$69+ 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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
Nov 29 — Dec 61
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Cheapest
Best
Last-minute
One-way
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 October 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 October 30, 2026.
This CheapOair deal was found by Cheapflights users on 10/28. 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.
Thu 11/1911:43 am -
1 stop25h 42m
Mon 11/236:05 pm -
1 stop22h 59m
Deal found 10/28![Frontier logo]()
$202
This Trip.com deal was found by Cheapflights users on 10/28. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:59 pm -
1 stop6h 00m
Wed 12/26:13 pm -
1 stop22h 15m
Deal found 10/28![Frontier logo]()
$206
This Southwest deal was found by Cheapflights users on 10/26. 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 11/166:30 pm -
Nonstop1h 55m
Thu 11/196:15 pm -
Nonstop1h 40m
Deal found 10/26![Southwest logo]()
$211
This Southwest deal was found by Cheapflights users on 10/28. 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 11/259:10 pm -
1 stop4h 05m
Wed 12/26:15 pm -
Nonstop1h 40m
Deal found 10/28![Southwest logo]()
$221
This American Airlines deal was found by Cheapflights users on 10/28. 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 12/33:57 pm -
1 stop5h 01m
Fri 12/43:40 pm -
1 stop4h 37m
Deal found 10/28![American Airlines logo]()
$240
This Southwest deal was found by Cheapflights users on 10/28. 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 12/32:20 pm -
1 stop3h 50m
Fri 12/46:15 pm -
Nonstop1h 40m
Deal found 10/28![Southwest logo]()
$241
This CheapOair deal was found by Cheapflights users on 10/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/116:28 pm -
1 stop6h 44m
Sun 12/136:20 pm -
1 stop22h 13m
Deal found 10/25![Frontier logo]()
$242
This Southwest deal was found by Cheapflights users on 10/27. 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 12/26:50 am -
Nonstop1h 55m
Sun 12/67:55 pm -
Nonstop1h 40m
Deal found 10/27![Southwest logo]()
$254
This American Airlines deal was found by Cheapflights users on 10/29. 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.
Fri 12/189:39 pm -
Nonstop2h 46m
Fri 1/16:00 am -
Nonstop2h 13m
Deal found 10/29![American Airlines logo]()
$277
This Cheapflightsfares deal was found by Cheapflights users on 10/28. 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 11/48:30 am -
1 stop10h 10m
Sat 11/74:26 pm -
1 stop7h 09m
Deal found 10/28![Frontier logo]()
$278
This Cheapflightsfares deal was found by Cheapflights users on 10/26. 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.
Fri 11/137:35 am -
1 stop16h 41m
Mon 11/166:34 pm -
1 stop11h 47m
Deal found 10/26![Frontier logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 12/68:40 am -
2 stops27h 17m
Wed 12/912:02 pm -
1 stop8h 05m
Deal found 10/26![Frontier logo]()
$281
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 October 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 October 30, 2026.
This Southwest deal was found by Cheapflights users on 10/28. 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.
Mon 12/76:30 pm -
Nonstop1h 55m
Thu 12/1010:15 am -
Nonstop1h 30m
Deal found 10/28![Southwest logo]()
$211
This Delta deal was found by Cheapflights users on 10/26. 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 2/57:00 am -
1 stop5h 04m
Mon 2/84:56 pm -
1 stop6h 50m
Deal found 10/26![Delta logo]()
$267
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Fri 1/298:40 am -
1 stop4h 33m
Sun 1/319:05 am -
1 stop4h 42m
Deal found 10/26![United Airlines logo]()
$301
This Kiwi.com deal was found by Cheapflights users on 10/30. 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.
Wed 11/189:16 pm -
1 stop27h 00m
Mon 12/1412:02 pm -
2 stops44h 54m
Deal found 10/30![Multiple Airlines logo]()
$305
This American Airlines deal was found by Cheapflights users on 10/29. 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.
