$56+ Cheap flights from Pennsylvania to St. Louis (STL)
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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
Mar 5 — Mar 121
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 February 3, 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 February 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/243:00 pm
EWR
- STL
1 stop8h 27m
Multiple Airlines
Mon 3/28:22 pm
STL
- EWR
1 stop10h 43m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/36:00 pm
EWR
- STL
1 stop13h 51m
Multiple Airlines
Mon 3/92:09 pm
STL
- EWR
1 stop6h 21m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/43:00 pm
EWR
- STL
1 stop8h 27m
Multiple Airlines
Wed 3/1111:32 am
STL
- EWR
1 stop8h 58m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/2410:31 pm
EWR
- STL
1 stop9h 20m
Multiple Airlines
Wed 2/258:17 pm
STL
- EWR
1 stop10h 48m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:00 am
EWR
- STL
1 stop6h 49m
Frontier
Mon 3/92:09 pm
STL
- EWR
1 stop9h 54m
Frontier
Deal found 2/3![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:00 am
EWR
- STL
1 stop6h 49m
Frontier
Wed 3/1111:32 am
STL
- EWR
1 stop8h 58m
Frontier
Deal found 2/2![Frontier logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 2/2610:31 pm
EWR
- STL
1 stop9h 20m
Multiple Airlines
Mon 3/28:22 pm
STL
- EWR
1 stop10h 43m
Multiple Airlines
Deal found 1/31![Multiple Airlines logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/1910:45 pm
EWR
- STL
1 stop9h 06m
Multiple Airlines
Mon 2/238:22 pm
STL
- EWR
1 stop26h 07m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/36:00 pm
EWR
- STL
1 stop13h 51m
Multiple Airlines
Tue 3/104:51 pm
STL
- EWR
1 stop15h 09m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/175:15 am
EWR
- STL
1 stop26h 36m
Multiple Airlines
Fri 2/208:20 pm
STL
- EWR
1 stop10h 45m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/175:26 pm
PHL
- STL
2 stops14h 25m
Multiple Airlines
Tue 2/243:49 pm
STL
- PHL
1 stop21h 51m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/265:30 am
PHL
- STL
1 stop26h 21m
Frontier
Tue 3/33:49 pm
STL
- PHL
1 stop19h 33m
Frontier
Deal found 2/2![Frontier logo]()
$147
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 February 3, 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 February 3, 2026.
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/246:00 pm
PIT
- STL
1 stop3h 43m
Delta
Wed 2/257:10 am
STL
- PIT
1 stop4h 26m
Delta
Deal found 2/3![Delta logo]()
$205
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 5/78:40 am
PIT
- STL
1 stop5h 15m
Southwest
Mon 5/115:00 am
STL
- PIT
1 stop6h 00m
Southwest
Deal found 2/1![Southwest logo]()
$213
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/1711:27 am
MDT
- STL
2 stops20h 24m
Frontier
Sat 2/219:41 am
STL
- MDT
1 stop7h 45m
Frontier
Deal found 2/1![Frontier logo]()
$255
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/275:40 pm
MDT
- STL
1 stop4h 25m
United Airlines
Wed 3/49:55 am
STL
- MDT
1 stop5h 49m
United Airlines
Deal found 2/1![United Airlines logo]()
$260
This American Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/266:00 am
MDT
- STL
1 stop5h 03m
American Airlines
Wed 3/46:00 am
STL
- MDT
1 stop5h 01m
American Airlines
Deal found 2/2![American Airlines logo]()
$260
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 5/56:30 am
PIT
- STL
1 stop4h 12m
Delta
Mon 5/117:09 pm
STL
- PIT
1 stop4h 36m
Delta
Deal found 2/1![Delta logo]()
$213
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 5/66:05 am
PIT
- STL
2 stops7h 55m
Southwest
Mon 5/113:25 pm
STL
- PIT
1 stop6h 55m
Southwest
Deal found 2/1![Southwest logo]()
$218
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 5/67:46 pm
PIT
- STL
1 stop4h 48m
Delta
Mon 5/111:50 pm
STL
- PIT
1 stop4h 04m
Delta
Deal found 2/1![Delta logo]()
$213
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 4/239:00 am
ABE
- STL
1 stop15h 19m
Multiple Airlines
Sun 4/264:55 pm
STL
- ABE
2 stops26h 15m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$520
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 3/188:40 am
IAD
- STL
Nonstop2h 32m
United Airlines
Sat 3/217:00 pm
