$43+ Cheap flights from Pennsylvania to St. Louis (STL)
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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
Oct 30 — Nov 61
Round-trip
1 adult, Economy
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Find cheap flights from Pennsylvania to St. Louis 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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
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 Pennsylvania to St. Louis
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Cheapest flights from Pennsylvania to St. LouisExplore the most affordable flight options available from Pennsylvania to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 30, 2026.
Explore the most affordable flight options available from Pennsylvania to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 30, 2026.
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/227:51 pm -
1 stop28h 22m
Mon 10/264:30 pm -
1 stop24h 02m
Deal found 9/27![Frontier logo]()
$223
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 10/226:50 am -
Nonstop1h 55m
Mon 10/267:55 pm -
Nonstop1h 40m
Deal found 9/28![Southwest logo]()
$227
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.
Tue 12/16:50 am -
Nonstop1h 55m
Mon 12/76:15 pm -
Nonstop1h 35m
Deal found 9/29![Southwest logo]()
$241
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.
Wed 10/215:40 am -
2 stops5h 40m
Wed 10/216:30 pm -
Nonstop1h 40m
Deal found 9/28![Southwest logo]()
$242
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.
Wed 10/287:15 pm -
Nonstop1h 45m
Sun 11/110:15 am -
Nonstop1h 35m
Deal found 9/29![Southwest logo]()
$247
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.
Tue 11/34:00 pm -
1 stop7h 10m
Fri 11/610:15 am -
Nonstop1h 35m
Deal found 9/25![Southwest logo]()
$257
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 11/912:30 pm -
2 stops9h 30m
Tue 11/106:35 am -
1 stop4h 10m
Deal found 9/29![Southwest logo]()
$258
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/15:05 pm -
1 stop5h 26m
Mon 12/76:02 am -
1 stop5h 26m
Deal found 9/29![American Airlines logo]()
$261
This Southwest deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/226:25 am -
Nonstop2h 20m
Mon 10/2610:40 am -
Nonstop2h 15m
Deal found 9/30![Southwest logo]()
$277
This American Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/228:56 am -
Nonstop2h 45m
Mon 10/2611:21 am -
Nonstop2h 19m
Deal found 9/30![American Airlines logo]()
$278
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 11/256:50 am -
1 stop11h 50m
Tue 12/16:13 pm -
2 stops27h 52m
Deal found 9/26![Frontier logo]()
$279
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.
Sun 10/410:10 am -
1 stop7h 24m
Wed 10/286:44 pm -
1 stop11h 27m
Deal found 9/26![Frontier logo]()
$282
Best flights from Pennsylvania to St. LouisDiscover carefully curated flight deals from Pennsylvania to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 30, 2026.
Discover carefully curated flight deals from Pennsylvania to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 30, 2026.
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 11/128:15 pm -
Nonstop1h 45m
Sat 11/1410:35 am -
Nonstop1h 35m
Deal found 9/25![Southwest logo]()
$227
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/175:15 am -
1 stop7h 00m
Mon 11/237:13 am -
1 stop4h 54m
Deal found 9/27![Delta logo]()
$297
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.
Fri 11/136:37 pm -
1 stop6h 22m
Mon 11/1611:35 am -
1 stop5h 28m
Deal found 9/28![American Airlines logo]()
$318
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 10/142:30 pm -
1 stop5h 31m
Wed 10/286:50 pm -
1 stop4h 52m
Deal found 9/28![United Airlines logo]()
$323
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.
Thu 10/226:50 am -
Nonstop1h 55m
Mon 10/267:55 pm -
Nonstop1h 40m
Deal found 9/27![Southwest logo]()
$227
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.
Sun 11/15:10 am -
1 stop6h 00m
Wed 11/46:15 pm -
Nonstop1h 40m
Deal found 9/29![Southwest logo]()
$257
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.
