$46+ Cheap flights from St. Louis (STL) to Pennsylvania
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Oct 29 — Nov 51
Round-trip
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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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Pennsylvania
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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 September 29, 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 September 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/212:02 pm -
1 stop10h 03m
Tue 12/86:40 pm -
1 stop17h 37m
Deal found 9/26![Frontier logo]()
$83
This Cheapflightsfares deal was found by Cheapflights users on 9/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:35 pm -
1 stop11h 36m
Wed 10/288:30 am -
1 stop10h 10m
Deal found 9/27![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 9/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:44 pm -
1 stop27h 32m
Tue 12/16:40 pm -
1 stop17h 37m
Deal found 9/26![Frontier logo]()
$117
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:35 pm -
1 stop27h 36m
Wed 10/2812:36 pm -
1 stop6h 04m
Deal found 9/25![Frontier logo]()
$126
This Frontier deal was found by Cheapflights users on 9/24. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:44 pm -
1 stop11h 37m
Mon 11/98:30 am -
1 stop10h 10m
Deal found 9/24![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 9/27. 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 12/912:02 pm -
1 stop10h 03m
Tue 12/154:38 pm -
1 stop19h 39m
Deal found 9/27![Frontier logo]()
$162
This CheapOair deal was found by Cheapflights users on 9/28. 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 12/412:02 pm -
1 stop10h 03m
Tue 12/88:34 am -
1 stop27h 43m
Deal found 9/28![Frontier logo]()
$163
This Cheapflightsfares deal was found by Cheapflights users on 9/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:35 pm -
1 stop11h 36m
Wed 10/2112:35 pm -
1 stop6h 05m
Deal found 9/28![Frontier logo]()
$164
This Southwest deal was found by Cheapflights users on 9/27. 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 10/216:30 pm -
Nonstop1h 40m
Wed 10/286:50 am -
Nonstop1h 55m
Deal found 9/27![Southwest logo]()
$227
This Southwest deal was found by Cheapflights users on 9/26. 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.
Tue 11/1010:15 am -
Nonstop1h 30m
Thu 11/196:50 am -
Nonstop1h 55m
Deal found 9/26![Southwest logo]()
$234
This Southwest deal was found by Cheapflights users on 9/24. 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.
Sat 10/2410:30 am -
Nonstop1h 35m
Sat 10/316:15 am -
Nonstop1h 55m
Deal found 9/24![Southwest logo]()
$241
This Southwest deal was found by Cheapflights users on 9/27. 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 11/1410:35 am -
Nonstop1h 35m
Sun 11/156:35 am -
Nonstop2h 00m
Deal found 9/27![Southwest logo]()
$247
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 September 29, 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 September 29, 2026.
This Southwest deal was found by Cheapflights users on 9/24. 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.
Thu 12/246:15 pm -
Nonstop1h 35m
Tue 12/296:45 am -
Nonstop1h 55m
Deal found 9/24![Southwest logo]()
$241
This American Airlines deal was found by Cheapflights users on 9/24. 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 11/141:20 pm -
1 stop5h 24m
Wed 11/181:06 pm -
1 stop7h 16m
Deal found 9/24![American Airlines logo]()
$247
This United Airlines deal was found by Cheapflights users on 9/28. 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 10/2012:20 pm -
1 stop5h 52m
Wed 10/216:00 pm -
1 stop4h 21m
Deal found 9/28![United Airlines logo]()
$347
This Delta deal was found by Cheapflights users on 9/28. 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 12/196:06 pm -
1 stop4h 09m
Mon 12/286:10 am -
1 stop4h 55m
Deal found 9/28![Delta logo]()
$350
This Southwest deal was found by Cheapflights users on 9/27. 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 11/146:25 am -
1 stop4h 30m
Sun 11/158:15 pm -
Nonstop1h 45m
Deal found 9/27![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 9/25. 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.
Fri 11/133:20 pm -
1 stop6h 50m
Mon 11/166:50 am -
Nonstop1h 55m
Deal found 9/25![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 9/28. 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 12/106:20 pm -
Nonstop2h 05m
Tue 12/152:45 pm -
Nonstop2h 35m
Deal found 9/28![Southwest logo]()
$277
This United Airlines deal was found by Cheapflights users on 9/28. 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 10/137:01 pm -
1 stop4h 30m
Sat 10/179:06 am -
1 stop7h 37m
Deal found 9/28![United Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 9/25. 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.
