$131 Cheap Flights from St. Louis (STL) to Portland (PWM)

View $131 flight on Fri, Oct 31, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM)

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

Prices were available within the past 7 days and start at $131 for one-way flights and $294 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Nov 20 - Mon, Nov 24
STL
St. Louis
PWM
Portland
$294 Roundtrip, found 1 day ago
$294
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Nov 20 from St. Louis to Portland, returning Mon, Nov 24, priced at $294 found 1 day ago
United
Tue, Jan 20 - Tue, Jan 27
STL
St. Louis
PWM
Portland
$294 Roundtrip, found 1 day ago
$294
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jan 20 from St. Louis to Portland, returning Tue, Jan 27, priced at $294 found 1 day ago
United
Tue, Jan 20 - Tue, Jan 27
STL
St. Louis
PWM
Portland
$296 Roundtrip, found 1 day ago
$296
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jan 20 from St. Louis to Portland, returning Tue, Jan 27, priced at $296 found 1 day ago
American Airlines
Mon, Nov 17 - Mon, Nov 24
STL
St. Louis
PWM
Portland
$298 Roundtrip, found 4 days ago
$298
Roundtrip
found 4 days ago
Select American Airlines flight, departing Mon, Nov 17 from St. Louis to Portland, returning Mon, Nov 24, priced at $298 found 4 days ago
United
Tue, Jan 20 - Tue, Jan 27
STL
St. Louis
PWM
Portland
$299 Roundtrip, found 1 day ago
$299
Roundtrip
found 1 day ago
Select United flight, departing Tue, Jan 20 from St. Louis to Portland, returning Tue, Jan 27, priced at $299 found 1 day ago
United
Mon, Nov 17 - Mon, Nov 24
STL
St. Louis
PWM
Portland
$313 Roundtrip, found 4 days ago
$313
Roundtrip
found 4 days ago
Select United flight, departing Mon, Nov 17 from St. Louis to Portland, returning Mon, Nov 24, priced at $313 found 4 days ago
United
Fri, Oct 31 - Tue, Nov 4
STL
St. Louis
PWM
Portland
$314 Roundtrip, found 6 days ago
$314
Roundtrip
found 6 days ago
Select United flight, departing Fri, Oct 31 from St. Louis to Portland, returning Tue, Nov 4, priced at $314 found 6 days ago
United
Mon, Nov 17 - Mon, Nov 24
STL
St. Louis
PWM
Portland
$318 Roundtrip, found 4 days ago
$318
Roundtrip
found 4 days ago
Select United flight, departing Mon, Nov 17 from St. Louis to Portland, returning Mon, Nov 24, priced at $318 found 4 days ago
Delta
Fri, Oct 31 - Mon, Nov 17
STL
St. Louis
PWM
Portland
$319 Roundtrip, found 9 hours ago
$319
Roundtrip
found 9 hours ago
Select Delta flight, departing Fri, Oct 31 from St. Louis to Portland, returning Mon, Nov 17, priced at $319 found 9 hours ago
Southwest Airlines
Sat, Dec 6 - Sat, Jan 10
STL
St. Louis
PWM
Portland
$342 Roundtrip, found 5 days ago
$342
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Sat, Dec 6 from St. Louis to Portland, returning Sat, Jan 10, priced at $342 found 5 days ago

Find the cheapest month to fly from St. Louis (STL) to Portland (PWM)

September is typically the cheapest month to fly

From $182 - $392 per traveler.

Alternative airports near Portland

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Portland Intl. Jetport PWM. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $385
PWM
Portland Intl. Jetport
CheapestClosest
Average driving time to city center8 min
Flights from $385

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM) cost?
Grab a cheap one-way flight from $131 or cheap return flight from $294 from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM)?
November is the least expensive month to fly from STL to PWM. Planning your trip for the off-season is often the key to landing a great deal.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Jetport Airport (PWM)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest STL to PWM flight.
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.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Portland Intl. Jetport
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$293
Distance
1093 mi

Book with confidence

St. Louis to Portland Flights

The cheapest times to fly from St. Louis to Portland

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Portland are during the month of November. You can find some of the cheapest flights from St. Louis to Portland with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Portland

Sunday is one of the best days to book for cheap flights from St. Louis to Portland: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Portland

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Portland in 2025. You can also book with separate airlines for your outbound and return journeys, from $131 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Portland flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Portland airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Portland Flights

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*Available to One Key members.