STL
- IAD
1 stop3h 59m
United Airlines
Deal found 1/31![United Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 4/176:43 pm
MDT
- STL
1 stop4h 34m
American Airlines
Mon 4/206:55 pm
STL
- MDT
1 stop4h 36m
American Airlines
Deal found 2/2![American Airlines logo]()
$269
This Southwest deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 4/133:35 pm
DCA
- STL
1 stop4h 05m
Southwest
Sat 4/1810:55 am
STL
- DCA
2 stops7h 00m
Southwest
Deal found 1/31![Southwest logo]()
$254
This American Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/136:31 pm
MDT
- STL
1 stop6h 04m
American Airlines
Mon 2/232:19 pm
STL
- MDT
1 stop6h 59m
American Airlines
Deal found 2/1![American Airlines logo]()
$269
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 3/49:58 pm
EWR
- STL
Nonstop3h 01m
United Airlines
Sat 3/77:41 am
STL
- EWR
1 stop5h 25m
United Airlines
Deal found 2/1![United Airlines logo]()
$269
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/246:00 am
MDT
- STL
1 stop4h 32m
Delta
Wed 3/46:00 am
STL
- MDT
1 stop4h 10m
Delta
Deal found 2/2![Delta logo]()
$260
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 4/2510:00 am
LGA
- STL
Nonstop2h 50m
Southwest
Sun 4/265:40 am
STL
- LGA
Nonstop2h 20m
Southwest
Deal found 2/1![Southwest logo]()
$271
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 4/166:54 am
PIT
- STL
1 stop5h 15m
American Airlines
Sun 4/195:46 am
STL
- PIT
1 stop4h 18m
American Airlines
Deal found 2/3![American Airlines logo]()
$272
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/286:00 am
MDT
- STL
1 stop4h 32m
Delta
Sat 3/75:01 pm
STL
- MDT
1 stop5h 26m
Delta
Deal found 2/2![Delta logo]()
$260
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 2/219:59 pm
EWR
- STL
Nonstop3h 00m
United Airlines
Mon 2/234:49 pm
STL
- EWR
1 stop5h 05m
United Airlines
Deal found 1/31![United Airlines logo]()
$290
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 3/206:00 am
LGA
- STL
Nonstop3h 00m
Southwest
Sat 3/217:40 pm
STL
- LGA
Nonstop2h 15m
Southwest
Deal found 2/1![Southwest logo]()
$271
This American Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/186:00 am
SCE
- STL
1 stop7h 33m
American Airlines
Sat 2/211:30 pm
STL
- SCE
1 stop6h 02m
American Airlines
Deal found 2/2![American Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 3/16:00 am
MDT
- STL
1 stop4h 32m
Delta
Sat 3/75:50 pm
STL
- MDT
1 stop4h 10m
Delta
Deal found 2/1![Delta logo]()
$260
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 6/136:00 am
PHL
- STL
1 stop16h 11m
United Airlines
Sat 7/47:30 am
STL
- PHL
1 stop16h 15m
United Airlines
Deal found 1/31![United Airlines logo]()
$291
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 5/66:05 am
PIT
- STL
1 stop6h 20m
Southwest
Sun 5/1010:15 am
STL
- PIT
1 stop3h 50m
Southwest
Deal found 2/1![Southwest logo]()
$275
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/306:30 am
JFK
- STL
1 stop5h 59m
American Airlines
Wed 4/16:00 am
STL
- JFK
1 stop7h 59m
American Airlines
Deal found 2/3![American Airlines logo]()
$285
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 3/25:55 pm
MDT
- STL
1 stop6h 41m
Delta
Sat 3/75:50 pm
STL
- MDT
1 stop4h 10m
Delta
Deal found 2/1![Delta logo]()
$260
This United Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/115:35 pm
IAD
- STL
Nonstop2h 38m
United Airlines
Tue 3/318:30 am
STL
- IAD
Nonstop2h 13m
United Airlines
Deal found 2/3![United Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/76:50 pm
LGA
- STL
Nonstop3h 00m
Southwest
Sun 3/86:30 am
STL
- LGA
Nonstop2h 20m
Southwest
Deal found 2/3![Southwest logo]()
$278
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/286:00 am
MDT
- STL
1 stop4h 32m
Delta
Thu 3/56:00 am
STL
- MDT
1 stop4h 16m
Delta
Deal found 2/2![Delta logo]()
$269
This United Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/112:00 pm
DCA
- STL
1 stop5h 00m
United Airlines
Wed 4/19:10 am
STL
- DCA
1 stop5h 28m
United Airlines
Deal found 2/3![United Airlines logo]()
$296
Last-minute flights from Pennsylvania to St. LouisDiscover last-minute flight deals from Pennsylvania to St. Louis. Data last updated February 3, 2026 and is based on user searches.