Tue 11/37:13 am -
1 stop4h 38m
Sat 11/72:25 pm -
1 stop6h 40m
Deal found 9/25![Delta logo]()
$297
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 11/36:30 pm -
Nonstop1h 55m
Fri 11/64:40 pm -
2 stops6h 15m
Deal found 9/26![Southwest logo]()
$262
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:08 am -
1 stop5h 42m
Fri 10/305:00 am -
1 stop5h 17m
Deal found 9/25![American Airlines logo]()
$339
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 10/132:30 pm -
1 stop5h 31m
Sat 10/175:36 pm -
1 stop5h 53m
Deal found 9/28![United Airlines logo]()
$364
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.
Mon 10/267:54 pm -
1 stop5h 00m
Thu 10/297:20 pm -
1 stop4h 16m
Deal found 9/25![Delta logo]()
$333
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 12/56:15 am -
Nonstop2h 40m
Mon 12/710:45 am -
Nonstop2h 15m
Deal found 9/27![Southwest logo]()
$277
This American Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 11/146:15 pm -
1 stop6h 44m
Mon 11/165:29 pm -
1 stop4h 30m
Deal found 9/30![American Airlines logo]()
$342
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.
Tue 11/102:45 pm -
Nonstop2h 35m
Thu 11/1210:40 am -
Nonstop2h 10m
Deal found 9/25![Southwest logo]()
$277
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/101:56 pm -
1 stop6h 04m
Wed 10/148:30 am -
1 stop4h 32m
Deal found 9/26![United Airlines logo]()
$369
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/286:10 am -
1 stop4h 55m
Sat 1/26:20 am -
1 stop4h 42m
Deal found 9/26![Delta logo]()
$350
This American Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/306:47 pm -
1 stop6h 32m
Fri 11/65:29 pm -
1 stop4h 30m
Deal found 9/30![American Airlines logo]()
$363
This Southwest deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/226:25 am -
Nonstop2h 20m
Mon 10/2610:40 am -
Nonstop2h 15m
Deal found 9/30![Southwest logo]()
$277
This United Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 11/56:15 am -
1 stop6h 55m
Sun 11/86:00 am -
1 stop5h 05m
Deal found 9/30![United Airlines logo]()
$372
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/56:30 am -
1 stop5h 18m
Tue 3/911:51 am -
1 stop4h 21m
Deal found 9/26![Delta logo]()
$359
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 10/238:20 pm -
Nonstop1h 40m
Fri 10/304:30 pm -
2 stops6h 05m
Deal found 9/25![Southwest logo]()
$282
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/316:05 am -
1 stop7h 07m
Tue 11/38:00 am -
1 stop5h 16m
Deal found 9/29![United Airlines logo]()
$392
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:00 pm -
1 stop6h 56m
Mon 11/162:31 pm -
1 stop6h 56m
Deal found 9/27![Delta logo]()
$359
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.
Fri 11/205:00 am -
1 stop6h 00m
Mon 11/2310:15 am -
Nonstop1h 35m
Deal found 9/26![Southwest logo]()
$287
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:30 am -
1 stop5h 11m
Sat 10/2411:21 am -
1 stop6h 31m
Deal found 9/27![American Airlines logo]()
$434
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/251:00 pm -
1 stop6h 01m
Sun 2/283:40 pm -
1 stop6h 06m
Deal found 9/26![Delta logo]()
$359
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:35 pm -
1 stop6h 49m
Wed 11/48:00 am -
1 stop5h 16m
Deal found 9/29![United Airlines logo]()
$397
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.
Thu 10/226:25 am -
Nonstop2h 20m
Tue 11/32:35 pm -
1 stop7h 50m
Deal found 9/26![Southwest logo]()
$287
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1312:45 pm -
1 stop6h 28m
Mon 11/162:31 pm -
1 stop6h 56m
Deal found 9/27![Delta logo]()
$359
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 11/255:35 pm -
1 stop5h 05m
Sun 11/296:50 pm -
1 stop7h 15m
Deal found 9/28![United Airlines logo]()
$416
Last-minute flights from Pennsylvania to St. LouisDiscover last-minute flight deals from Pennsylvania to St. Louis. Data last updated September 30, 2026 and is based on user searches.
