$174+ Cheap flights from St. Louis to Portland, ME (STL - PWM)
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 5/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PWM
Apr 9 — Apr 161
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Portland 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
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Best
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Cheapest flights from St. Louis to PortlandExplore the most affordable flight options available from St. Louis to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2026.
Explore the most affordable flight options available from St. Louis to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 10, 2026.
This American Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/48:00 am
STL
- PWM
1 stop8h 27m
American Airlines
Sat 4/117:07 am
PWM
- STL
1 stop14h 02m
American Airlines
Deal found 3/7![American Airlines logo]()
$321
This Delta deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/1310:50 am
STL
- PWM
1 stop4h 07m
Delta
Tue 4/145:21 am
PWM
- STL
1 stop6h 13m
Delta
Deal found 3/5![Delta logo]()
$323
This American Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 5/145:51 am
STL
- PWM
1 stop16h 31m
American Airlines
Tue 5/196:01 pm
PWM
- STL
1 stop6h 55m
American Airlines
Deal found 3/6![American Airlines logo]()
$344
This Delta deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/46:32 am
STL
- PWM
1 stop4h 37m
Delta
Sat 4/1112:51 pm
PWM
- STL
1 stop4h 49m
Delta
Deal found 3/5![Delta logo]()
$347
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/65:20 am
STL
- PWM
1 stop5h 35m
Southwest
Mon 4/132:50 pm
PWM
- STL
2 stops9h 05m
Southwest
Deal found 3/7![Southwest logo]()
$352
This Southwest deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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 5/106:50 pm
STL
- PWM
1 stop4h 15m
Southwest
Wed 5/133:55 pm
PWM
- STL
1 stop6h 10m
Southwest
Deal found 3/9![Southwest logo]()
$353
This Southwest deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/46:40 am
STL
- PWM
1 stop4h 50m
Southwest
Sat 4/1112:45 pm
PWM
- STL
2 stops8h 15m
Southwest
Deal found 3/5![Southwest logo]()
$362
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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 6/103:42 pm
STL
- PWM
1 stop7h 11m
Delta
Tue 6/236:00 am
PWM
- STL
1 stop7h 54m
Delta
Deal found 3/9![Delta logo]()
$363
This American Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 8/227:23 am
STL
- PWM
1 stop6h 37m
American Airlines
Sat 8/2912:04 pm
PWM
- STL
1 stop9h 15m
American Airlines
Deal found 3/6![American Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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 4/89:10 am
STL
- PWM
2 stops8h 27m
United Airlines
Wed 4/156:33 pm
PWM
- STL
1 stop5h 38m
United Airlines
Deal found 3/9![United Airlines logo]()
$367
Best flights from St. Louis to PortlandDiscover carefully curated flight deals from St. Louis to Portland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 10, 2026.
Discover carefully curated flight deals from St. Louis to Portland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 10, 2026.
This Delta deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/46:32 am
STL
- PWM
1 stop4h 37m
Delta
Sat 4/1112:51 pm
PWM
- STL
1 stop4h 49m
Delta
Deal found 3/5![Delta logo]()
$347
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 6/106:00 am
STL
- PWM
1 stop6h 25m
United Airlines
Thu 6/186:00 am
PWM
- STL
1 stop5h 34m
United Airlines
Deal found 3/8![United Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 6/103:15 pm
STL
- PWM
2 stops6h 40m
Southwest
Thu 6/183:10 pm
PWM
- STL
2 stops6h 50m
Southwest
Deal found 3/8![Southwest logo]()
$392
This Delta deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 6/105:30 pm
STL
- PWM
1 stop5h 23m
Delta
Tue 6/236:50 pm
PWM
- STL
1 stop5h 48m
Delta
Deal found 3/7![Delta logo]()
$377
This United Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 7/181:13 pm
STL
- PWM
1 stop7h 38m
United Airlines
Thu 7/236:00 am
PWM
- STL
1 stop7h 11m
United Airlines
Deal found 3/8![United Airlines logo]()
$407
This Southwest deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 8/246:05 am
STL
- PWM
1 stop5h 20m
Southwest
Mon 8/315:55 am
PWM
- STL
1 stop6h 40m
Southwest
Deal found 3/6![Southwest logo]()
$407
This United Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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.