Thu 2/47:43 am -
1 stop5h 40m
Tue 2/95:42 am -
1 stop7h 10m
Deal found 10/29![American Airlines logo]()
$330
This Southwest deal was found by Cheapflights users on 10/28. 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 11/196:50 am -
Nonstop1h 55m
Mon 11/237:55 pm -
Nonstop1h 40m
Deal found 10/28![Southwest logo]()
$211
This Delta deal was found by Cheapflights users on 10/26. 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 1/265:40 am -
1 stop6h 24m
Fri 1/296:59 pm -
1 stop4h 46m
Deal found 10/26![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 10/27. 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 12/36:30 pm -
Nonstop1h 55m
Sun 12/64:30 pm -
1 stop5h 55m
Deal found 10/27![Southwest logo]()
$264
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Wed 11/252:07 pm -
1 stop3h 52m
Sun 11/296:50 pm -
1 stop6h 41m
Deal found 10/26![United Airlines logo]()
$310
This Southwest deal was found by Cheapflights users on 10/28. 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.
Sat 2/66:50 am -
Nonstop1h 55m
Sat 2/133:55 pm -
1 stop7h 10m
Deal found 10/28![Southwest logo]()
$267
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Wed 2/106:20 am -
1 stop4h 48m
Sat 2/138:00 am -
1 stop4h 22m
Deal found 10/26![United Airlines logo]()
$321
This Delta deal was found by Cheapflights users on 10/25. 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 stop4h 25m
Mon 11/236:26 pm -
1 stop3h 40m
Deal found 10/25![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 10/29. 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.
Thu 12/177:25 pm -
Nonstop2h 35m
Sat 12/1910:00 am -
1 stop7h 40m
Deal found 10/29![Southwest logo]()
$287
This United Airlines deal was found by Cheapflights users on 10/29. 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 12/56:17 am -
1 stop5h 13m
Sat 12/126:30 am -
1 stop5h 55m
Deal found 10/29![United Airlines logo]()
$321
This Delta deal was found by Cheapflights users on 10/25. 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 11/1212:09 pm -
1 stop6h 05m
Mon 11/236:26 pm -
1 stop3h 40m
Deal found 10/25![Delta logo]()
$354
This Southwest deal was found by Cheapflights users on 10/27. 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 11/2611:45 am -
2 stops6h 10m
Thu 12/310:55 am -
2 stops6h 00m
Deal found 10/27![Southwest logo]()
$298
This Southwest deal was found by Cheapflights users on 10/27. 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 12/42:45 pm -
Nonstop2h 35m
Mon 12/76:20 pm -
Nonstop2h 10m
Deal found 10/27![Southwest logo]()
$311
This Delta deal was found by Cheapflights users on 10/27. 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.
Mon 1/116:03 pm -
1 stop6h 23m
Thu 1/143:48 pm -
1 stop5h 51m
Deal found 10/27![Delta logo]()
$377
This United Airlines deal was found by Cheapflights users on 10/27. 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 12/26:00 pm -
1 stop5h 59m
Sun 12/66:30 am -
1 stop5h 44m
Deal found 10/27![United Airlines logo]()
$381
This Southwest deal was found by Cheapflights users on 10/29. 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 12/136:50 am -
Nonstop2h 00m
Sun 12/205:30 am -
1 stop3h 30m
Deal found 10/29![Southwest logo]()
$321
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Tue 11/105:35 pm -
1 stop5h 05m
Sat 11/146:50 pm -
1 stop4h 37m
Deal found 10/26![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 10/26. 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 11/136:00 pm -
1 stop6h 56m
Tue 11/1710:05 am -
1 stop6h 10m
Deal found 10/26![Delta logo]()
$391
This American Airlines deal was found by Cheapflights users on 10/29. 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.
Fri 11/138:01 am -
1 stop5h 49m
Tue 11/1710:33 am -
2 stops10h 34m
Deal found 10/29![American Airlines logo]()
$584
This Southwest deal was found by Cheapflights users on 10/29. 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 12/91:25 pm -
1 stop4h 45m
Fri 12/118:10 pm -
Nonstop2h 10m
Deal found 10/29![Southwest logo]()
$321
This Delta deal was found by Cheapflights users on 10/28. 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.
Thu 11/126:00 pm -
1 stop6h 56m
Wed 11/186:00 am -
1 stop5h 04m
Deal found 10/28![Delta logo]()
$391
This United Airlines deal was found by Cheapflights users on 10/27. 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.
