$138+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PWM
Jul 13 — Jul 201
Round-trip
1 adult, Economy
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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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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 June 13, 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 June 13, 2026.
This Delta deal was found by Cheapflights users on 6/11. 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 8/183:39 pm
STL
- PWM
1 stop6h 34m
Delta
Tue 9/12:14 pm
PWM
- STL
1 stop5h 13m
Delta
Deal found 6/11![Delta logo]()
$275
This United Airlines deal was found by Cheapflights users on 6/11. 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 9/168:00 am
STL
- PWM
1 stop5h 31m
United Airlines
Wed 9/235:15 am
PWM
- STL
2 stops7h 42m
United Airlines
Deal found 6/11![United Airlines logo]()
$280
This Southwest deal was found by Cheapflights users on 6/11. 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 8/1812:50 pm
STL
- PWM
2 stops7h 20m
Southwest
Tue 9/17:45 am
PWM
- STL
1 stop4h 35m
Southwest
Deal found 6/11![Southwest logo]()
$281
This Southwest deal was found by Cheapflights users on 6/9. 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.
Wed 10/218:20 am
STL
- PWM
1 stop5h 35m
Southwest
Tue 10/275:50 am
PWM
- STL
2 stops8h 40m
Southwest
Deal found 6/9![Southwest logo]()
$282
This United Airlines deal was found by Cheapflights users on 6/9. 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 8/188:00 am
STL
- PWM
1 stop5h 34m
United Airlines
Mon 8/315:03 pm
PWM
- STL
1 stop5h 57m
United Airlines
Deal found 6/9![United Airlines logo]()
$304
This Delta deal was found by Cheapflights users on 6/9. 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 9/25:25 pm
STL
- PWM
1 stop5h 05m
Delta
Sun 9/66:30 am
PWM
- STL
1 stop6h 17m
Delta
Deal found 6/9![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 6/8. 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.
Tue 9/13:45 pm
STL
- PWM
1 stop5h 20m
Southwest
Thu 9/1010:30 am
PWM
- STL
2 stops8h 25m
Southwest
Deal found 6/8![Southwest logo]()
$309
This Southwest deal was found by Cheapflights users on 6/9. 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.
Tue 10/2011:50 am
STL
- PWM
2 stops8h 40m
Southwest
Mon 10/266:30 am
PWM
- STL
1 stop6h 35m
Southwest
Deal found 6/9![Southwest logo]()
$310
This American Airlines deal was found by Cheapflights users on 6/10. 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 8/46:00 am
STL
- PWM
1 stop5h 37m
American Airlines
Mon 8/106:46 pm
PWM
- STL
1 stop5h 48m
American Airlines
Deal found 6/10![American Airlines logo]()
$322
This Delta deal was found by Cheapflights users on 6/9. 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 8/129:15 am
STL
- PWM
2 stops14h 44m
Delta
Tue 8/256:05 am
PWM
- STL
1 stop6h 41m
Delta
Deal found 6/9![Delta logo]()
$325
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 June 13, 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 June 13, 2026.
This Southwest deal was found by Cheapflights users on 6/9. 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.
Sat 8/226:45 am
STL
- PWM
1 stop7h 15m
Southwest
Tue 8/255:45 am
PWM
- STL
1 stop5h 20m
Southwest
Deal found 6/9![Southwest logo]()
$304
This Delta deal was found by Cheapflights users on 6/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/236:00 am
STL
- PWM
1 stop6h 07m
Delta
Wed 8/266:30 am
PWM
- STL
1 stop6h 17m
Delta
Deal found 6/8![Delta logo]()
$427
This United Airlines deal was found by Cheapflights users on 6/12. 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 7/296:00 am
STL
- PWM
2 stops12h 27m
United Airlines
Tue 8/46:00 am
PWM
- STL
1 stop7h 11m
United Airlines
Deal found 6/12![United Airlines logo]()
$428
This Southwest deal was found by Cheapflights users on 6/11. 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 9/166:30 am
STL
- PWM
2 stops9h 45m
Southwest
Wed 9/235:45 am
PWM
- STL
2 stops7h 25m
Southwest
Deal found 6/11![Southwest logo]()
$362
This Southwest deal was found by Cheapflights users on 6/10. 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 7/174:35 pm
STL
- PWM
2 stops6h 35m
Southwest
Wed 7/225:30 am
PWM
- STL
1 stop7h 00m
Southwest
Deal found 6/10![Southwest logo]()
$388
This Southwest deal was found by Cheapflights users on 6/12. 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 8/2712:55 pm
STL
- PWM
2 stops8h 30m
Southwest
Mon 8/315:55 am
PWM
- STL
2 stops10h 15m
Southwest
Deal found 6/12![Southwest logo]()
$437
This Southwest deal was found by Cheapflights users on 6/10. 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 8/22:10 pm
STL
- PWM
2 stops9h 00m
Southwest
Thu 8/65:55 am
PWM
- STL
2 stops10h 15m
Southwest
Deal found 6/10![Southwest logo]()
$443
This Southwest deal was found by Cheapflights users on 6/9. 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.
