$63+ Cheap flights from St. Louis (STL) to Pennsylvania
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
May 30 — Jun 61
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Pennsylvania with Cheapflights
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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 April 30, 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 April 30, 2026.
This Frontier deal was found by Cheapflights users on 4/25. 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.
Sat 5/168:08 pm
STL
- PHL
1 stop8h 29m
Frontier
Tue 5/197:48 am
PHL
- STL
1 stop10h 45m
Frontier
Deal found 4/25![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Sat 6/65:27 pm
STL
- EWR
1 stop6h 51m
Frontier
Tue 6/910:29 pm
EWR
- STL
1 stop11h 18m
Frontier
Deal found 4/28![Frontier logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Wed 5/205:27 pm
STL
- EWR
1 stop6h 51m
Frontier
Sun 5/2410:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 4/28![Frontier logo]()
$158
This Expedia deal was found by Cheapflights users on 4/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:19 pm
STL
- PHL
1 stop15h 40m
Frontier
Tue 6/27:55 am
PHL
- STL
1 stop17h 02m
Frontier
Deal found 4/26![Frontier logo]()
$160
This Expedia deal was found by Cheapflights users on 4/27. 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.
Mon 5/184:19 pm
STL
- EWR
1 stop17h 13m
Frontier
Fri 5/2911:30 am
EWR
- STL
1 stop13h 27m
Frontier
Deal found 4/27![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 4/25. 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.
Thu 5/144:19 pm
STL
- PHL
1 stop7h 21m
Frontier
Mon 5/1810:11 am
PHL
- STL
1 stop15h 10m
Frontier
Deal found 4/25![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 6/26:33 pm
STL
- EWR
1 stop5h 45m
Frontier
Thu 6/45:55 am
EWR
- STL
1 stop12h 38m
Frontier
Deal found 4/29![Frontier logo]()
$169
This Booking.com deal was found by Cheapflights users on 4/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/154:19 pm
STL
- PHL
1 stop15h 35m
Frontier
Mon 5/187:55 am
PHL
- STL
1 stop17h 26m
Frontier
Deal found 4/27![Frontier logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/275:27 pm
STL
- EWR
2 stops25h 54m
Multiple Airlines
Wed 6/310:29 pm
EWR
- STL
1 stop20h 04m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$177
This Frontier deal was found by Cheapflights users on 4/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:27 pm
STL
- EWR
1 stop6h 51m
Frontier
Mon 6/811:30 am
EWR
- STL
1 stop13h 27m
Frontier
Deal found 4/28![Frontier logo]()
$180
This Expedia deal was found by Cheapflights users on 4/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/135:27 pm
STL
- EWR
1 stop6h 51m
Frontier
Tue 5/2610:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 4/25![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 6/26:33 pm
STL
- EWR
2 stops13h 26m
Multiple Airlines
Thu 6/45:55 am
EWR
- STL
1 stop12h 38m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$182
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 April 30, 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 April 30, 2026.
This Southwest deal was found by Cheapflights users on 4/29. 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 5/205:35 am
STL
- PIT
1 stop3h 40m
Southwest
Tue 5/267:10 pm
PIT
- STL
Nonstop1h 50m
Southwest
Deal found 4/29![Southwest logo]()
$247
This Delta deal was found by Cheapflights users on 4/29. 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 6/210:19 am
STL
- PIT
1 stop4h 18m
Delta
Wed 6/35:59 pm
PIT
- STL
1 stop4h 10m
Delta
Deal found 4/29![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Sat 5/235:29 pm
STL
- DCA
1 stop4h 25m
United Airlines
Wed 5/2711:57 am
DCA
- STL
1 stop4h 49m
United Airlines
Deal found 4/27![United Airlines logo]()
$271
This American Airlines deal was found by Cheapflights users on 4/28. 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 6/46:00 am
STL
- MDT
1 stop4h 12m
American Airlines
Sat 6/67:40 pm
MDT
- STL
1 stop5h 19m
American Airlines
Deal found 4/28![American Airlines logo]()
$300
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Thu 6/114:17 pm
STL
- ABE
1 stop26h 40m
Multiple Airlines
Sun 6/1412:29 pm
ABE
- STL
2 stops7h 07m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$434
This Southwest deal was found by Cheapflights users on 4/27. 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 5/266:45 pm
STL
- PIT
Nonstop1h 35m
Southwest
Fri 5/298:10 pm
PIT
- STL
1 stop4h 05m
Southwest
Deal found 4/27![Southwest logo]()
$270
This Delta deal was found by Cheapflights users on 4/27. 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.