Tue 11/1710:54 am -
1 stop5h 49m
Thu 11/195:00 am -
1 stop6h 05m
Deal found 10/27![United Airlines logo]()
$396
This Delta deal was found by Cheapflights users on 10/26. 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 11/136:00 pm -
1 stop6h 56m
Mon 11/1610:05 am -
1 stop6h 10m
Deal found 10/26![Delta logo]()
$407
This Southwest deal was found by Cheapflights users on 10/26. 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 12/67:25 pm -
Nonstop2h 35m
Wed 12/910:45 am -
Nonstop2h 15m
Deal found 10/26![Southwest logo]()
$344
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Thu 12/248:35 am -
1 stop6h 43m
Sat 1/210:45 am -
1 stop7h 48m
Deal found 10/28![United Airlines logo]()
$439
This Delta deal was found by Cheapflights users on 10/29. 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.
Sat 11/146:00 pm -
1 stop6h 56m
Mon 11/162:31 pm -
1 stop6h 56m
Deal found 10/29![Delta logo]()
$407
Last-minute flights from Pennsylvania to St. LouisDiscover last-minute flight deals from Pennsylvania to St. Louis. Data last updated October 30, 2026 and is based on user searches.
Discover last-minute flight deals from Pennsylvania to St. Louis. Data last updated October 30, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 10/28. 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 11/48:30 am -
1 stop10h 10m
Sat 11/74:26 pm -
1 stop7h 09m
Deal found 10/28![Frontier logo]()
$278
This Cheapflightsfares deal was found by Cheapflights users on 10/26. 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.
Fri 11/137:35 am -
1 stop16h 41m
Mon 11/166:34 pm -
1 stop11h 47m
Deal found 10/26![Frontier logo]()
$279
This Cheapflightsfares deal was found by Cheapflights users on 10/27. 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.
Sun 11/155:45 pm -
1 stop6h 31m
Thu 11/194:26 pm -
1 stop7h 09m
Deal found 10/27![Frontier logo]()
$284
This Southwest deal was found by Cheapflights users on 10/26. 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 11/166:30 pm -
Nonstop1h 55m
Thu 11/196:15 pm -
Nonstop1h 40m
Deal found 10/26![Southwest logo]()
$211
This Mytrip deal was found by Cheapflights users on 10/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:35 am -
2 stops11h 07m
Sun 11/225:15 pm -
1 stop11h 46m
Deal found 10/26![Frontier logo]()
$277
This CheapOair deal was found by Cheapflights users on 10/28. 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.
Thu 11/1911:43 am -
1 stop25h 42m
Mon 11/236:05 pm -
1 stop22h 59m
Deal found 10/28![Frontier logo]()
$202
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/235:01 am -
1 stop8h 24m
Mon 11/236:35 pm -
2 stops12h 27m
Deal found 10/29![Frontier logo]()
$291
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Tue 11/248:29 pm -
1 stop4h 32m
Sat 11/287:26 am -
1 stop4h 04m
Deal found 10/28![American Airlines logo]()
$287
This Trip.com deal was found by Cheapflights users on 10/28. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:59 pm -
1 stop6h 00m
Wed 12/26:13 pm -
1 stop22h 15m
Deal found 10/28![Frontier logo]()
$206
This Southwest deal was found by Cheapflights users on 10/28. 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 11/259:10 pm -
1 stop4h 05m
Wed 12/26:15 pm -
Nonstop1h 40m
Deal found 10/28![Southwest logo]()
$221
This Mytrip deal was found by Cheapflights users on 10/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/257:06 am -
2 stops11h 34m
Wed 12/26:13 pm -
2 stops17h 54m
Deal found 10/26![Frontier logo]()
$295
This Mytrip deal was found by Cheapflights users on 10/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/276:10 am -
2 stops12h 30m
Wed 12/212:05 pm -
2 stops11h 42m
Deal found 10/25![Frontier logo]()
$283
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 October 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 October 30, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 10/27. 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 11/1812:36 pm -
1 stop6h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 10/27. 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.
