$86+ 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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Jul 26 — Aug 21
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 June 26, 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 June 26, 2026.
This United Airlines deal was found by Cheapflights users on 6/24. 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 8/258:00 am
STL
- PIT
1 stop4h 15m
United Airlines
Wed 8/266:09 pm
PIT
- STL
1 stop4h 51m
United Airlines
Deal found 6/24![United Airlines logo]()
$196
This American Airlines deal was found by Cheapflights users on 6/24. 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.
Sat 9/127:27 am
STL
- PIT
1 stop4h 05m
American Airlines
Sat 9/198:47 pm
PIT
- STL
1 stop4h 40m
American Airlines
Deal found 6/24![American Airlines logo]()
$201
This Frontier deal was found by Cheapflights users on 6/23. 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 9/2210:35 am
STL
- EWR
1 stop9h 53m
Frontier
Tue 9/2910:29 pm
EWR
- STL
1 stop12h 11m
Frontier
Deal found 6/23![Frontier logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 8/144:57 pm
STL
- EWR
1 stop7h 06m
Frontier
Wed 8/1910:29 pm
EWR
- STL
1 stop19h 53m
Frontier
Deal found 6/22![Frontier logo]()
$218
This Southwest deal was found by Cheapflights users on 6/23. 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 7/157:10 pm
STL
- PIT
Nonstop1h 40m
Southwest
Tue 7/217:45 pm
PIT
- STL
Nonstop1h 45m
Southwest
Deal found 6/23![Southwest logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/134:57 pm
STL
- EWR
1 stop27h 31m
Frontier
Tue 7/2110:29 pm
EWR
- STL
1 stop11h 28m
Frontier
Deal found 6/22![Frontier logo]()
$222
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/146:34 pm
STL
- EWR
1 stop25h 54m
Frontier
Tue 7/215:55 am
EWR
- STL
1 stop12h 42m
Frontier
Deal found 6/22![Frontier logo]()
$223
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 8/116:34 pm
STL
- EWR
1 stop5h 29m
Frontier
Sat 8/1510:29 pm
EWR
- STL
1 stop20h 08m
Frontier
Deal found 6/23![Frontier logo]()
$227
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 9/1010:35 am
STL
- EWR
1 stop13h 24m
Frontier
Tue 9/1510:29 pm
EWR
- STL
1 stop12h 11m
Frontier
Deal found 6/22![Frontier logo]()
$228
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 9/1910:35 am
STL
- EWR
1 stop9h 53m
Frontier
Fri 9/2510:29 pm
EWR
- STL
1 stop12h 11m
Frontier
Deal found 6/22![Frontier logo]()
$229
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 9/1810:35 am
STL
- EWR
1 stop9h 53m
Frontier
Mon 9/2110:29 pm
EWR
- STL
1 stop12h 11m
Frontier
Deal found 6/22![Frontier logo]()
$232
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 8/14:57 pm
STL
- EWR
1 stop7h 06m
Frontier
Mon 8/1010:29 pm
EWR
- STL
1 stop20h 08m
Frontier
Deal found 6/22![Frontier logo]()
$234
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 June 26, 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 June 26, 2026.
