$170+ 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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PWM
Feb 25 — Mar 41
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
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 St. Louis to Portland
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 January 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 January 26, 2026.
This Southwest deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:15 am
STL
- PWM
1 stop4h 40m
Southwest
Tue 3/174:30 pm
PWM
- STL
1 stop6h 45m
Southwest
Deal found 1/25![Southwest logo]()
$335
This American Airlines deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:37 am
STL
- PWM
1 stop6h 30m
American Airlines
Sun 3/17:00 am
PWM
- STL
1 stop6h 33m
American Airlines
Deal found 1/26![American Airlines logo]()
$337
This American Airlines deal was found by Cheapflights users on 1/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/85:59 pm
STL
- PWM
1 stop4h 44m
American Airlines
Thu 2/127:00 am
PWM
- STL
1 stop6h 33m
American Airlines
Deal found 1/24![American Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/86:35 am
STL
- PWM
1 stop4h 28m
Delta
Wed 2/1112:10 pm
PWM
- STL
2 stops12h 15m
Delta
Deal found 1/25![Delta logo]()
$344
This American Airlines deal was found by Cheapflights users on 1/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/129:37 am
STL
- PWM
1 stop6h 30m
American Airlines
Thu 2/197:10 am
PWM
- STL
1 stop6h 33m
American Airlines
Deal found 1/26![American Airlines logo]()
$352
This Delta deal was found by Cheapflights users on 1/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/216:32 am
STL
- PWM
1 stop4h 37m
Delta
Wed 3/256:03 am
PWM
- STL
1 stop7h 16m
Delta
Deal found 1/24![Delta logo]()
$371
This Southwest deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/95:40 am
STL
- PWM
2 stops7h 30m
Southwest
Mon 4/132:50 pm
PWM
- STL
2 stops9h 05m
Southwest
Deal found 1/25![Southwest logo]()
$377
This Delta deal was found by Cheapflights users on 1/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1110:50 am
STL
- PWM
2 stops8h 12m
Delta
Wed 4/224:42 pm
PWM
- STL
2 stops7h 52m
Delta
Deal found 1/25![Delta logo]()
$378
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 January 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | Expedia 3 stars |
Round-trip from | $335 (Southwest) |
One-way from | $170 (Delta) |
Popular in | January |
Cheapest in | December |
Average price | $582 |
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 January 26, 2026.
Use the filters below to find and compare flights from St. Louis to Portland that are best for you.
Fly from
St. Louis
Fly to
Portland
Route
Depart
Return
Price
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 4/15
6:48 am-12:05 pm
1 stop4h 17m
Portland
Wed 4/15
4:42 pm-8:42 pm
1 stop5h 00m
$335
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 3/11
6:15 am-11:55 am
1 stop4h 40m
Portland
Tue 3/17
4:30 pm-10:15 pm
1 stop6h 45m
$335
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sat 4/11
10:50 am-4:06 pm
1 stop4h 16m
Portland
Wed 4/22
4:42 pm-8:42 pm
1 stop5h 00m
$335
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sun 2/8
6:00 am-12:06 pm
1 stop5h 06m
Portland
Wed 2/11
12:46 pm-5:23 pm
1 stop5h 37m
$339
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Tue 3/17
1:39 pm-11:12 pm
2 stops8h 33m
Portland
Tue 3/24
5:23 am-11:09 am
1 stop6h 46m
$340
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sun 2/8
8:30 am-2:31 pm
1 stop5h 01m
Portland
Thu 2/12
6:00 am-4:02 pm
2 stops11h 02m
$344
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sun 2/8
6:35 am-12:03 pm
1 stop4h 28m
Portland
Wed 2/11
12:10 pm-11:25 pm
2 stops12h 15m
$344
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Thu 2/12
9:37 am-5:07 pm
1 stop6h 30m
Portland
Thu 2/19
7:10 am-12:43 pm
1 stop6h 33m
$352
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sat 2/7
6:35 am-12:08 pm
1 stop4h 33m
$170
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sun 3/1
6:35 am-12:00 pm
1 stop4h 25m
$200
Showing 1-10 of 16 results
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 January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star |
- 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 Expedia the most. Expedia 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.
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 January 23, 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 $175). Flying from St. Louis to Portland, Maine in March is currently the most expensive (average of $289). 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 January 26, 2026.
See what other customers who have flown with Southwest, Delta, and United 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.
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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
Conway
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for St. Louis to Portland
See prices for flight routes from nearby airports that may be better suited for you.
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 January 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$212 | Average$466 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$272 | Average$402 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$284 | Average$512 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$284 | Average$406 | FlexibilityNo cancel fee | On-time71% |