Discover last-minute flight deals from Pennsylvania to St. Louis. Data last updated September 30, 2026 and is based on user searches.
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.
Sun 10/410:10 am -
1 stop7h 24m
Wed 10/286:44 pm -
1 stop11h 27m
Deal found 9/26![Frontier logo]()
$282
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.
Sun 10/410:10 am -
1 stop7h 24m
Mon 11/26:44 pm -
1 stop11h 37m
Deal found 9/26![Frontier logo]()
$283
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/187:15 am -
1 stop16h 58m
Fri 10/236:35 pm -
1 stop11h 46m
Deal found 9/25![Frontier logo]()
$285
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.
Wed 10/215:40 am -
2 stops5h 40m
Wed 10/216:30 pm -
Nonstop1h 40m
Deal found 9/28![Southwest logo]()
$242
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/227:51 pm -
1 stop28h 22m
Mon 10/264:30 pm -
1 stop24h 02m
Deal found 9/27![Frontier logo]()
$223
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 10/226:50 am -
Nonstop1h 55m
Mon 10/267:55 pm -
Nonstop1h 40m
Deal found 9/28![Southwest logo]()
$227
This Southwest deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/226:25 am -
Nonstop2h 20m
Mon 10/2610:40 am -
Nonstop2h 15m
Deal found 9/30![Southwest logo]()
$277
This American Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/228:56 am -
Nonstop2h 45m
Mon 10/2611:21 am -
Nonstop2h 19m
Deal found 9/30![American Airlines logo]()
$278
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.
Thu 10/226:25 am -
Nonstop2h 20m
Tue 11/32:35 pm -
1 stop7h 50m
Deal found 9/26![Southwest logo]()
$287
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 10/236:50 am -
Nonstop1h 55m
Fri 10/307:55 pm -
Nonstop1h 40m
Deal found 9/25![Southwest logo]()
$267
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.
Mon 10/266:50 am -
Nonstop1h 55m
Fri 10/305:40 pm -
1 stop4h 55m
Deal found 9/25![Southwest logo]()
$257
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.
Wed 10/287:15 pm -
Nonstop1h 45m
Sun 11/110:15 am -
Nonstop1h 35m
Deal found 9/29![Southwest logo]()
$247
One-way flights from Pennsylvania to St. LouisSearch for one-way flight options from Pennsylvania to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 30, 2026.
Search for one-way flight options from Pennsylvania to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 30, 2026.
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.
Tue 10/205:22 pm -
1 stop25h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$43
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/275:00 pm -
1 stop25h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$48
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 11/1812:36 pm -
1 stop6h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$52
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 10/2812:36 pm -
1 stop6h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$58
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.
Thu 12/106:40 pm -
1 stop17h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$59
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/198:30 am -
1 stop11h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$68
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.
Tue 12/16:40 pm -
1 stop17h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$69
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:30 am -
1 stop10h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$71
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:59 pm -
1 stop6h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$101
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.
Tue 10/207:15 pm -
Nonstop1h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Southwest logo]()
$114
This Frontier deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 11/276:59 pm -
1 stop6h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$117
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.
Thu 11/265:55 am -
Nonstop2h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Southwest logo]()
$121
Find flight deals from Pennsylvania to St. Louis
Keep the following information in mind while searching for Pennsylvania to St. Louis flight deals. Data was last updated September 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $223 (Frontier) |
One-way from | $43 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $348 |
Good round-trip deal | $333 or less |
Good one-way deal | $213 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Pennsylvania to St. Louis 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 30, 2026.
