$160+ Cheap flights from Portland, ME to St. Louis (PWM - 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 9/30. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — STL
Aug 22 — Aug 291
Round-trip
1 adult, Economy
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Find cheap flights from Portland 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
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Cheapest flights from Portland to St. LouisExplore the most affordable flight options available from Portland to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 23, 2026.
Explore the most affordable flight options available from Portland to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 23, 2026.
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/266:09 pm
PWM
- STL
1 stop15h 15m
American Airlines
Sat 8/295:00 am
STL
- PWM
1 stop9h 27m
American Airlines
Deal found 7/22![American Airlines logo]()
$321
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:46 pm
PWM
- STL
1 stop5h 48m
American Airlines
Tue 8/258:07 pm
STL
- PWM
1 stop14h 31m
American Airlines
Deal found 7/22![American Airlines logo]()
$327
This American Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 9/115:38 pm
PWM
- STL
1 stop7h 49m
American Airlines
Mon 9/1411:01 am
STL
- PWM
1 stop11h 46m
American Airlines
Deal found 7/23![American Airlines logo]()
$332
This American Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” 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 8/246:46 pm
PWM
- STL
1 stop5h 48m
American Airlines
Wed 8/265:57 pm
STL
- PWM
1 stop4h 50m
American Airlines
Deal found 7/21![American Airlines logo]()
$333
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 9/55:40 am
PWM
- STL
2 stops9h 20m
Southwest
Mon 9/72:20 pm
STL
- PWM
1 stop6h 10m
Southwest
Deal found 7/22![Southwest logo]()
$338
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” 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 9/111:05 pm
PWM
- STL
1 stop6h 20m
Southwest
Mon 9/1412:15 pm
STL
- PWM
2 stops9h 15m
Southwest
Deal found 7/23![Southwest logo]()
$343
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/110:30 am
PWM
- STL
2 stops9h 50m
Southwest
Thu 12/36:40 am
STL
- PWM
1 stop7h 10m
Southwest
Deal found 7/23![Southwest logo]()
$344
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/225:40 am
PWM
- STL
2 stops8h 45m
Southwest
Tue 8/2510:45 am
STL
- PWM
2 stops9h 25m
Southwest
Deal found 7/22![Southwest logo]()
$349
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 9/15:45 am
PWM
- STL
2 stops9h 10m
Southwest
Sat 9/52:55 pm
STL
- PWM
1 stop5h 05m
Southwest
Deal found 7/22![Southwest logo]()
$359
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/265:45 am
PWM
- STL
2 stops9h 10m
Southwest
Sat 8/296:30 am
STL
- PWM
2 stops7h 30m
Southwest
Deal found 7/22![Southwest logo]()
$364
Best flights from Portland to St. LouisDiscover carefully curated flight deals from Portland to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 23, 2026.
Discover carefully curated flight deals from Portland to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 23, 2026.
This United Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” 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 9/57:40 am
PWM
- STL
1 stop5h 23m
United Airlines
Mon 9/73:32 pm
STL
- PWM
1 stop4h 51m
United Airlines
Deal found 7/21![United Airlines logo]()
$333
This Southwest deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” 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 9/55:40 am
PWM
- STL
2 stops9h 20m
Southwest
Mon 9/72:20 pm
STL
- PWM
1 stop6h 10m
Southwest
Deal found 7/21![Southwest logo]()
$338
This Delta deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/2711:01 am
PWM
- STL
1 stop5h 37m
Delta
Sun 8/307:00 am
STL
- PWM
1 stop5h 07m
Delta
Deal found 7/19![Delta logo]()
$401
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/110:30 am
PWM
- STL
2 stops9h 50m
Southwest
Thu 12/36:40 am
STL
- PWM
