$117 Cheap Flights from Portland (PWM) to St. Louis (STL)

View $117 flight on Tue, Dec 16, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $117 for one-way flights and $263 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Dec 16 - Tue, Jan 6
PWM
Portland
STL
St. Louis
$263 Roundtrip, found 6 days ago
$263
Roundtrip
found 6 days ago
Select Delta flight, departing Tue, Dec 16 from Portland to St. Louis, returning Tue, Jan 6, priced at $263 found 6 days ago
Delta
Mon, Nov 24 - Thu, Nov 27
PWM
Portland
STL
St. Louis
$281 Roundtrip, found 1 day ago
$281
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, Nov 24 from Portland to St. Louis, returning Thu, Nov 27, priced at $281 found 1 day ago
Delta
Sat, Jan 17 - Tue, Jan 27
PWM
Portland
STL
St. Louis
$285 Roundtrip, found 23 hours ago
$285
Roundtrip
found 23 hours ago
Select Delta flight, departing Sat, Jan 17 from Portland to St. Louis, returning Tue, Jan 27, priced at $285 found 23 hours ago
American Airlines
Wed, Jan 7 - Tue, Jan 20
PWM
Portland
STL
St. Louis
$290 Roundtrip, found 2 days ago
$290
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Jan 7 from Portland to St. Louis, returning Tue, Jan 20, priced at $290 found 2 days ago
Delta
Tue, Dec 16 - Wed, Dec 24
PWM
Portland
STL
St. Louis
$290 Roundtrip, found 6 days ago
$290
Roundtrip
found 6 days ago
Select Delta flight, departing Tue, Dec 16 from Portland to St. Louis, returning Wed, Dec 24, priced at $290 found 6 days ago
United
Wed, Jan 7 - Tue, Jan 20
PWM
Portland
STL
St. Louis
$292 Roundtrip, found 2 days ago
$292
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 7 from Portland to St. Louis, returning Tue, Jan 20, priced at $292 found 2 days ago
Delta
Sat, Jan 17 - Fri, Jan 30
PWM
Portland
STL
St. Louis
$292 Roundtrip, found 23 hours ago
$292
Roundtrip
found 23 hours ago
Select Delta flight, departing Sat, Jan 17 from Portland to St. Louis, returning Fri, Jan 30, priced at $292 found 23 hours ago
Delta
Sat, Jan 17 - Sun, Jan 25
PWM
Portland
STL
St. Louis
$294 Roundtrip, found 1 day ago
$294
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Jan 17 from Portland to St. Louis, returning Sun, Jan 25, priced at $294 found 1 day ago
United
Wed, Jan 7 - Tue, Jan 20
PWM
Portland
STL
St. Louis
$295 Roundtrip, found 2 days ago
$295
Roundtrip
found 2 days ago
Select United flight, departing Wed, Jan 7 from Portland to St. Louis, returning Tue, Jan 20, priced at $295 found 2 days ago
Southwest Airlines
Thu, Dec 4 - Mon, Dec 8
PWM
Portland
STL
St. Louis
$304 Roundtrip, found 17 hours ago
$304
Roundtrip
found 17 hours ago
Select Southwest Airlines flight, departing Thu, Dec 4 from Portland to St. Louis, returning Mon, Dec 8, priced at $304 found 17 hours ago

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

September is typically the cheapest month to fly

From $209 - $644 per traveler.

Alternative airports near St. Louis

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

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $384
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $384

Frequently asked questions

How much does a flight from Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $117 or cheap return flight from $263 from Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL)?
Traveling in December is a great way to save, as it's the cheapest month for flights between PWM and STL. You'll typically find the lowest prices during off-peak months.
What is the cheapest airline that flies from Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll take you from PWM to STL. Then, sort your results by "Price (lowest to highest)" to score a good deal.
How many flights per day from Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL)?
You'll have to take a flight with a layover if you're traveling from Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from PWM to STL?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Keep in mind that flight schedules can vary based on various factors, including the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL) route, aim to fly before 3 PM. Later departures have a 22% higher chance of cancellation.**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 Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until right before your break to book a flight from PWM to STL often results in higher prices. While you may come across some last-minute discounts, they aren't always guaranteed. Be flexible with your itinerary for a better chance of snagging a bargain.
Is it cheaper to book a PWM to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking a PWM to STL flight and hotel package with Expedia could result in significant savings. Better still, having everything in one place will take the hassle out of travel planning. Simply secure your flights and select from our wide range of hotels, then personalize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Portland Intl. Jetport Airport (PWM) to Lambert-St. Louis Intl. Airport (STL)?
In most instances, you can cancel or reschedule your PWM to STL flight. However, there may be additional charges, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you'd like more information, go to our Customer Service portal.

Travel information

Origin airport
Portland Intl. Jetport
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$262
Distance
1093 mi

Book with confidence

Portland to St. Louis Flights

The cheapest times to fly from Portland to St. Louis

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 Portland to St. Louis are during the month of December. You can find some of the cheapest flights from Portland to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Portland to St. Louis: 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 Portland to St. Louis

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 Portland to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $117 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 Portland to St. Louis 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 Portland to St. Louis 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.

 

Portland to St. Louis Flights

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*Available to One Key members.