Thu 12/1010:45 am -
Nonstop2h 15m
Mon 12/146:00 am -
Nonstop2h 45m
Deal found 9/25![Southwest logo]()
$277
This Delta deal was found by Cheapflights users on 9/25. 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 11/132:31 pm -
1 stop6h 56m
Thu 11/196:30 am -
1 stop7h 53m
Deal found 9/25![Delta logo]()
$373
This American Airlines deal was found by Cheapflights users on 9/26. 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 10/95:00 am -
1 stop5h 19m
Mon 10/128:09 pm -
1 stop5h 10m
Deal found 9/26![American Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 9/24. 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.
Sun 11/155:45 am -
1 stop3h 35m
Wed 11/186:50 am -
Nonstop1h 55m
Deal found 9/24![Southwest logo]()
$280
This United Airlines deal was found by Cheapflights users on 9/24. 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.
Wed 1/69:22 am -
1 stop6h 34m
Sat 1/96:17 am -
1 stop6h 56m
Deal found 9/24![United Airlines logo]()
$433
This Southwest deal was found by Cheapflights users on 9/27. 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.
Fri 12/46:20 pm -
Nonstop2h 05m
Mon 12/76:15 pm -
Nonstop2h 30m
Deal found 9/27![Southwest logo]()
$298
This United Airlines deal was found by Cheapflights users on 9/25. 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.
Fri 10/306:50 pm -
1 stop4h 36m
Sat 10/316:05 am -
1 stop5h 27m
Deal found 9/25![United Airlines logo]()
$434
This Southwest deal was found by Cheapflights users on 9/26. 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.
Mon 11/98:10 pm -
Nonstop2h 10m
Tue 12/16:00 am -
Nonstop2h 45m
Deal found 9/26![Southwest logo]()
$298
This Delta deal was found by Cheapflights users on 9/25. 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.
Sun 11/156:00 am -
1 stop5h 04m
Fri 11/276:30 am -
1 stop7h 53m
Deal found 9/25![Delta logo]()
$508
This United Airlines deal was found by Cheapflights users on 9/27. 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 10/219:04 am -
1 stop4h 27m
Sun 10/256:05 am -
1 stop7h 05m
Deal found 9/27![United Airlines logo]()
$434
This Southwest deal was found by Cheapflights users on 9/27. 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.
Fri 10/307:55 pm -
Nonstop1h 40m
Sun 11/17:55 pm -
1 stop3h 50m
Deal found 9/27![Southwest logo]()
$300
This Delta deal was found by Cheapflights users on 9/25. 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.
Sat 11/2110:13 am -
1 stop6h 02m
Fri 11/276:30 am -
1 stop7h 53m
Deal found 9/25![Delta logo]()
$524
This United Airlines deal was found by Cheapflights users on 9/25. 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 10/175:36 pm -
1 stop5h 55m
Sun 10/183:06 pm -
1 stop7h 15m
Deal found 9/25![United Airlines logo]()
$434
This United Airlines deal was found by Cheapflights users on 9/28. 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 12/237:18 am -
1 stop5h 43m
Wed 12/309:47 am -
1 stop5h 31m
Deal found 9/28![United Airlines logo]()
$434
This Southwest deal was found by Cheapflights users on 9/24. 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.
Sat 10/2410:05 am -
2 stops7h 25m
Sat 10/315:35 am -
2 stops9h 10m
Deal found 9/24![Southwest logo]()
$335
This Delta deal was found by Cheapflights users on 9/25. 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 11/136:13 am -
2 stops15h 14m
Mon 11/166:00 pm -
2 stops16h 20m
Deal found 9/25![Delta logo]()
$542
This American Airlines deal was found by Cheapflights users on 9/24. 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 11/2111:24 am -
1 stop7h 01m
Sun 11/297:05 pm -
1 stop5h 51m
Deal found 9/24![American Airlines logo]()
$694
This United Airlines deal was found by Cheapflights users on 9/25. 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.
Sun 10/256:50 pm -
1 stop4h 36m
Sat 10/316:05 am -
1 stop7h 07m
Deal found 9/25![United Airlines logo]()
$434
This Southwest deal was found by Cheapflights users on 9/26. 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.
