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Find low faresSouthwest® flights from St. Louis to Portland, ME from $168
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Low fares from St. Louis to Portland, ME
$
St. Louis (STL)to
Portland, ME (PWM)
Depart: 04/01/2026
One-way
Basic
From
$168
Seen: 10 hrs ago
St. Louis (STL)to
Portland, ME (PWM)
Depart: 05/12/2026
One-way
Basic
From
$173
Seen: 8 hrs ago
St. Louis (STL)to
Portland, ME (PWM)
Depart: 03/02/2026
One-way
Basic
From
$175
Seen: 13 hrs ago
St. Louis (STL)to
Portland, ME (PWM)
Depart: 02/28/2026
One-way
Basic
From
$192
Seen: 15 hrs ago
St. Louis (STL)to
Portland, ME (PWM)
Depart: 03/27/2026
One-way
Basic
From
$204
Seen: 5 hrs ago
St. Louis (STL)to
Portland, ME (PWM)
Depart: 04/01/2026
One-way
Choice
From
$208
Seen: 10 hrs ago
Explore flights from St. Louis to Portland, ME
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Flight Details
Departing from:
Lambert-St Louis Int'l Airport
Arriving at:
Portland International Jetport
Distance:
1096 miles
Route Information
83† Weekly flights
† Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.
‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.
Questions we hear the most
There are 83 weekly flights from St. Louis to Portland, ME on Southwest Airlines.
To find the lowest fares by day and time to fly St. Louis to Portland, ME with Southwest, check out our Low Fare Calendar.
You can rent a car at Portland International Jetport book yours with your flight.
Yes! Flights from St. Louis to Portland, ME—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
Check the status of your upcoming Southwest flight.
Check out the Southwest Airlines® Help Center for answers about everything Southwest.