This United Airlines deal was found by Cheapflights users on 6/24. 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 8/258:00 am
STL
- PIT
1 stop4h 15m
United Airlines
Wed 8/266:09 pm
PIT
- STL
1 stop4h 51m
United Airlines
Deal found 6/24![United Airlines logo]()
$196
This Southwest deal was found by Cheapflights users on 6/24. 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 8/2510:25 am
STL
- PIT
Nonstop1h 40m
Southwest
Wed 8/266:40 am
PIT
- STL
Nonstop1h 40m
Southwest
Deal found 6/24![Southwest logo]()
$219
This Delta deal was found by Cheapflights users on 6/24. 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 7/2810:51 am
STL
- PIT
1 stop3h 59m
Delta
Mon 8/35:50 am
PIT
- STL
1 stop5h 04m
Delta
Deal found 6/24![Delta logo]()
$266
This American Airlines deal was found by Cheapflights users on 6/22. 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 8/174:54 pm
STL
- AVP
1 stop6h 03m
American Airlines
Sat 8/226:03 am
AVP
- STL
1 stop7h 52m
American Airlines
Deal found 6/22![American Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 6/23. 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 7/157:10 pm
STL
- PIT
Nonstop1h 40m
Southwest
Tue 7/217:45 pm
PIT
- STL
Nonstop1h 45m
Southwest
Deal found 6/23![Southwest logo]()
$219
This Southwest deal was found by Cheapflights users on 6/22. 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 10/1510:25 am
STL
- PIT
Nonstop1h 35m
Southwest
Mon 10/198:15 pm
PIT
- STL
Nonstop1h 45m
Southwest
Deal found 6/22![Southwest logo]()
$245
This United Airlines deal was found by Cheapflights users on 6/24. 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.
Sat 8/228:00 am
STL
- IAD
1 stop4h 55m
United Airlines
Sat 8/298:25 am
IAD
- STL
Nonstop2h 14m
United Airlines
Deal found 6/24![United Airlines logo]()
$274
This Delta deal was found by Cheapflights users on 6/25. 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 11/174:40 pm
STL
- ABE
1 stop5h 06m
Delta
Sun 11/226:30 am
ABE
- STL
1 stop5h 18m
Delta
Deal found 6/25![Delta logo]()
$299
This United Airlines deal was found by Cheapflights users on 6/23. 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 8/188:00 am
STL
- PIT
1 stop4h 15m
United Airlines
Wed 8/196:09 pm
PIT
- STL
1 stop4h 51m
United Airlines
Deal found 6/23![United Airlines logo]()
$276
This American Airlines deal was found by Cheapflights users on 6/21. 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 7/35:48 pm
STL
- MDT
1 stop4h 22m
American Airlines
Fri 7/107:38 pm
MDT
- STL
1 stop4h 54m
American Airlines
Deal found 6/21![American Airlines logo]()
$315
This Southwest deal was found by Cheapflights users on 6/26. 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 8/89:00 am