Sun 11/1510:40 am -
Nonstop2h 10m
Tue 12/16:00 am -
Nonstop2h 45m
Deal found 9/26![Southwest logo]()
$352
This United Airlines deal was found by Cheapflights users on 9/28. 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 10/137:01 pm -
1 stop4h 28m
Sat 10/172:30 pm -
1 stop6h 11m
Deal found 9/28![United Airlines logo]()
$464
This Southwest deal was found by Cheapflights users on 9/27. 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 11/310:45 am -
Nonstop2h 15m
Sun 11/86:00 am -
Nonstop2h 40m
Deal found 9/27![Southwest logo]()
$352
This United Airlines deal was found by Cheapflights users on 9/28. 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 10/139:04 am -
1 stop7h 08m
Sat 10/175:57 pm -
1 stop4h 24m
Deal found 9/28![United Airlines logo]()
$469
Last-minute flights from St. Louis to PennsylvaniaDiscover last-minute flight deals from St. Louis to Pennsylvania. Data last updated September 29, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Pennsylvania. Data last updated September 29, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 9/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:35 pm -
1 stop11h 36m
Wed 10/2112:35 pm -
1 stop6h 05m
Deal found 9/28![Frontier logo]()
$164
This Cheapflightsfares deal was found by Cheapflights users on 9/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:35 pm -
1 stop11h 36m
Wed 10/288:30 am -
1 stop10h 10m
Deal found 9/27![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 9/24. 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.
Wed 10/216:35 pm -
1 stop11h 36m
Thu 10/226:03 pm -
1 stop24h 37m
Deal found 9/24![Frontier logo]()
$176
This Southwest deal was found by Cheapflights users on 9/27. 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 10/216:30 pm -
Nonstop1h 40m
Wed 10/286:50 am -
Nonstop1h 55m
Deal found 9/27![Southwest logo]()
$227
This American Airlines deal was found by Cheapflights users on 9/28. 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 10/227:29 am -
1 stop6h 38m
Mon 10/268:36 pm -
1 stop4h 43m
Deal found 9/28![American Airlines logo]()
$247
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:35 pm -
1 stop27h 36m
Wed 10/2812:36 pm -
1 stop6h 04m
Deal found 9/25![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:35 pm -
1 stop27h 36m
Fri 10/3012:35 pm -
1 stop6h 05m
Deal found 9/25![Frontier logo]()
$195
This Southwest deal was found by Cheapflights users on 9/28. 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.
Fri 10/237:55 pm -
Nonstop1h 40m
Mon 10/266:40 pm -
1 stop6h 10m
Deal found 9/28![Southwest logo]()
$257
This Southwest deal was found by Cheapflights users on 9/28. 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.
Fri 10/237:55 pm -
Nonstop1h 40m
Sun 10/256:45 am -
Nonstop1h 55m
Deal found 9/28![Southwest logo]()
$267
This Southwest deal was found by Cheapflights users on 9/24. 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.
Sat 10/2410:30 am -
Nonstop1h 35m
Sat 10/316:15 am -
Nonstop1h 55m
Deal found 9/24![Southwest logo]()
$241
This American Airlines deal was found by Cheapflights users on 9/24. 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 10/2411:21 am -
1 stop4h 34m
Sat 10/311:03 pm -
1 stop4h 48m
Deal found 9/24![American Airlines logo]()
$261
This American Airlines deal was found by Cheapflights users on 9/24. 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.
Mon 10/265:27 pm -
1 stop4h 47m
Mon 11/26:37 pm -
1 stop6h 22m
Deal found 9/24![American Airlines logo]()
$297
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 September 29, 2026.
Search for one-way flight options from St. Louis to Pennsylvania. Find affordable one-way fares based on user searches. Data last updated September 29, 2026.
