight options. Last updated on March 18, 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 March 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$82 | Average$219 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$142 | Average$235 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$208 | Average$393 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$235 | Average$400 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$365 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$251 | Average$367 | FlexibilityNo cancel fee | On-time69% |