STL
- DCA
2 stops8h 40m
Southwest
Mon 8/106:50 am
DCA
- STL
1 stop7h 15m
Southwest
Deal found 6/26![Southwest logo]()
$270
This Delta deal was found by Cheapflights users on 6/25. 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 8/2111:00 am
STL
- ABE
1 stop5h 19m
Delta
Tue 8/256:16 am
ABE
- STL
1 stop6h 30m
Delta
Deal found 6/25![Delta logo]()
$299
This American Airlines deal was found by Cheapflights users on 6/23. 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.
Thu 7/99:08 am
STL
- MDT
1 stop6h 12m
American Airlines
Thu 7/237:45 pm
MDT
- STL
1 stop5h 31m
American Airlines
Deal found 6/23![American Airlines logo]()
$324
This United Airlines deal was found by Cheapflights users on 6/25. 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 8/118:40 am
STL
- IAD
Nonstop2h 17m
United Airlines
Fri 8/218:20 am
IAD
- STL
1 stop4h 42m
United Airlines
Deal found 6/25![United Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 6/25. 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 9/265:45 am
STL
- PIT
1 stop3h 25m
Southwest
Sun 9/276:55 am
PIT
- STL
Nonstop1h 45m
Southwest
Deal found 6/25![Southwest logo]()
$271
This Delta deal was found by Cheapflights users on 6/26. 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 11/174:40 pm
STL
- ABE
1 stop5h 06m
Delta
Sat 11/216:30 am
ABE
- STL
1 stop7h 26m
Delta
Deal found 6/26![Delta logo]()
$299
This Delta deal was found by Cheapflights users on 6/25. 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 11/184:40 pm
STL
- ABE
1 stop5h 06m
Delta
Sun 11/226:30 am
ABE
- STL
1 stop5h 18m
Delta
Deal found 6/25![Delta logo]()
$299
This Southwest deal was found by Cheapflights users on 6/22. 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 7/283:15 pm
STL
- PIT
2 stops6h 15m
Southwest
Thu 7/305:45 am
PIT
- STL
1 stop6h 05m
Southwest
Deal found 6/22![Southwest logo]()
$276
This Delta deal was found by Cheapflights users on 6/23. 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 7/283:58 pm
STL
- LGA
1 stop5h 29m
Delta
Tue 8/46:30 am
LGA
- STL
Nonstop2h 38m
Delta
Deal found 6/23![Delta logo]()
$303
This Southwest deal was found by Cheapflights users on 6/25. 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 7/283:15 pm
STL
- PIT
2 stops6h 15m
Southwest
Mon 8/38:15 pm
PIT
- STL
1 stop3h 40m
Southwest
Deal found 6/25![Southwest logo]()
$276
This American Airlines deal was found by Cheapflights users on 6/26. 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 7/35:48 pm
STL
- MDT
1 stop4h 22m
American Airlines
Mon 7/67:45 pm
MDT
- STL
1 stop5h 31m
American Airlines
Deal found 6/26![American Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 6/21. 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.