This Trip.com deal was found by Cheapflights users on 9/26. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:35 pm -
1 stop22h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$46
This Kiwi.com deal was found by Cheapflights users on 9/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:35 pm -
1 stop11h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$47
This Kiwi.com deal was found by Cheapflights users on 9/28. 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 10/306:44 pm -
1 stop11h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$54
This Kiwi.com deal was found by Cheapflights users on 9/28. 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 11/306:35 pm -
1 stop25h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$59
This Kiwi.com deal was found by Cheapflights users on 9/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:35 pm -
1 stop17h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 9/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:35 pm -
1 stop27h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 9/27. 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 10/286:44 pm -
1 stop28h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$70
This CheapOair deal was found by Cheapflights users on 9/27. 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.
Mon 10/264:30 pm -
1 stop24h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$112
This Southwest deal was found by Cheapflights users on 9/28. 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 11/127:55 pm -
Nonstop1h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Southwest logo]()
$114
This Southwest deal was found by Cheapflights users on 9/29. 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 11/237:55 pm -
Nonstop1h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Southwest logo]()
$121
This American Airlines deal was found by Cheapflights users on 9/24. 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.
Mon 11/911:35 am -
1 stop7h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![American Airlines logo]()
$123
This Delta deal was found by Cheapflights users on 9/29. 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 10/2710:35 am -
1 stop3h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Delta logo]()
$124
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 September 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $83 (Kiwi.com) |
One-way from | $46 (Trip.com) |
Popular in | November |
Cheapest in | September |
Average price | $378 |
Good round-trip deal | $247 or less |
Good one-way deal | $103 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 7,457,451 searches. Data last updated September 29, 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 Lambert-St Louis - PIT Pittsburgh
STLPIT
Lambert-St Louis
Thu 11/12
7:55 pm-10:35 pm
Nonstop1h 40m
Pittsburgh
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$114
St. LouisPittsburgh
STL Lambert-St Louis - PIT Pittsburgh
STLPIT
Lambert-St Louis
Mon 11/23
7:55 pm-10:35 pm
Nonstop1h 40m
Pittsburgh
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$121
St. LouisPittsburgh
STL Lambert-St Louis - PIT Pittsburgh
STLPIT
Lambert-St Louis
Tue 10/27
10:35 am-3:18 pm
1 stop3h 43m
Pittsburgh
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$124
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Wed 10/28
6:40 pm-9:50 pm
Nonstop2h 10m
Philadelphia
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$139
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Wed 12/16
10:45 am-2:00 pm
Nonstop2h 15m
Philadelphia
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$139
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Sat 12/12
10:35 am-1:45 pm
Nonstop2h 10m
Philadelphia
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$139
St. LouisPittsburgh
STL Lambert-St Louis - PIT Pittsburgh
STLPIT
Lambert-St Louis
Fri 10/30
7:20 pm-12:36 am
1 stop4h 16m
Pittsburgh
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$144
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Sat 10/24
10:47 am-4:51 pm
1 stop5h 04m
Philadelphia
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$149
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Tue 10/27
10:14 am-4:51 pm
1 stop5h 37m
Philadelphia
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$149
St. LouisPhiladelphia
STL Lambert-St Louis - PHL Philadelphia
STLPHL
Lambert-St Louis
Thu 12/17
10:06 am-4:14 pm
1 stop5h 08m
Philadelphia
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$149
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-PIT
STL-AVP
STL-MDT
STL-LNS
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-PIT
STL-AVP
STL-MDT
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 $369). Flying from St. Louis to Pennsylvania in November is currently the most expensive (average of $454). 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 September 29, 2026.
It’s optimal to fly from St. Louis to Pennsylvania in the afternoon. By choosing this option you can save up to 39% 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 September 29, 2026.
The most flights from STL to USPA are scheduled on a Monday (13 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (1 on average).
How much does it cost to fly round-trip from St. Louis to Pennsylvania?
Airfare is below average for this route at the moment.
St. Louis to Pennsylvania flights typically cost between $316 and $481 in December.The cheapest round-trip price found within the last 5 days was $83 on Frontier (Dec 2-Dec 8).
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 66 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 September 26, 2026.
Travelers seeking maximum savings on their St. Louis to Pennsylvania flight should consider departing on Thursday afternoons when fares are most often at their lowest. Monday evenings 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 September 29, 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.
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Boarding
8.1
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
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 September 29, 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 7,457,451 searches. Data last updated September 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$262 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$168 | Average$380 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$196 | Average$462 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$233 | Average$410 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$250 | Average$398 | FlexibilityNo cancel fee | On-timeN/A |