1 stop7h 10m
Southwest
Deal found 7/23![Southwest logo]()
$344
This Southwest deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” 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 9/113:40 pm
PWM
- STL
2 stops7h 25m
Southwest
Mon 9/1412:15 pm
STL
- PWM
2 stops9h 10m
Southwest
Deal found 7/20![Southwest logo]()
$364
This United Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 9/56:03 am
PWM
- STL
1 stop5h 09m
United Airlines
Wed 9/98:00 am
STL
- PWM
1 stop5h 31m
United Airlines
Deal found 7/22![United Airlines logo]()
$423
This Southwest deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” 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 11/1812:50 pm
PWM
- STL
1 stop6h 10m
Southwest
Fri 11/2710:15 am
STL
- PWM
1 stop5h 15m
Southwest
Deal found 7/20![Southwest logo]()
$380
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/236:30 am
PWM
- STL
2 stops11h 30m
Southwest
Mon 10/265:40 pm
STL
- PWM
1 stop5h 15m
Southwest
Deal found 7/23![Southwest logo]()
$390
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 12/412:50 pm
PWM
- STL
1 stop6h 10m
Southwest
Tue 12/86:20 am
STL
- PWM
2 stops7h 30m
Southwest
Deal found 7/22![Southwest logo]()
$390
This Southwest deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/185:45 am
PWM
- STL
2 stops7h 25m
Southwest
Mon 8/242:45 pm
STL
- PWM
2 stops6h 40m
Southwest
Deal found 7/19![Southwest logo]()
$411
Last-minute flights from Portland to St. LouisDiscover last-minute flight deals from Portland to St. Louis. Data last updated July 23, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to St. Louis. Data last updated July 23, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/147:05 am
PWM
- STL
1 stop6h 57m
American Airlines
Tue 8/181:25 pm
STL
- PWM
1 stop8h 23m
American Airlines
Deal found 7/22![American Airlines logo]()
$384
This American Airlines deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/156:46 pm
PWM
- STL
1 stop5h 48m
American Airlines
Sat 8/2210:22 am
STL
- PWM
1 stop6h 19m
American Airlines
Deal found 7/20![American Airlines logo]()
$375
This Southwest deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/185:45 am
PWM
- STL
1 stop5h 20m
Southwest
Mon 8/2412:15 pm
STL
- PWM
2 stops9h 10m
Southwest
Deal found 7/19![Southwest logo]()
$380
This Southwest deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” 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 8/215:55 am
PWM
- STL
1 stop6h 40m
Southwest
Mon 8/2412:15 pm
STL
- PWM
2 stops9h 10m
Southwest
Deal found 7/20![Southwest logo]()
$385
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:46 pm
PWM
- STL
1 stop5h 48m
American Airlines
Tue 8/258:07 pm
STL
- PWM
1 stop14h 31m
American Airlines
Deal found 7/22![American Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/225:40 am
PWM
- STL
2 stops8h 45m
Southwest
Tue 8/255:55 am
STL
- PWM
1 stop5h 30m
Southwest
Deal found 7/22![Southwest logo]()
$338
This American Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” 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 8/246:46 pm
PWM
- STL
1 stop5h 48m
American Airlines
Wed 8/265:57 pm
STL
- PWM
1 stop4h 50m
American Airlines
Deal found 7/21![American Airlines logo]()
$333
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/266:09 pm
PWM
- STL
1 stop15h 15m
American Airlines
Sat 8/295:00 am
STL
- PWM
1 stop9h 27m
American Airlines
Deal found 7/22![American Airlines logo]()
$321
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/265:45 am
PWM
- STL
2 stops9h 10m
Southwest
Sat 8/296:30 am
STL
- PWM
2 stops7h 30m
Southwest
Deal found 7/22![Southwest logo]()
$364
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 8/2712:09 pm
PWM
- STL
1 stop13h 05m
American Airlines
Sun 8/304:54 pm
STL
- PWM
1 stop4h 54m
American Airlines
Deal found 7/22![American Airlines logo]()
$374
One-way flights from Portland to St. LouisSearch for one-way flight options from Portland to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 23, 2026.