Discover last-minute flight deals from Pennsylvania to St. Louis. Data last updated February 3, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/175:15 am
EWR
- STL
1 stop26h 36m
Multiple Airlines
Fri 2/208:20 pm
STL
- EWR
1 stop10h 45m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/175:26 pm
PHL
- STL
2 stops14h 25m
Multiple Airlines
Tue 2/243:49 pm
STL
- PHL
1 stop21h 51m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/1910:45 pm
EWR
- STL
1 stop9h 06m
Multiple Airlines
Mon 2/238:22 pm
STL
- EWR
1 stop26h 07m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/243:00 pm
EWR
- STL
1 stop8h 27m
Multiple Airlines
Mon 3/28:22 pm
STL
- EWR
1 stop10h 43m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/2410:31 pm
EWR
- STL
1 stop9h 20m
Multiple Airlines
Wed 2/258:17 pm
STL
- EWR
1 stop10h 48m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 2/2610:31 pm
EWR
- STL
1 stop9h 20m
Multiple Airlines
Mon 3/28:22 pm
STL
- EWR
1 stop10h 43m
Multiple Airlines
Deal found 1/31![Multiple Airlines logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/265:30 am
PHL
- STL
1 stop26h 21m
Frontier
Tue 3/33:49 pm
STL
- PHL
1 stop19h 33m
Frontier
Deal found 2/2![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/36:00 pm
EWR
- STL
1 stop13h 51m
Multiple Airlines
Mon 3/92:09 pm
STL
- EWR
1 stop6h 21m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/36:00 pm
EWR
- STL
1 stop13h 51m
Multiple Airlines
Tue 3/104:51 pm
STL
- EWR
1 stop15h 09m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/43:00 pm
EWR
- STL
1 stop8h 27m
Multiple Airlines
Wed 3/1111:32 am
STL
- EWR
1 stop8h 58m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:00 am
EWR
- STL
1 stop6h 49m
Frontier
Mon 3/92:09 pm
STL
- EWR
1 stop9h 54m
Frontier
Deal found 2/3![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:00 am
EWR
- STL
1 stop6h 49m
Frontier
Wed 3/1111:32 am
STL
- EWR
1 stop8h 58m
Frontier
Deal found 2/2![Frontier logo]()
$131
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 February 3, 2026.
Search for one-way flight options from Pennsylvania to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
This Trip.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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.
Tue 2/243:00 pm
EWR
- STL
1 stop8h 27m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$56
This Trip.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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.
Tue 3/35:59 am
EWR
- STL
1 stop25h 52m
Frontier
Deal found 2/1![Frontier logo]()
$59
This Trip.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/43:00 pm
EWR
- STL
1 stop8h 27m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$60
This Trip.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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.
Tue 2/175:59 am
EWR
- STL
1 stop25h 52m
Frontier
Deal found 2/1![Frontier logo]()
$61
This Trip.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/115:15 am
EWR
- STL
1 stop6h 22m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$62
This Trip.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/166:20 am
IAD
- STL
1 stop8h 14m
Frontier
Deal found 2/3![Frontier logo]()
$63
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/35:15 am
EWR
- STL
1 stop26h 36m
Multiple Airlines
Deal found 2/3![Multiple Airlines logo]()
$63
This Priceline deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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.
Wed 2/258:00 am
DCA
- STL
1 stop8h 53m
Frontier
Deal found 2/3![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/253:45 pm
PHL
- STL
1 stop7h 42m
Frontier
Deal found 2/1![Frontier logo]()
$64
This Trip.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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.
Fri 3/66:00 am
EWR
- STL
1 stop6h 49m
Frontier
Deal found 2/1![Frontier logo]()
$65
This WAYA deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:20 am
IAD
- STL
1 stop5h 17m
Frontier
Deal found 2/3![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/106:00 am
EWR
- STL
1 stop29h 37m
Frontier
Deal found 2/3![Frontier logo]()
$67
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 February 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $124 (Kiwi.com) |
One-way from | $56 (Trip.com) |
Popular in | May |
Cheapest in | August |
Average price | $431 |
Good round-trip deal | $343 or less |
Good one-way deal | $171 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 2,558,603 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from Pennsylvania to St. Louis that are best for you.