Fri 9/42:45 pm
STL
- PWM
2 stops6h 40m
Southwest
Sun 9/65:15 pm
PWM
- STL
1 stop5h 40m
Southwest
Deal found 6/9![Southwest logo]()
$458
This Southwest deal was found by Cheapflights users on 6/12. 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 7/65:20 pm
STL
- PWM
1 stop5h 50m
Southwest
Sat 7/115:35 am
PWM
- STL
2 stops8h 20m
Southwest
Deal found 6/12![Southwest logo]()
$462
This Southwest deal was found by Cheapflights users on 6/10. 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 8/410:45 am
STL
- PWM
2 stops9h 25m
Southwest
Sat 8/85:40 am
PWM
- STL
2 stops7h 55m
Southwest
Deal found 6/10![Southwest logo]()
$477
Last-minute flights from St. Louis to PortlandDiscover last-minute flight deals from St. Louis to Portland. Data last updated June 13, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Portland. Data last updated June 13, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 6/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/2910:20 am
STL
- PWM
1 stop4h 35m
Delta
Fri 7/36:57 pm
PWM
- STL
1 stop5h 59m
Delta
Deal found 6/8![Delta logo]()
$393
This American Airlines deal was found by Cheapflights users on 6/10. 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 6/295:08 am
STL
- PWM
1 stop5h 20m
American Airlines
Fri 7/37:24 pm
PWM
- STL
1 stop5h 52m
American Airlines
Deal found 6/10![American Airlines logo]()
$423
This Delta deal was found by Cheapflights users on 6/12. 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 6/3010:51 am
STL
- PWM
1 stop6h 01m
Delta
Fri 7/311:48 am
PWM
- STL
1 stop5h 58m
Delta
Deal found 6/12![Delta logo]()
$369
This Southwest deal was found by Cheapflights users on 6/11. 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 7/33:35 pm
STL
- PWM
2 stops7h 30m
Southwest
Tue 7/75:30 am
PWM
- STL
1 stop7h 00m
Southwest
Deal found 6/11![Southwest logo]()
$371
This Delta deal was found by Cheapflights users on 6/9. 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.
Tue 7/73:58 pm
STL
- PWM
1 stop6h 16m
Delta
Tue 7/146:59 pm
PWM
- STL
1 stop5h 54m
Delta
Deal found 6/9![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 6/8. 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.
Sat 7/112:30 pm
STL
- PWM
1 stop5h 35m
Southwest
Tue 7/147:10 pm
PWM
- STL
1 stop4h 55m
Southwest
Deal found 6/8![Southwest logo]()
$383
This Southwest deal was found by Cheapflights users on 6/12. 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 7/144:00 pm
STL
- PWM
1 stop4h 35m
Southwest
Tue 7/217:10 pm
PWM
- STL
1 stop4h 55m
Southwest
Deal found 6/12![Southwest logo]()
$333
This Southwest deal was found by Cheapflights users on 6/10. 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 7/213:15 pm
STL
- PWM
2 stops6h 45m
Southwest
Tue 7/285:30 am
PWM
- STL
1 stop7h 00m
Southwest
Deal found 6/10![Southwest logo]()
$344
This American Airlines deal was found by Cheapflights users on 6/12. 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 7/296:00 am
STL
- PWM
1 stop5h 35m
American Airlines
Tue 8/45:45 am
PWM
- STL
1 stop5h 16m
American Airlines
Deal found 6/12![American Airlines logo]()
$354
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 June 13, 2026.
Search for one-way flight options from St. Louis to Portland. Find affordable one-way fares based on user searches. Data last updated June 13, 2026.