Mon 7/136:01 am
STL
- PWM
1 stop6h 24m
United Airlines
Tue 7/144:51 pm
PWM
- STL
1 stop5h 25m
United Airlines
Deal found 3/7![United Airlines logo]()
$407
This Delta deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 8/256:45 am
STL
- PWM
1 stop4h 10m
Delta
Sat 8/291:35 pm
PWM
- STL
1 stop8h 15m
Delta
Deal found 3/6![Delta logo]()
$407
This Southwest deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 5/282:25 pm
STL
- PWM
2 stops8h 00m
Southwest
Mon 6/15:30 am
PWM
- STL
1 stop6h 20m
Southwest
Deal found 3/5![Southwest logo]()
$412
This Delta deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 6/185:30 pm
STL
- PWM
1 stop5h 23m
Delta
Mon 6/226:00 am
PWM
- STL
1 stop7h 54m
Delta
Deal found 3/6![Delta logo]()
$417
Last-minute flights from St. Louis to PortlandDiscover last-minute flight deals from St. Louis to Portland. Data last updated March 10, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Portland. Data last updated March 10, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/23:49 pm
STL
- PWM
1 stop7h 06m
American Airlines
Sun 4/55:40 pm
PWM
- STL
1 stop17h 23m
American Airlines
Deal found 3/8![American Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” 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 4/24:45 pm
STL
- PWM
1 stop6h 20m
Southwest
Sun 4/55:30 pm
PWM
- STL
2 stops7h 45m
Southwest
Deal found 3/8![Southwest logo]()
$392
This American Airlines deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/48:00 am
STL
- PWM
1 stop8h 27m
American Airlines
Sat 4/117:07 am
PWM
- STL
1 stop14h 02m
American Airlines
Deal found 3/7![American Airlines logo]()
$321
This Delta deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/46:32 am
STL
- PWM
1 stop4h 37m
Delta
Sat 4/1112:51 pm
PWM
- STL
1 stop4h 49m
Delta
Deal found 3/5![Delta logo]()
$347
This Southwest deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/46:40 am
STL
- PWM
1 stop4h 50m
Southwest
Sat 4/1112:45 pm
PWM
- STL
2 stops8h 15m
Southwest
Deal found 3/5![Southwest logo]()
$362
This Southwest deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 4/65:20 am
STL
- PWM
1 stop5h 35m
Southwest
Mon 4/132:50 pm
PWM
- STL
2 stops9h 05m
Southwest
Deal found 3/7![Southwest logo]()
$352
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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 4/711:15 am
STL
- PWM
1 stop5h 17m
United Airlines
Wed 4/87:12 pm
PWM
- STL
1 stop5h 45m
United Airlines
Deal found 3/9![United Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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 4/89:10 am
STL
- PWM
2 stops8h 27m
United Airlines
Wed 4/156:33 pm
PWM
- STL
1 stop5h 38m
United Airlines
Deal found 3/9![United Airlines logo]()
$367
This Delta deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/1310:50 am
STL
- PWM
1 stop4h 07m
Delta
Tue 4/145:21 am
PWM
- STL
1 stop6h 13m
Delta
Deal found 3/5![Delta logo]()
$323
This Delta deal was found by Cheapflights users on 3/5. Clicking the “Pick Dates” 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 4/1310:50 am
STL
- PWM
1 stop4h 07m
Delta
Thu 4/165:21 am
PWM
- STL
1 stop6h 13m
Delta
Deal found 3/5![Delta logo]()
$413
One-way flights from St. Louis to PortlandSearch for one-way flight options from St. Louis to Portland. Find affordable one-way fares based on user searches. Data last updated March 10, 2026.
Search for one-way flight options from St. Louis to Portland. Find affordable one-way fares based on user searches. Data last updated March 10, 2026.
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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 5/231:13 pm
STL
- PWM
1 stop7h 38m
United Airlines
Deal found 3/6![United Airlines logo]()
$174
This Delta deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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 6/185:30 pm
STL
- PWM
1 stop5h 23m
Delta
Deal found 3/9![Delta logo]()
$204
This American Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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 5/225:40 pm
STL
- PWM
1 stop5h 11m
American Airlines
Deal found 3/9![American Airlines logo]()
$224
This United Airlines deal was found by Cheapflights users on 3/6. Clicking the “Pick Dates” 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.
Sun 6/211:13 pm
STL
- PWM
2 stops9h 38m
United Airlines
Deal found 3/6![United Airlines logo]()
$225
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/181:13 pm
STL
- PWM
2 stops9h 38m
United Airlines
Deal found 3/9![United Airlines logo]()
$249
This Southwest deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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 4/64:25 pm
STL
- PWM
2 stops6h 40m
Southwest
Deal found 3/9![Southwest logo]()
$275
This United Airlines deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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.
Mon 4/279:10 am
STL
- PWM
1 stop7h 22m
United Airlines
Deal found 3/9![United Airlines logo]()
$285
This Kiwi.com deal was found by Cheapflights users on 3/7. Clicking the “Pick Dates” 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 5/238:08 pm
STL
- PWM
3 stops41h 01m
Multiple Airlines
Deal found 3/7![Multiple Airlines logo]()
$314
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” 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 5/2210:55 am
STL
- PWM
2 stops21h 17m
Multiple Airlines
Deal found 3/9![Multiple Airlines logo]()
$329
Find flight deals from St. Louis to Portland
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Portland (PWM). 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 March 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $321 (American Airlines) |
One-way from | $174 (United Airlines) |
Popular in | January |
Cheapest in | March |
Average price | $349 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Portland 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 March 10, 2026.