Thu 6/46:00 am
STL
- PIT
1 stop5h 44m
Delta
Mon 6/85:30 am
PIT
- STL
1 stop5h 16m
Delta
Deal found 4/27![Delta logo]()
$275
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Tue 6/29:23 am
STL
- PIT
1 stop5h 00m
United Airlines
Wed 6/310:54 am
PIT
- STL
1 stop5h 52m
United Airlines
Deal found 4/29![United Airlines logo]()
$277
This Southwest deal was found by Cheapflights users on 4/29. 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 6/26:50 pm
STL
- PHL
Nonstop2h 10m
Southwest
Thu 6/46:00 pm
PHL
- STL
Nonstop2h 35m
Southwest
Deal found 4/29![Southwest logo]()
$274
This Delta deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/110:51 am
STL
- PIT
1 stop5h 26m
Delta
Mon 7/67:00 am
PIT
- STL
1 stop6h 34m
Delta
Deal found 4/25![Delta logo]()
$280
This United Airlines deal was found by Cheapflights users on 4/28. 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 6/95:41 pm
STL
- EWR
1 stop6h 01m
United Airlines
Wed 6/1010:07 pm
EWR
- STL
Nonstop2h 28m
United Airlines
Deal found 4/28![United Airlines logo]()
$283
This Southwest deal was found by Cheapflights users on 4/25. 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 5/218:30 am
STL
- DCA
1 stop6h 25m
Southwest
Mon 5/258:00 am
DCA
- STL
Nonstop2h 20m
Southwest
Deal found 4/25![Southwest logo]()
$275
This American Airlines deal was found by Cheapflights users on 4/28. 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.
Wed 5/139:10 am
STL
- MDT
1 stop5h 57m
American Airlines
Sun 5/175:41 am
MDT
- STL
1 stop7h 06m
American Airlines
Deal found 4/28![American Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 4/27. 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 6/308:43 am
STL
- IAD
Nonstop2h 12m
United Airlines
Tue 7/143:30 pm
IAD
- STL
1 stop6h 56m
United Airlines
Deal found 4/27![United Airlines logo]()
$286
This Delta deal was found by Cheapflights users on 4/25. 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 5/231:05 pm
STL
- LGA
Nonstop2h 33m
Delta
Tue 5/261:55 pm
LGA
- STL
Nonstop2h 45m
Delta
Deal found 4/25![Delta logo]()
$294
This Southwest deal was found by Cheapflights users on 4/28. 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 5/191:45 pm
STL
- DCA
1 stop4h 25m
Southwest
Wed 6/311:40 am
DCA
- STL
2 stops7h 20m
Southwest
Deal found 4/28![Southwest logo]()
$276
This Delta deal was found by Cheapflights users on 4/25. 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 6/206:30 am
STL
- DCA
1 stop4h 04m
Delta
Wed 6/246:00 am
DCA
- STL
1 stop4h 46m
Delta
Deal found 4/25![Delta logo]()
$296
This United Airlines deal was found by Cheapflights users on 4/26. 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 6/178:00 am
STL
- PIT
1 stop4h 09m
United Airlines
Fri 6/196:11 pm
PIT
- STL
1 stop5h 33m
United Airlines
Deal found 4/26![United Airlines logo]()
$300
This Southwest deal was found by Cheapflights users on 4/27. 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 6/308:30 am
STL
- DCA
Nonstop1h 55m
Southwest
Tue 7/146:40 pm
DCA
- STL
Nonstop2h 20m
Southwest
Deal found 4/27![Southwest logo]()
$276
This Delta deal was found by Cheapflights users on 4/26. 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 6/306:00 am
STL
- IAD
1 stop4h 43m
Delta
Tue 7/146:00 am
IAD
- STL
1 stop4h 31m
Delta
Deal found 4/26![Delta logo]()
$296
This Southwest deal was found by Cheapflights users on 4/26. 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.