Search for one-way flight options from Portland to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 9/305:09 pm
PWM
- STL
3 stops41h 31m
Multiple Airlines
Deal found 7/22![Multiple Airlines logo]()
$160
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 9/302:03 pm
PWM
- STL
1 stop11h 24m
American Airlines
Deal found 7/22![American Airlines logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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 10/263:53 pm
PWM
- STL
2 stops42h 47m
Multiple Airlines
Deal found 7/18![Multiple Airlines logo]()
$181
This United Airlines deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” 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 8/186:53 pm
PWM
- STL
1 stop5h 45m
United Airlines
Deal found 7/20![United Airlines logo]()
$188
This Kiwi.com deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” 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 8/237:00 am
PWM
- STL
3 stops35h 22m
Multiple Airlines
Deal found 7/21![Multiple Airlines logo]()
$191
This United Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” 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 9/305:08 pm
PWM
- STL
1 stop6h 51m
United Airlines
Deal found 7/22![United Airlines logo]()
$212
This Delta deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 12/256:00 am
PWM
- STL
1 stop7h 57m
Delta
Deal found 7/19![Delta logo]()
$214
This Southwest deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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 10/255:40 am
PWM
- STL
2 stops8h 20m
Southwest
Deal found 7/18![Southwest logo]()
$219
This Southwest deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” 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 8/185:45 am
PWM
- STL
2 stops7h 25m
Southwest
Deal found 7/20![Southwest logo]()
$225
This Kiwi.com deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” 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 8/184:44 pm
PWM
- STL
3 stops51h 29m
Multiple Airlines
Deal found 7/20![Multiple Airlines logo]()
$242
Find flight deals from Portland to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $321 (American Airlines) |
One-way from | $160 (Kiwi.com) |
Popular in | April |
Cheapest in | March |
Average price | $552 |
Cheapflights Fare Finder
Customize your flight search to find flights from Portland 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 July 23, 2026.
Use the filters below to find and compare flights from Portland to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Sat 9/5
7:40 am-12:03 pm
1 stop5h 23m
Lambert-St Louis
Mon 9/7
3:32 pm-9:23 pm
1 stop4h 51m
$333
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Sat 9/5
5:40 am-2:00 pm
2 stops9h 20m
Lambert-St Louis
Mon 9/7
2:20 pm-9:30 pm
1 stop6h 10m
$338
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Tue 12/1
10:30 am-7:20 pm
2 stops9h 50m
Lambert-St Louis
Thu 12/3
6:40 am-2:50 pm
1 stop7h 10m
$344
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Fri 9/11
3:40 pm-10:05 pm
2 stops7h 25m
Lambert-St Louis
Mon 9/14
12:15 pm-10:25 pm
2 stops9h 10m
$364
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Wed 11/18
12:50 pm-6:00 pm
1 stop6h 10m
Lambert-St Louis
Fri 11/27
10:15 am-4:30 pm
1 stop5h 15m
$380
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Fri 10/23
6:30 am-5:00 pm
2 stops11h 30m
Lambert-St Louis
Mon 10/26
5:40 pm-11:55 pm
1 stop5h 15m
$390
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Fri 12/4
12:50 pm-6:00 pm
1 stop6h 10m
Lambert-St Louis
Tue 12/8
6:20 am-2:50 pm
2 stops7h 30m
$390
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Thu 8/27
11:01 am-3:38 pm
1 stop5h 37m
Lambert-St Louis
Sun 8/30
7:00 am-1:07 pm
1 stop5h 07m
$401
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Tue 8/18
5:45 am-12:10 pm
2 stops7h 25m
Lambert-St Louis
Mon 8/24
2:45 pm-10:25 pm
2 stops6h 40m
$411
PortlandSt. Louis
PWM - STL
PWMSTL
Portland
Sat 9/5
6:03 am-10:12 am
1 stop5h 09m
Lambert-St Louis
Wed 9/9
8:00 am-2:31 pm
1 stop5h 31m
$423
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Portland to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to St. Louis in July.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Portland, Maine-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland, Maine-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland, Maine-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Portland, Maine-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland, Maine-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Portland to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Portland with our price prediction graph.
PWM-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 Portland to St. Louis
What is the cheapest month to book a flight from Portland, Maine to St. Louis?
Currently, March is the cheapest month in which you can book a flight from Portland, Maine to St. Louis (average of $354). Flying from Portland, Maine to St. Louis in April is currently the most expensive (average of $568). 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.
How much does it cost to fly round-trip from Portland, Maine to St. Louis?
Airfare is below average for this route at the moment.
Portland, Maine to St. Louis flights typically cost between $430 and $656 in August.The cheapest round-trip price found within the last 5 days was $321 on American Airlines (Aug 26-Aug 29).
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated July 23, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andAmerican Airlines from Portland to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Comfort
8.0
Food
7.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Related info for your journey
Find useful and relevant information for your journey from Portland 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
Fenton
Swansea
Fairview Heights
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington
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Portland and St. Louis flights
Browse other Portland and St. Louis flight options. Last updated on July 23, 2026.
Other flights from Portland
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Top 3 airlines flying from Portland to St. Louis
Discover the top 3 airlines that operate flights from Portland 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 July 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$407 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$314 | Average$446 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$348 | Average$576 | FlexibilityNo cancel fee | On-time63% |