$130 Cheap Flights from St. Louis (STL) to Portland (PWM)

View $130 flight on Sat, May 3, 2025Opens in a new window

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Cheap Flights from St. Louis to Portland (STL-PWM)

Prices were available within the past 7 days and start at $130 for one-way flights and $188 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, May 16 - Mon, May 19
STL
St. Louis
PWM
Portland
$188 Roundtrip, found 1 hour ago
$188
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Fri, May 16 from St. Louis to Portland, returning Mon, May 19, priced at $188 found 1 hour ago
Frontier Airlines
Wed, May 14 - Sat, May 17
STL
St. Louis
PWM
Portland
$198 Roundtrip, found 1 hour ago
$198
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Wed, May 14 from St. Louis to Portland, returning Sat, May 17, priced at $198 found 1 hour ago
Frontier Airlines
Thu, May 15 - Mon, May 19
STL
St. Louis
PWM
Portland
$208 Roundtrip, found 1 hour ago
$208
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Thu, May 15 from St. Louis to Portland, returning Mon, May 19, priced at $208 found 1 hour ago
Frontier Airlines
Sat, May 10 - Mon, May 19
STL
St. Louis
PWM
Portland
$210 Roundtrip, found 1 day ago
$210
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sat, May 10 from St. Louis to Portland, returning Mon, May 19, priced at $210 found 1 day ago
Frontier Airlines
Thu, May 15 - Sat, May 17
STL
St. Louis
PWM
Portland
$218 Roundtrip, found 1 hour ago
$218
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Thu, May 15 from St. Louis to Portland, returning Sat, May 17, priced at $218 found 1 hour ago
Frontier Airlines
Sat, May 10 - Sat, May 17
STL
St. Louis
PWM
Portland
$228 Roundtrip, found 4 hours ago
$228
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Sat, May 10 from St. Louis to Portland, returning Sat, May 17, priced at $228 found 4 hours ago
Frontier Airlines
Fri, May 16 - Sat, May 31
STL
St. Louis
PWM
Portland
$230 Roundtrip, found 3 days ago
$230
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Fri, May 16 from St. Louis to Portland, returning Sat, May 31, priced at $230 found 3 days ago
Frontier Airlines
Sun, May 11 - Sat, May 17
STL
St. Louis
PWM
Portland
$238 Roundtrip, found 1 day ago
$238
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sun, May 11 from St. Louis to Portland, returning Sat, May 17, priced at $238 found 1 day ago
Frontier Airlines
Sun, May 11 - Fri, May 16
STL
St. Louis
PWM
Portland
$248 Roundtrip, found 1 day ago
$248
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sun, May 11 from St. Louis to Portland, returning Fri, May 16, priced at $248 found 1 day ago
Delta
Sat, May 24 - Sat, May 31
STL
St. Louis
PWM
Portland
$257 Roundtrip, found 6 days ago
$257
Roundtrip
found 6 days ago
Select Delta flight, departing Sat, May 24 from St. Louis to Portland, returning Sat, May 31, priced at $257 found 6 days ago

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM) cost?
Discover the latest flight deals from STL to PWM by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from STL to PWM?
The cheapest flights from STL to PWM are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from STL to PWM?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from STL to PWM. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM) aren’t available daily, so you’ll need to take a flight with a layover. Explore your options with Expedia’s filter tool. Enter your travel dates and select either “1 Stop” or “2+ Stops.”
What day of the week has the most flights from STL to PWM?
Generally you’ll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* However, this can vary based on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM)?
To arrive at Portland Intl. Jetport Airport (PWM) on schedule, book a flight that leaves from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM) last-minute?
Holding off until just before your departure to book a flight from STL to PWM often results in higher prices. While you may find some last-minute discounts, they’re not always guaranteed. Be flexible with your travel plans to boost your chances of snagging a bargain.
Is it cheaper to book a STL to PWM flight and hotel package?
You can save money by booking a STL to PWM flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it’s easy to manage everything in one convenient place. After selecting your ideal flights and accommodations, consider adding extras like car rentals, activities and tours.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM)?
You can usually reschedule or cancel your STL to PWM flight. However, if it’s been more than 24 hours since booking, additional charges may apply. Check your airline’s policies in your itinerary to see what changes are possible and whether any costs are involved. You’ll also find further details on our Customer Service portal.
*Available to One Key members.