Fly from
Pennsylvania
Fly to
St. Louis
Route
Depart
Return
Price
PittsburghSt. Louis
PIT - STL
PITSTL
Pittsburgh
Tue 2/24
6:00 pm-8:43 pm
1 stop3h 43m
Lambert-St Louis
Wed 2/25
7:10 am-12:36 pm
1 stop4h 26m
$205
PittsburghSt. Louis
PIT - STL
PITSTL
Pittsburgh
Thu 5/7
8:40 am-12:55 pm
1 stop5h 15m
Lambert-St Louis
Mon 5/11
5:00 am-12:00 pm
1 stop6h 00m
$213
PittsburghSt. Louis
PIT - STL
PITSTL
Pittsburgh
Tue 5/5
6:30 am-9:42 am
1 stop4h 12m
Lambert-St Louis
Mon 5/11
7:09 pm-12:45 am
1 stop4h 36m
$213
PittsburghSt. Louis
PIT - STL
PITSTL
Pittsburgh
Wed 5/6
7:46 pm-11:34 pm
1 stop4h 48m
Lambert-St Louis
Mon 5/11
1:50 pm-6:54 pm
1 stop4h 04m
$213
PittsburghSt. Louis
PIT - STL
PITSTL
Pittsburgh
Wed 5/6
6:05 am-1:00 pm
2 stops7h 55m
Lambert-St Louis
Mon 5/11
3:25 pm-11:20 pm
1 stop6h 55m
$218
Washington, D.C.St. Louis
DCA - STL
DCASTL
Washington, D.C. Reagan-National
Mon 4/13
3:35 pm-6:40 pm
1 stop4h 05m
Lambert-St Louis
Sat 4/18
10:55 am-6:55 pm
2 stops7h 00m
$254
HarrisburgSt. Louis
MDT - STL
MDTSTL
Harrisburg
Tue 2/17
11:27 am-6:51 am
2 stops20h 24m
Lambert-St Louis
Sat 2/21
9:41 am-6:26 pm
1 stop7h 45m
$255
HarrisburgSt. Louis
MDT - STL
MDTSTL
Harrisburg
Fri 2/27
5:40 pm-9:05 pm
1 stop4h 25m
Lambert-St Louis
Wed 3/4
9:55 am-4:44 pm
1 stop5h 49m
$260
HarrisburgSt. Louis
MDT - STL
MDTSTL
Harrisburg
Thu 2/26
6:00 am-10:03 am
1 stop5h 03m
Lambert-St Louis
Wed 3/4
6:00 am-12:01 pm
1 stop5h 01m
$260
HarrisburgSt. Louis
MDT - STL
MDTSTL
Harrisburg
Tue 2/24
6:00 am-9:32 am
1 stop4h 32m
Lambert-St Louis
Wed 3/4
6:00 am-11:10 am
1 stop4h 10m
$260
Showing 1-10 of 60 results
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.
PHL-STL
DCA-STL
IAD-STL
PIT-STL
EWR-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
PHL-STL
DCA-STL
IAD-STL
PIT-STL
What is the cheapest month to book a flight from Pennsylvania to St. Louis?
Currently, November is the cheapest month in which you can book a flight from Pennsylvania to St. Louis (average of $156). Flying from Pennsylvania to St. Louis in March is currently the most expensive (average of $240). 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 February 3, 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 15% versus a flight in the morning.
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 January 31, 2026.
Travelers seeking maximum savings on their Pennsylvania to St. Louis flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Pennsylvania to St. Louis
Explore weekly flight availability from Pennsylvania to St. Louis. 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 February 3, 2026.
The most flights from USPA to STL are scheduled on a Tuesday (6 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).
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 locationsEdwardsville
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus
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 February 3, 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 February 3, 2026.
Pennsylvania to St. Louis flights
Consider these flights traveling from Pennsylvania to St. Louis.
Top 6 airlines flying from Pennsylvania to St. Louis
Discover the top 6 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 2,558,603 searches. Data last updated February 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$95 | Average$178 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$127 | Average$212 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$170 | Average$343 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$241 | Average$381 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$372 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$248 | Average$338 | FlexibilityNo cancel fee | On-timeN/A |