Wed 6/173:10 pm
STL
- PIT
1 stop6h 10m
Southwest
Fri 6/198:15 pm
PIT
- STL
Nonstop1h 45m
Southwest
Deal found 4/26![Southwest logo]()
$280
This United Airlines deal was found by Cheapflights users on 4/27. 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 6/36:00 am
STL
- IAD
1 stop7h 08m
United Airlines
Sun 6/79:00 am
IAD
- STL
Nonstop2h 27m
United Airlines
Deal found 4/27![United Airlines logo]()
$319
This Delta deal was found by Cheapflights users on 4/29. 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.
Fri 5/2910:19 am
STL
- MDT
1 stop4h 58m
Delta
Sun 5/316:20 am
MDT
- STL
1 stop4h 09m
Delta
Deal found 4/29![Delta logo]()
$300
This United Airlines deal was found by Cheapflights users on 4/27. 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 6/36:00 am
STL
- EWR
Nonstop2h 29m
United Airlines
Sun 6/710:07 pm
EWR
- STL
Nonstop2h 28m
United Airlines
Deal found 4/27![United Airlines logo]()
$321
This Southwest deal was found by Cheapflights users on 4/25. 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.
Sun 9/2010:15 am
STL
- PIT
Nonstop1h 40m
Southwest
Fri 9/257:20 pm
PIT
- STL
Nonstop1h 40m
Southwest
Deal found 4/25![Southwest logo]()
$303
This American Airlines deal was found by Cheapflights users on 4/26. 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.
Wed 7/1512:40 pm
STL
- ABE
1 stop4h 52m
American Airlines
Mon 7/207:10 pm
ABE
- STL
1 stop5h 47m
American Airlines
Deal found 4/26![American Airlines logo]()
$491
This Delta deal was found by Cheapflights users on 4/25. 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 6/166:00 am
STL
- DCA
1 stop4h 07m
Delta
Fri 6/196:25 pm
DCA
- STL
1 stop6h 31m
Delta
Deal found 4/25![Delta logo]()
$307
This United Airlines deal was found by Cheapflights users on 4/28. 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 6/96:00 am
STL
- EWR
Nonstop2h 29m
United Airlines
Thu 6/117:59 am
EWR
- STL
1 stop5h 12m
United Airlines
Deal found 4/28![United Airlines logo]()
$331
This Delta deal was found by Cheapflights users on 4/25. 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 5/187:01 pm
STL
- IAD
1 stop4h 50m
Delta
Wed 5/207:38 pm
IAD
- STL
1 stop5h 21m
Delta
Deal found 4/25![Delta logo]()
$308
This Southwest deal was found by Cheapflights users on 4/28. 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 5/223:45 pm
STL
- DCA
Nonstop2h 00m
Southwest
Mon 5/256:45 pm
DCA
- STL
Nonstop2h 25m
Southwest
Deal found 4/28![Southwest logo]()
$334
Last-minute flights from St. Louis to PennsylvaniaDiscover last-minute flight deals from St. Louis to Pennsylvania. Data last updated April 30, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Pennsylvania. Data last updated April 30, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 4/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/135:27 pm
STL
- EWR
1 stop6h 51m
Frontier
Tue 5/2610:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 4/25![Frontier logo]()
$181
This Frontier deal was found by Cheapflights users on 4/25. 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.
Thu 5/144:19 pm
STL
- PHL
1 stop7h 21m
Frontier
Mon 5/1810:11 am
PHL
- STL
1 stop15h 10m
Frontier
Deal found 4/25![Frontier logo]()
$162
This Booking.com deal was found by Cheapflights users on 4/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/154:19 pm
STL
- PHL
1 stop15h 35m
Frontier
Mon 5/187:55 am
PHL
- STL
1 stop17h 26m
Frontier
Deal found 4/27![Frontier logo]()
$172
This Frontier deal was found by Cheapflights users on 4/25. 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.