This Delta deal was found by Cheapflights users on 6/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/141:30 pm
STL
- PWM
1 stop7h 53m
Delta
Deal found 6/8![Delta logo]()
$138
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 8/285:33 pm
STL
- PWM
2 stops21h 43m
Multiple Airlines
Deal found 6/10![Multiple Airlines logo]()
$181
This American Airlines deal was found by Cheapflights users on 6/12. 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 8/157:27 am
STL
- PWM
1 stop6h 40m
American Airlines
Deal found 6/12![American Airlines logo]()
$188
This Southwest deal was found by Cheapflights users on 6/12. 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 10/156:35 am
STL
- PWM
1 stop9h 20m
Southwest
Deal found 6/12![Southwest logo]()
$193
This Delta deal was found by Cheapflights users on 6/10. 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 8/285:25 pm
STL
- PWM
1 stop5h 05m
Delta
Deal found 6/10![Delta logo]()
$195
This Kiwi.com deal was found by Cheapflights users on 6/12. 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 8/154:57 pm
STL
- PWM
2 stops39h 15m
Multiple Airlines
Deal found 6/12![Multiple Airlines logo]()
$200
This American Airlines deal was found by Cheapflights users on 6/10. 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 7/209:25 am
STL
- PWM
1 stop6h 44m
American Airlines
Deal found 6/10![American Airlines logo]()
$214
This Southwest deal was found by Cheapflights users on 6/7. 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.
Fri 7/104:35 pm
STL
- PWM
2 stops6h 35m
Southwest
Deal found 6/7![Southwest logo]()
$219
This Delta deal was found by Cheapflights users on 6/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/2510:19 am
STL
- PWM
1 stop4h 42m
Delta
Deal found 6/8![Delta logo]()
$224
This American Airlines deal was found by Cheapflights users on 6/11. 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 7/109:25 am
STL
- PWM
1 stop6h 44m
American Airlines
Deal found 6/11![American Airlines logo]()
$233
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 June 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $275 (Delta) |
One-way from | $138 (Delta) |
Popular in | January |
Cheapest in | November |
Average price | $452 |
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 June 13, 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
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sat 8/22
6:45 am-3:00 pm
1 stop7h 15m
Portland
Tue 8/25
5:45 am-10:05 am
1 stop5h 20m
$304
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 9/16
6:30 am-5:15 pm
2 stops9h 45m
Portland
Wed 9/23
5:45 am-12:10 pm
2 stops7h 25m
$362
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Fri 7/17
4:35 pm-12:10 am
2 stops6h 35m
Portland
Wed 7/22
5:30 am-11:30 am
1 stop7h 00m
$388
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sun 8/23
6:00 am-1:07 pm
1 stop6h 07m
Portland
Wed 8/26
6:30 am-11:47 am
1 stop6h 17m
$427
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 7/29
6:00 am-7:27 pm
2 stops12h 27m
Portland
Tue 8/4
6:00 am-12:11 pm
1 stop7h 11m
$428
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Thu 8/27
12:55 pm-10:25 pm
2 stops8h 30m
Portland
Mon 8/31
5:55 am-3:10 pm
2 stops10h 15m
$437
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sun 8/2
2:10 pm-12:10 am
2 stops9h 00m
Portland
Thu 8/6
5:55 am-3:10 pm
2 stops10h 15m
$443
Quickest round-trip
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Fri 9/4
2:45 pm-10:25 pm
2 stops6h 40m
Portland
Sun 9/6
5:15 pm-9:55 pm
1 stop5h 40m
$458
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Mon 7/6
5:20 pm-12:10 am
1 stop5h 50m
Portland
Sat 7/11
5:35 am-12:55 pm
2 stops8h 20m
$462
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Tue 8/4
10:45 am-9:10 pm
2 stops9h 25m
Portland
Sat 8/8
5:40 am-12:35 pm
2 stops7h 55m
$477
Showing 1-10 of 20 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 June.
| 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?
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 45 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, November is the cheapest month in which you can book a flight from St. Louis to Portland, Maine (average of $326). 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?
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 June 13, 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
Crew
8.6
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Overall
7.9
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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
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 June 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$284 | Average$482 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$284 | Average$417 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$298 | Average$436 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$327 | Average$466 | FlexibilityNo cancel fee | On-time69% |