Sat 12/1211:51 am
STL
- JFK
1 stop7h 16m
Delta
Tue 12/153:10 pm
JFK
- STL
Nonstop2h 56m
Delta
Deal found 6/21![Delta logo]()
$303
This United Airlines deal was found by Cheapflights users on 6/25. 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.
Sat 7/48:00 am
STL
- MDT
1 stop4h 34m
United Airlines
Sat 7/116:30 am
MDT
- STL
1 stop5h 04m
United Airlines
Deal found 6/25![United Airlines logo]()
$368
This Southwest deal was found by Cheapflights users on 6/21. 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 8/1510:15 am
STL
- PHL
Nonstop2h 10m
Southwest
Mon 8/175:55 am
PHL
- STL
1 stop5h 15m
Southwest
Deal found 6/21![Southwest logo]()
$285
This Delta deal was found by Cheapflights users on 6/24. 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.
Sat 11/74:13 pm
STL
- JFK
Nonstop2h 39m
Delta
Sat 11/145:00 pm
JFK
- STL
1 stop7h 39m
Delta
Deal found 6/24![Delta logo]()
$303
This United Airlines deal was found by Cheapflights users on 6/24. 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.
Sat 8/16:01 am
STL
- EWR
Nonstop2h 29m
United Airlines
Sat 8/810:17 pm
EWR
- STL
Nonstop2h 27m
United Airlines
Deal found 6/24![United Airlines logo]()
$373
This Southwest deal was found by Cheapflights users on 6/24. 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 8/123:45 pm
STL
- PHL
1 stop4h 10m
Southwest
Mon 8/176:20 am
PHL
- STL
Nonstop2h 15m
Southwest
Deal found 6/24![Southwest logo]()
$285
This United Airlines deal was found by Cheapflights users on 6/22. 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 8/187:00 am
STL
- EWR
Nonstop2h 31m
United Airlines
Wed 8/199:59 pm
EWR
- STL
Nonstop2h 39m
United Airlines
Deal found 6/22![United Airlines logo]()
$373
This Delta deal was found by Cheapflights users on 6/25. 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 9/101:01 pm
STL
- LGA
Nonstop2h 29m
Delta
Mon 9/146:30 am
LGA
- STL
Nonstop2h 36m
Delta
Deal found 6/25![Delta logo]()
$321
This Southwest deal was found by Cheapflights users on 6/25. 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 8/117:10 pm
STL
- DCA
Nonstop2h 00m
Southwest
Fri 8/211:00 pm
DCA
- STL
1 stop4h 20m
Southwest
Deal found 6/25![Southwest logo]()
$297
Last-minute flights from St. Louis to PennsylvaniaDiscover last-minute flight deals from St. Louis to Pennsylvania. Data last updated June 26, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Pennsylvania. Data last updated June 26, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 6/22. 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 7/84:57 pm
STL
- EWR
1 stop7h 06m
Frontier
Tue 7/215:55 am
EWR
- STL
1 stop12h 42m
Frontier
Deal found 6/22![Frontier logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/114:57 pm
STL
- EWR
1 stop7h 06m
Frontier
Tue 7/2110:29 pm
EWR
- STL
1 stop11h 28m
Frontier
Deal found 6/22![Frontier logo]()
$240
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/134:57 pm
STL
- EWR
1 stop27h 31m
Frontier
Thu 7/1610:29 pm
EWR
- STL
1 stop11h 28m
Frontier
Deal found 6/22![Frontier logo]()
$222
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/134:57 pm
STL
- EWR
1 stop27h 31m
Frontier
Thu 7/2310:29 pm
EWR
- STL
1 stop11h 28m
Frontier
Deal found 6/22![Frontier logo]()
$238
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/134:57 pm
STL
- EWR
1 stop27h 31m
Frontier
Sat 7/2510:29 pm
EWR
- STL
1 stop20h 08m
Frontier
Deal found 6/22![Frontier logo]()
$251
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/146:34 pm
STL
- EWR
1 stop25h 54m
Frontier
Thu 7/1610:29 pm
EWR
- STL
1 stop11h 28m
Frontier
Deal found 6/22![Frontier logo]()
$223
This Southwest deal was found by Cheapflights users on 6/23. 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 7/157:10 pm
STL
- PIT
Nonstop1h 40m
Southwest
Tue 7/217:45 pm
PIT
- STL
Nonstop1h 45m
Southwest
Deal found 6/23![Southwest logo]()
$219
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/154:57 pm
STL
- EWR
1 stop7h 06m
Frontier
Thu 7/235:55 am
EWR
- STL
1 stop12h 42m
Frontier
Deal found 6/22![Frontier logo]()
$239
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 7/204:57 pm
STL
- EWR
1 stop7h 06m
Frontier
Tue 7/2110:29 pm
EWR
- STL
1 stop11h 28m
Frontier
Deal found 6/23![Frontier logo]()
$235
This Frontier deal was found by Cheapflights users on 6/22. 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 7/216:34 pm
STL
- EWR
1 stop5h 29m
Frontier
Thu 7/2310:29 pm
EWR
- STL
1 stop11h 28m
Frontier
Deal found 6/22![Frontier logo]()
$249
This Mytrip deal was found by Cheapflights users on 6/22. 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 7/244:09 pm
STL
- PIT
1 stop25h 06m
Frontier
Mon 7/277:13 pm
PIT
- STL
1 stop5h 46m
Frontier
Deal found 6/22![Frontier logo]()
$252
This Booking.com deal was found by Cheapflights users on 6/22. 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 7/284:09 pm
STL
- PIT
1 stop18h 55m
Frontier
Thu 7/307:13 pm
PIT
- STL
1 stop5h 46m
Frontier
Deal found 6/22![Frontier logo]()
$247
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 June 26, 2026.