Sat 5/168:08 pm
STL
- PHL
1 stop8h 29m
Frontier
Tue 5/197:48 am
PHL
- STL
1 stop10h 45m
Frontier
Deal found 4/25![Frontier logo]()
$140
This Expedia deal was found by Cheapflights users on 4/27. 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.
Mon 5/184:19 pm
STL
- EWR
1 stop17h 13m
Frontier
Fri 5/2911:30 am
EWR
- STL
1 stop13h 27m
Frontier
Deal found 4/27![Frontier logo]()
$160
This Booking.com deal was found by Cheapflights users on 4/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/184:19 pm
STL
- PHL
1 stop15h 40m
Frontier
Wed 5/208:35 pm
PHL
- STL
1 stop23h 48m
Frontier
Deal found 4/27![Frontier logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Wed 5/205:27 pm
STL
- EWR
1 stop6h 51m
Frontier
Sun 5/2410:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 4/28![Frontier logo]()
$158
This Expedia deal was found by Cheapflights users on 4/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/249:06 pm
STL
- PHL
1 stop32h 15m
Frontier
Sun 5/318:30 am
PHL
- STL
1 stop10h 03m
Frontier
Deal found 4/29![Frontier logo]()
$185
This Expedia deal was found by Cheapflights users on 4/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:19 pm
STL
- PHL
1 stop15h 40m
Frontier
Tue 6/27:55 am
PHL
- STL
1 stop17h 02m
Frontier
Deal found 4/26![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/275:27 pm
STL
- EWR
2 stops25h 54m
Multiple Airlines
Wed 6/310:29 pm
EWR
- STL
1 stop20h 04m
Multiple Airlines
Deal found 4/29![Multiple Airlines logo]()
$177
This Frontier deal was found by Cheapflights users on 4/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/286:33 pm
STL
- EWR
1 stop5h 45m
Frontier
Tue 6/210:29 pm
EWR
- STL
1 stop11h 26m
Frontier
Deal found 4/28![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 4/28. 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.
Thu 5/286:33 pm
STL
- EWR
1 stop5h 45m
Frontier
Thu 6/45:55 am
EWR
- STL
1 stop12h 38m
Frontier
Deal found 4/28![Frontier logo]()
$186
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 April 30, 2026.
Search for one-way flight options from St. Louis to Pennsylvania. Find affordable one-way fares based on user searches. Data last updated April 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 5/205:27 pm
STL
- IAD
1 stop17h 34m
Frontier
Deal found 4/27![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 4/29. 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 6/236:31 pm
STL
- IAD
1 stop14h 51m
Frontier
Deal found 4/29![Frontier logo]()
$65
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Tue 5/266:33 pm
STL
- IAD
1 stop14h 39m
Frontier
Deal found 4/25![Frontier logo]()
$68
This Kiwi.com deal was found by Cheapflights users on 4/26. 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 6/15:27 pm
STL
- IAD
1 stop15h 45m
Frontier
Deal found 4/26![Frontier logo]()
$69
This Priceline deal was found by Cheapflights users on 4/26. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/235:27 pm
STL
- IAD
1 stop4h 42m
Frontier
Deal found 4/26![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Sat 6/65:27 pm
STL
- EWR
1 stop6h 51m
Frontier
Deal found 4/27![Frontier logo]()
$71
This Frontier deal was found by Cheapflights users on 4/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:33 pm
STL
- PHL
1 stop11h 39m
Frontier
Deal found 4/29![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 4/29. 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.
Wed 6/105:06 pm
STL
- EWR
1 stop27h 23m
Frontier
Deal found 4/29![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 6/245:06 pm
STL
- PHL
1 stop13h 13m
Frontier
Deal found 4/27![Frontier logo]()
$88
This Super.com deal was found by Cheapflights users on 4/28. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:27 pm
STL
- IAD
1 stop4h 42m
Frontier
Deal found 4/28![Frontier logo]()
$89
This Expedia deal was found by Cheapflights users on 4/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/154:19 pm
STL
- PHL
1 stop6h 10m
Frontier
Deal found 4/29![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 4/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/305:27 pm
STL
- IAD
1 stop4h 42m
Frontier
Deal found 4/26![Frontier logo]()
$90
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 April 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $140 (Frontier) |
One-way from | $63 (Kiwi.com) |
Popular in | November |
Cheapest in | August |
Average price | $412 |
Good round-trip deal | $395 or less |
Good one-way deal | $184 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Pennsylvania that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 30, 2026.
