$178+ Cheap flights from St. Louis to Portland, ME (STL - PWM)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PWM
Nov 25 — Dec 21
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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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 St. Louis to Portland
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Best
Last-minute
One-way
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 October 26, 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 October 26, 2026.
This American Airlines deal was found by Cheapflights users on 10/22. 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 11/267:00 am -
1 stop7h 38m
Thu 12/35:00 am -
1 stop6h 08m
Deal found 10/22![American Airlines logo]()
$293
This Southwest deal was found by Cheapflights users on 10/22. 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.
Thu 11/269:40 am -
2 stops6h 30m
Thu 12/33:25 pm -
1 stop7h 50m
Deal found 10/22![Southwest logo]()
$298
This Southwest deal was found by Cheapflights users on 10/22. 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 12/55:45 am -
2 stops8h 00m
Tue 12/1512:45 pm -
2 stops7h 40m
Deal found 10/22![Southwest logo]()
$304
This American Airlines deal was found by Cheapflights users on 10/22. 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.
Tue 12/15:00 am -
1 stop5h 56m
Sat 12/122:57 pm -
1 stop5h 45m
Deal found 10/22![American Airlines logo]()
$319
This American Airlines deal was found by Cheapflights users on 10/22. 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.
Tue 11/175:00 am -
1 stop5h 28m
Fri 11/275:26 am -
1 stop5h 42m
Deal found 10/22![American Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/267:30 am -
1 stop5h 56m
Thu 12/39:38 am -
2 stops9h 38m
Deal found 10/24![United Airlines logo]()
$360
This American Airlines deal was found by Cheapflights users on 10/21. 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 11/96:00 am -
1 stop4h 53m
Fri 11/135:45 am -
1 stop7h 17m
Deal found 10/21![American Airlines logo]()
$366
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/211:00 pm -
1 stop5h 02m
Wed 11/255:08 pm -
1 stop5h 32m
Deal found 10/21![United Airlines logo]()
$374
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 October 26, 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 October 26, 2026.
This American Airlines deal was found by Cheapflights users on 10/22. 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 11/267:00 am -
1 stop7h 38m
Thu 12/35:00 am -
1 stop6h 08m
Deal found 10/22![American Airlines logo]()
$293
This United Airlines deal was found by Cheapflights users on 10/22. 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 12/58:30 am -
1 stop5h 07m
Tue 12/153:20 pm -
2 stops8h 39m
Deal found 10/22![United Airlines logo]()
$298
This Southwest deal was found by Cheapflights users on 10/22. 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 12/55:45 am -
2 stops8h 00m
Tue 12/1512:45 pm -
2 stops7h 40m
Deal found 10/22![Southwest logo]()
$304
This Southwest deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/269:00 am -
2 stops7h 10m
Thu 12/312:45 pm -
2 stops7h 40m
Deal found 10/24![Southwest logo]()
$366
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Tue 11/179:59 am -
2 stops8h 03m
Fri 11/276:00 am -
1 stop5h 48m
Deal found 10/22![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Tue 1/58:30 am -
1 stop5h 03m
Sat 1/169:10 am -
2 stops11h 18m
Deal found 10/21![United Airlines logo]()
$408
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 12/15:05 pm -
1 stop5h 19m
Tue 12/83:20 pm -
2 stops8h 39m
Deal found 10/24![United Airlines logo]()
$428
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Mon 11/97:30 am -
1 stop5h 46m
Fri 11/135:50 am -
2 stops10h 53m
Deal found 10/21![United Airlines logo]()
$469
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Tue 12/16:30 am -
2 stops7h 07m
Sat 12/124:47 pm -
1 stop5h 42m
Deal found 10/21![United Airlines logo]()
$469
Last-minute flights from St. Louis to PortlandDiscover last-minute flight deals from St. Louis to Portland. Data last updated October 26, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Portland. Data last updated October 26, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/21. 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.
Thu 11/57:30 am -
1 stop5h 46m
Mon 11/95:08 pm -
1 stop7h 16m
Deal found 10/21![United Airlines logo]()
$425
This American Airlines deal was found by Cheapflights users on 10/21. 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 11/96:00 am -
1 stop4h 53m
Fri 11/135:45 am -
1 stop7h 17m
Deal found 10/21![American Airlines logo]()
$366
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Mon 11/91:08 pm -
1 stop7h 43m
Thu 11/125:08 pm -
1 stop5h 32m
Deal found 10/22![United Airlines logo]()
$403
This American Airlines deal was found by Cheapflights users on 10/22. 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.
Tue 11/175:00 am -
1 stop5h 28m
Fri 11/275:26 am -
1 stop5h 42m
Deal found 10/22![American Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 10/22. 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.