Sun 12/138:40 am -
1 stop27h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Frontier logo]()
$72
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/154:31 pm -
1 stop19h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Frontier logo]()
$75
This Expedia deal was found by Cheapflights users on 10/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/245:01 am -
1 stop19h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Frontier logo]()
$106
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/175:14 pm -
1 stop25h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Frontier logo]()
$110
This Cheapflightsfares deal was found by Cheapflights users on 10/25. 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 10/25![Frontier logo]()
$116
This Cheapflightsfares deal was found by Cheapflights users on 10/25. 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.
Sat 11/145:45 pm -
1 stop6h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Frontier logo]()
$118
This Frontier deal was found by Cheapflights users on 10/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:36 pm -
1 stop6h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Frontier logo]()
$120
This Priceline deal was found by Cheapflights users on 10/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/206:17 pm -
1 stop7h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Frontier logo]()
$123
This Southwest deal was found by Cheapflights users on 10/28. 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 11/276:30 am -
Nonstop2h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Southwest logo]()
$126
This Southwest deal was found by Cheapflights users on 10/29. 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 12/286:50 am -
Nonstop1h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Southwest logo]()
$129
This Delta deal was found by Cheapflights users on 10/28. 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.
Fri 11/276:10 am -
1 stop4h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![Delta logo]()
$131
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 October 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $202 (CheapOair) |
One-way from | $69 (Cheapflightsfares) |
Popular in | June |
Cheapest in | September |
Average price | $365 |
Good round-trip deal | $308 or less |
Good one-way deal | $218 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 October 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
PittsburghSt. Louis
PIT Pittsburgh - STL Lambert-St Louis
PITSTL
Pittsburgh
Fri 11/27
6:30 am-7:30 am
Nonstop2h 00m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$126
PhiladelphiaSt. Louis
PHL Philadelphia - STL Lambert-St Louis
PHLSTL
Philadelphia
Wed 12/30
5:25 am-6:55 am
Nonstop2h 30m
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 11/25
8:45 pm-12:15 am
1 stop4h 30m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$156
PhiladelphiaSt. Louis
PHL Philadelphia - STL Lambert-St Louis
PHLSTL
Philadelphia
Thu 11/12
7:25 pm-5:42 pm
2 stops23h 17m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$163
Quickest round-trip
PittsburghSt. Louis
PIT Pittsburgh - STL Lambert-St Louis
PITSTL
Pittsburgh
Sun 12/20
8:15 pm-9:00 pm
Nonstop1h 45m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$163
PhiladelphiaSt. Louis
PHL Philadelphia - STL Lambert-St Louis
PHLSTL
Philadelphia
Tue 12/29
5:25 am-6:55 am
Nonstop2h 30m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$179
PhiladelphiaSt. Louis
PHL Philadelphia - STL Lambert-St Louis
PHLSTL
Philadelphia
Thu 11/19
2:45 pm-4:20 pm
Nonstop2h 35m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$179
PhiladelphiaSt. Louis
PHL Philadelphia - STL Lambert-St Louis
PHLSTL
Philadelphia
Tue 11/17
2:45 pm-4:20 pm
Nonstop2h 35m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$186
AllentownSt. Louis
ABE Allentown-Bethlehem - STL Lambert-St Louis
ABESTL
Allentown-Bethlehem
Mon 1/11
6:03 pm-11:26 pm
1 stop6h 23m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$189
AllentownSt. Louis
ABE Allentown-Bethlehem - STL Lambert-St Louis
ABESTL
Allentown-Bethlehem
Fri 1/8
6:00 am-12:13 pm
1 stop7h 13m
Lambert-St Louis
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$189
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
ABE-STL
SCE-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
ABE-STL
SCE-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 $373). 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 October 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 12% 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 $298 and $484 in December.The cheapest round-trip price found within the last 5 days was $277 on American Airlines (Dec 18-Jan 1).
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 64 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 October 24, 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
Maryland Heights
Chesterfield
Collinsville
Edwardsville
Glencoe
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
St. Louis flight routes
Top destinations
Alternative routes for Pennsylvania to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Pennsylvania to St. Louis by cabin class
Find flights from Pennsylvania to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Pennsylvania and St. Louis flights
Browse other Pennsylvania and St. Louis flight options. Last updated on October 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 October 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 October 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$142 | Average$228 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$174 | Average$442 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$188 | Average$392 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$217 | Average$389 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$264 | Average$416 | FlexibilityNo cancel fee | On-time69% |