Search for one-way flight options from St. Louis to Pennsylvania. Find affordable one-way fares based on user searches. Data last updated June 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/21. 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 7/146:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/21![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/134:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/22![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/216:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 6/24![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 7/174:57 pm
STL
- IAD
1 stop22h 37m
Frontier
Deal found 6/22![Frontier logo]()
$88
This Trip.com deal was found by Cheapflights users on 6/24. 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 9/1610:35 am
STL
- PHL
1 stop11h 36m
Frontier
Deal found 6/24![Frontier logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 9/1810:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 6/23![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 9/1710:35 am
STL
- PHL
1 stop6h 40m
Frontier
Deal found 6/24![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 7/184:57 pm
STL
- PHL
1 stop13h 18m
Frontier
Deal found 6/24![Frontier logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/166:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/24![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 7/166:34 pm
STL
- PHL
1 stop11h 41m
Frontier
Deal found 6/24![Frontier logo]()
$96
This United Airlines deal was found by Cheapflights users on 6/21. 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 8/198:00 am
STL
- PIT
1 stop4h 15m
United Airlines
Deal found 6/21![United Airlines logo]()
$96
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/206:17 pm
STL
- PHL
1 stop11h 58m
Frontier
Deal found 6/24![Frontier logo]()
$98
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 June 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $196 (United Airlines) |
One-way from | $86 (Kiwi.com) |
Popular in | November |
Cheapest in | August |
Average price | $446 |
Good round-trip deal | $280 or less |
Good one-way deal | $207 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 June 26, 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
Tue 8/25
8:00 am-1:15 pm
1 stop4h 15m
Pittsburgh
Wed 8/26
6:09 pm-10:00 pm
1 stop4h 51m
$196
Quickest round-trip
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Tue 8/25
10:25 am-1:05 pm
Nonstop1h 40m
Pittsburgh
Wed 8/26
6:40 am-7:20 am
Nonstop1h 40m
$219
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Wed 7/15
7:10 pm-9:50 pm
Nonstop1h 40m
Pittsburgh
Tue 7/21
7:45 pm-8:30 pm
Nonstop1h 45m
$219
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Thu 10/15
10:25 am-1:00 pm
Nonstop1h 35m
Pittsburgh
Mon 10/19
8:15 pm-9:00 pm
Nonstop1h 45m
$245
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Tue 7/28
10:51 am-3:50 pm
1 stop3h 59m
Pittsburgh
Mon 8/3
5:50 am-9:54 am
1 stop5h 04m
$266
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
Sat 8/8
9:00 am-6:40 pm
2 stops8h 40m
Washington, D.C. Reagan-National
Mon 8/10
6:50 am-1:05 pm
1 stop7h 15m
$270
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Sat 9/26
5:45 am-10:10 am
1 stop3h 25m
Pittsburgh
Sun 9/27
6:55 am-7:40 am
Nonstop1h 45m
$271
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Sat 8/22
8:00 am-1:55 pm
1 stop4h 55m
Washington, D.C. Dulles Intl
Sat 8/29
8:25 am-9:39 am
Nonstop2h 14m
$274
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Tue 8/18
8:00 am-1:15 pm
1 stop4h 15m
Pittsburgh
Wed 8/19
6:09 pm-10:00 pm
1 stop4h 51m
$276
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Tue 7/28
3:15 pm-10:30 pm
2 stops6h 15m
Pittsburgh
Thu 7/30
5:45 am-10:50 am
1 stop6h 05m
$276
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-PIT
STL-EWR
STL-PHL
STL-MDT
STL-AVP
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-PIT
STL-EWR
STL-PHL
STL-MDT
What is the cheapest month to book a flight from St. Louis to Pennsylvania?
Currently, October is the cheapest month in which you can book a flight from St. Louis to Pennsylvania (average of $76). Flying from St. Louis to Pennsylvania in July is currently the most expensive (average of $205). 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 June 26, 2026.
It’s optimal to fly from St. Louis to Pennsylvania in the morning. By choosing this option you can save up to 38% on the cost of your flight, compared to a flight at noon.
Weekly flight availability from St. Louis to Pennsylvania
Explore weekly flight availability from St. Louis to Pennsylvania. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 26, 2026.
The most flights from STL to USPA are scheduled on a Monday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from St. Louis to Pennsylvania?
How far ahead should I book a flight from St. Louis to Pennsylvania?
To ensure you get the cheapest price possible for a flight from St. Louis to Pennsylvania, you should look to book at least 83 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
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 June 20, 2026.
Travelers seeking maximum savings on their St. Louis to Pennsylvania flight should consider departing on Tuesday evenings when fares are most often at their lowest. Tuesday at noon 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 June 26, 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.
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.5
Comfort
8.0
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
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 June 26, 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 5 airlines flying from St. Louis to Pennsylvania
Discover the top 5 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 June 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$142 | Average$248 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$168 | Average$369 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$204 | Average$362 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$227 | Average$410 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$379 | FlexibilityNo cancel fee | On-timeN/A |