Use the filters below to find and compare flights from Pennsylvania to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
PittsburghSt. Louis
PIT Pittsburgh - STL Lambert-St Louis
PITSTL
Pittsburgh
Wed 10/28
6:50 am-7:45 am
Nonstop1h 55m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$114
PittsburghSt. Louis
PIT Pittsburgh - STL Lambert-St Louis
PITSTL
Pittsburgh
Tue 12/29
6:45 am-7:40 am
Nonstop1h 55m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$121
PittsburghSt. Louis
PIT Pittsburgh - STL Lambert-St Louis
PITSTL
Pittsburgh
Wed 10/28
5:50 am-10:51 am
1 stop6h 01m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$124
PittsburghSt. Louis
PIT Pittsburgh - STL Lambert-St Louis
PITSTL
Pittsburgh
Sat 10/17
6:05 am-10:50 am
1 stop5h 45m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$124
PittsburghSt. Louis
PIT Pittsburgh - STL Lambert-St Louis
PITSTL
Pittsburgh
Tue 10/27
7:45 am-1:20 pm
1 stop6h 35m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$124
PittsburghSt. Louis
PIT Pittsburgh - STL Lambert-St Louis
PITSTL
Pittsburgh
Sat 10/31
11:45 am-6:12 pm
1 stop7h 27m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$124
PittsburghSt. Louis
PIT Pittsburgh - STL Lambert-St Louis
PITSTL
Pittsburgh
Tue 10/27
5:40 am-10:20 am
2 stops5h 40m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
PhiladelphiaSt. Louis
PHL Philadelphia - STL Lambert-St Louis
PHLSTL
Philadelphia
Tue 10/20
6:40 pm-8:00 pm
Nonstop2h 20m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$139
PhiladelphiaSt. Louis
PHL Philadelphia - STL Lambert-St Louis
PHLSTL
Philadelphia
Mon 10/26
6:25 am-7:45 am
Nonstop2h 20m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$139
PhiladelphiaSt. Louis
PHL Philadelphia - STL Lambert-St Louis
PHLSTL
Philadelphia
Wed 11/11
2:45 pm-4:20 pm
Nonstop2h 35m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$139
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Pennsylvania to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Pennsylvania with our price prediction graph.
PIT-STL
PHL-STL
AVP-STL
JST-STL
MDT-STL
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 Pennsylvania to St. Louis
USPA-STL
PIT-STL
PHL-STL
AVP-STL
JST-STL
What is the cheapest month to book a flight from Pennsylvania to St. Louis?
Currently, October is the cheapest month in which you can book a flight from Pennsylvania to St. Louis (average of $354). Flying from Pennsylvania to St. Louis in June is currently the most expensive (average of $470). 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 PA to STL?
Find hourly flight availability from Pennsylvania to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 30, 2026.
When flying from Pennsylvania to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 10% versus a flight in the morning.
How much does it cost to fly round-trip from Pennsylvania to St. Louis?
Airfare is below average for this route at the moment.
Pennsylvania to St. Louis flights typically cost between $301 and $464 in October.The cheapest round-trip price found within the last 5 days was $277 on Southwest (Oct 22-Oct 26).
How far ahead should I book a flight from Pennsylvania to St. Louis?
To ensure you get the cheapest price possible for a flight from Pennsylvania to St. Louis, you should look to book at least 28 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 Pennsylvania to St. Louis?
Use this chart to determine the cheapest time to fly round-trip from Pennsylvania to St. Louis. Price data was last updated on September 26, 2026.
Travelers seeking maximum savings on their Pennsylvania to St. Louis flight should consider departing on Thursday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from Pennsylvania to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Wentzville
Chesterfield
Maryland Heights
Collinsville
Edwardsville
Glencoe
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Alternative routes for Pennsylvania to St. Louis
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Complete your trip
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Pennsylvania and St. Louis flights
Browse other Pennsylvania and St. Louis flight options. Last updated on September 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 30, 2026.
Pennsylvania to St. Louis flights
Consider these flights traveling from Pennsylvania to St. Louis.
Top 5 airlines flying from Pennsylvania to St. Louis
Discover the top 5 airlines that operate flights from Pennsylvania to St. Louis. 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 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$144 | Average$229 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$170 | Average$436 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$188 | Average$396 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$217 | Average$396 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$264 | Average$416 | FlexibilityNo cancel fee | On-time69% |