Use the filters below to find and compare flights from St. Louis to Pennsylvania that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Wed 5/20
5:35 am-10:15 am
1 stop3h 40m
Pittsburgh
Tue 5/26
7:10 pm-8:00 pm
Nonstop1h 50m
$247
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Tue 6/2
10:19 am-3:37 pm
1 stop4h 18m
Pittsburgh
Wed 6/3
5:59 pm-9:09 pm
1 stop4h 10m
$257
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Tue 5/26
6:45 pm-9:20 pm
Nonstop1h 35m
Pittsburgh
Fri 5/29
8:10 pm-11:15 pm
1 stop4h 05m
$270
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
Sat 5/23
5:29 pm-10:54 pm
1 stop4h 25m
Washington, D.C. Reagan-National
Wed 5/27
11:57 am-3:46 pm
1 stop4h 49m
$271
St. LouisPhiladelphia
STL - PHL
STLPHL
Lambert-St Louis
Tue 6/2
6:50 pm-10:00 pm
Nonstop2h 10m
Philadelphia
Thu 6/4
6:00 pm-7:35 pm
Nonstop2h 35m
$274
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Thu 6/4
6:00 am-12:44 pm
1 stop5h 44m
Pittsburgh
Mon 6/8
5:30 am-9:46 am
1 stop5h 16m
$275
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
Thu 5/21
8:30 am-3:55 pm
1 stop6h 25m
Washington, D.C. Reagan-National
Mon 5/25
8:00 am-9:20 am
Nonstop2h 20m
$275
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
Tue 5/19
1:45 pm-7:10 pm
1 stop4h 25m
Washington, D.C. Reagan-National
Wed 6/3
11:40 am-6:00 pm
2 stops7h 20m
$276
St. LouisWashington, D.C.
STL - DCA
STLDCA
Lambert-St Louis
Tue 6/30
8:30 am-11:25 am
Nonstop1h 55m
Washington, D.C. Reagan-National
Tue 7/14
6:40 pm-8:00 pm
Nonstop2h 20m
$276
St. LouisPittsburgh
STL - PIT
STLPIT
Lambert-St Louis
Tue 6/2
9:23 am-3:23 pm
1 stop5h 00m
Pittsburgh
Wed 6/3
10:54 am-3:46 pm
1 stop5h 52m
$277
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from St. Louis to Pennsylvania
Have a flexible travel schedule? Discover the best time to fly to Pennsylvania from St. Louis with our price prediction graph.
STL-PHL
STL-EWR
STL-PIT
STL-DCA
STL-MDT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Pennsylvania
STL-USPA
STL-PHL
STL-EWR
STL-PIT
STL-DCA
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 52 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 month to book a flight from St. Louis to Pennsylvania?
Currently, October is the cheapest month in which you can book a flight from St. Louis to Pennsylvania (average of $76). Flying from St. Louis to Pennsylvania in June is currently the most expensive (average of $196). 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 April 30, 2026.
It’s optimal to fly from St. Louis to Pennsylvania in the morning. By choosing this option you can save up to 38% on the cost of your flight, compared to a flight at noon.
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 April 25, 2026.
Travelers seeking maximum savings on their St. Louis to Pennsylvania flight should consider departing on Tuesday at noon when fares are most often at their lowest. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 April 30, 2026.
The most flights from STL to USPA are scheduled on a Monday (8 on average). You will have fewer flight options on Saturday, 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?
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 April 30, 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.
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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
See prices for flight routes from nearby airports that may be better suited for you.
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 April 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
St. Louis to Pennsylvania flights
Consider these flights traveling from St. Louis to Pennsylvania.
Top 6 airlines flying from St. Louis to Pennsylvania
Discover the top 6 airlines that operate flights from St. Louis to Pennsylvania. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$82 | Average$219 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$141 | Average$236 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$208 | Average$351 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$231 | Average$380 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$235 | Average$409 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$260 | Average$367 | FlexibilityNo cancel fee | On-time69% |