Tue 11/179:59 am -
2 stops8h 03m
Fri 11/276:00 am -
1 stop5h 48m
Deal found 10/22![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 10/21. 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 11/211:00 pm -
1 stop5h 02m
Wed 11/255:08 pm -
1 stop5h 32m
Deal found 10/21![United Airlines logo]()
$374
This American Airlines deal was found by Cheapflights users on 10/22. 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 11/267:00 am -
1 stop7h 38m
Thu 12/35:00 am -
1 stop6h 08m
Deal found 10/22![American Airlines logo]()
$293
This Southwest deal was found by Cheapflights users on 10/22. 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.
Thu 11/269:40 am -
2 stops6h 30m
Thu 12/33:25 pm -
1 stop7h 50m
Deal found 10/22![Southwest logo]()
$298
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/267:30 am -
1 stop5h 56m
Thu 12/39:38 am -
2 stops9h 38m
Deal found 10/24![United Airlines logo]()
$360
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 October 26, 2026.
Search for one-way flight options from St. Louis to Portland. Find affordable one-way fares based on user searches. Data last updated October 26, 2026.
This American Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/96:02 am -
1 stop4h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![American Airlines logo]()
$178
This Kiwi.com deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/97:54 pm -
2 stops36h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Multiple Airlines logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/11:35 pm -
2 stops18h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Multiple Airlines logo]()
$330
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 October 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $293 (American Airlines) |
One-way from | $178 (American Airlines) |
Popular in | January |
Cheapest in | March |
Average price | $478 |
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 7,457,451 searches. Data last updated October 26, 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 Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Wed 12/9
6:02 am-11:58 am
1 stop4h 56m
Portland
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$178
St. LouisPortland
STL Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Wed 12/9
7:54 pm-9:08 am
2 stops36h 14m
Portland
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$182
St. LouisPortland
STL Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Thu 11/26
7:00 am-3:38 pm
1 stop7h 38m
Portland
Thu 12/3
5:00 am-10:08 am
1 stop6h 08m
$293
St. LouisPortland
STL Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Sat 12/5
8:30 am-2:37 pm
1 stop5h 07m
Portland
Tue 12/15
3:20 pm-10:59 pm
2 stops8h 39m
$298
St. LouisPortland
STL Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Sat 12/5
5:45 am-2:45 pm
2 stops8h 00m
Portland
Tue 12/15
12:45 pm-7:25 pm
2 stops7h 40m
$304
St. LouisPortland
STL Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Sun 11/1
1:35 pm-9:08 am
2 stops18h 33m
Portland
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$330
St. LouisPortland
STL Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Thu 11/26
9:00 am-5:10 pm
2 stops7h 10m
Portland
Thu 12/3
12:45 pm-7:25 pm
2 stops7h 40m
$366
St. LouisPortland
STL Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Tue 11/17
9:59 am-7:02 pm
2 stops8h 03m
Portland
Fri 11/27
6:00 am-10:48 am
1 stop5h 48m
$384
St. LouisPortland
STL Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Tue 1/5
8:30 am-2:33 pm
1 stop5h 03m
Portland
Sat 1/16
9:10 am-7:28 pm
2 stops11h 18m
$408
St. LouisPortland
STL Lambert-St Louis - PWM Portland
STLPWM
Lambert-St Louis
Tue 12/1
5:05 pm-11:24 pm
1 stop5h 19m
Portland
Tue 12/8
3:20 pm-10:59 pm
2 stops8h 39m
$428
Showing 1-10 of 12 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 October.
| 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
How far ahead should I book a flight from St. Louis to Portland, Maine?
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 16 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, March is the cheapest month in which you can book a flight from St. Louis to Portland, Maine (average of $349). Flying from St. Louis to Portland, Maine in January is currently the most expensive (average of $574). 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 St. Louis to Portland, Maine?
Airfare is below average for this route at the moment.
St. Louis to Portland, Maine flights typically cost between $375 and $468 in January.The cheapest round-trip price found within the last 5 days was $293 on American Airlines (Jan 5-Jan 16).
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 October 26, 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.
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Overall
7.9
Boarding
8.1
Food
7.0
Entertainment
7.4
Crew
8.6
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
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 locationsLewiston
North Conway
Brunswick
Conway
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St. Louis and Portland flights
Browse other St. Louis and Portland flight options. Last updated on October 26, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on October 26, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Portland
Explore flights to Portland departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 26, 2026.
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 7,457,451 searches. Data last updated October 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$303 | Average$427 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$306 | Average$429 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$327 | Average$465 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$366 | Average$492 | FlexibilityNo cancel fee | On-time63% |