Use the filters below to find and compare flights from St. Louis to Portland that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sat 4/4
6:32 am-12:09 pm
1 stop4h 37m
Portland
Sat 4/11
12:51 pm-4:40 pm
1 stop4h 49m
$347
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 6/10
6:00 am-1:25 pm
1 stop6h 25m
Portland
Thu 6/18
6:00 am-10:34 am
1 stop5h 34m
$377
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 6/10
5:30 pm-11:53 pm
1 stop5h 23m
Portland
Tue 6/23
6:50 pm-11:38 pm
1 stop5h 48m
$377
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 6/10
3:15 pm-10:55 pm
2 stops6h 40m
Portland
Thu 6/18
3:10 pm-9:00 pm
2 stops6h 50m
$392
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sat 7/18
1:13 pm-9:51 pm
1 stop7h 38m
Portland
Thu 7/23
6:00 am-12:11 pm
1 stop7h 11m
$407
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Mon 8/24
6:05 am-12:25 pm
1 stop5h 20m
Portland
Mon 8/31
5:55 am-11:35 am
1 stop6h 40m
$407
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Mon 7/13
6:01 am-1:25 pm
1 stop6h 24m
Portland
Tue 7/14
4:51 pm-9:16 pm
1 stop5h 25m
$407
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Tue 8/25
6:45 am-11:55 am
1 stop4h 10m
Portland
Sat 8/29
1:35 pm-8:50 pm
1 stop8h 15m
$407
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Thu 5/28
2:25 pm-11:25 pm
2 stops8h 00m
Portland
Mon 6/1
5:30 am-10:50 am
1 stop6h 20m
$412
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Thu 6/18
5:30 pm-11:53 pm
1 stop5h 23m
Portland
Mon 6/22
6:00 am-12:54 pm
1 stop7h 54m
$417
Showing 1-10 of 19 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Portland
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 St. Louis to Portland in March.
| 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 St. Louis-Portland, Maine flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Portland, Maine flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Portland, Maine flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Portland, Maine 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 St. Louis-Portland, Maine 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 St. Louis to Portland
Have a flexible travel schedule? Discover the best time to fly to Portland from St. Louis with our price prediction graph.
STL-PWM
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 Portland
Prices
More
How far ahead should I book a flight from St. Louis to Portland, Maine?
Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Portland. Price data was last updated on March 6, 2026.
The price you pay for your flight from St. Louis to Portland, Maine may vary depending on when you book. For the best chance of a lower fare, look to book 58 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from St. Louis to Portland, Maine?
Currently, September is the cheapest month in which you can book a flight from St. Louis to Portland, Maine (average of $183). Flying from St. Louis to Portland, Maine in February is currently the most expensive (average of $362). 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’s the top layover airport for flights from St. Louis to Portland, Maine?
Share of 1-stop round-trip flights from St. Louis to Portland, Maine chosen by Cheapflights users in the past 12 months, using the same layover each way.
Baltimore (BWI) – chosen by Cheapflights users on 67% of 1-stop itineraries from St. Louis to Portland, Maine on Cheapflights.
What’s the cheapest layover airport for flights from St. Louis to Portland, Maine?
Average round-trip fare for 1-stop flights from St. Louis to Portland, Maine, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Baltimore (BWI) is the most affordable 1-stop option, with an average round-trip price of $295.
What’s the fastest layover option from St. Louis to Portland, Maine?
Shortest average travel time for 1-stop one-way flights from St. Louis to Portland, Maine, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Newark (EWR) have the shortest average one-way travel time for 1-stop routes: 4h 49m.
Which airport typically offers the quickest layover for flights from St. Louis to Portland, Maine?
Average layover duration for 1-stop one-way flights from St. Louis to Portland, Maine, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Newark (EWR) offer the fastest connection on this route, with an average layover time of 1h 08m.
Reviews of airlines servicing Portland
Get insights into the airlines that provide service to Portland. 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 Portland. Reviews last updated March 10, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from St. Louis to Portland have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Boarding
8.1
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentAnonymous,Mar 2026
KOA - HNL
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Portland. 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 Portland?
Book flights to Portland if you plan to visit one of these locationsNorth Conway
Brunswick
Auburn
Lewiston
Conway
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Top 4 airlines flying from St. Louis to Portland
Discover the top 4 airlines that operate flights from St. Louis to Portland. 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 March 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$212 | Average$472 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$272 | Average$405 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$284 | Average$482 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$284 | Average$406 | FlexibilityNo cancel fee | On-time71% |