$84 Cheap Flights from St. Louis (STL) to Portland (PDX)

View $84 flight on Fri, Oct 3, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Portland International Airport (PDX)

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

Prices were available within the past 7 days and start at $84 for one-way flights and $168 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Oct 30 - Fri, Oct 31
STL
St. Louis
PDX
Portland
$168 Roundtrip, found 3 hours ago
$168
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Thu, Oct 30 from St. Louis to Portland, returning Fri, Oct 31, priced at $168 found 3 hours ago
American Airlines
Tue, Nov 4 - Wed, Nov 5
STL
St. Louis
PDX
Portland
$177 Roundtrip, found 5 days ago
$177
Roundtrip
found 5 days ago
Select American Airlines flight, departing Tue, Nov 4 from St. Louis to Portland, returning Wed, Nov 5, priced at $177 found 5 days ago
Delta
Tue, Nov 4 - Wed, Nov 5
STL
St. Louis
PDX
Portland
$177 Roundtrip, found 5 days ago
$177
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Nov 4 from St. Louis to Portland, returning Wed, Nov 5, priced at $177 found 5 days ago
United
Sat, Nov 8 - Wed, Nov 12
STL
St. Louis
PDX
Portland
$177 Roundtrip, found 6 days ago
$177
Roundtrip
found 6 days ago
Select United flight, departing Sat, Nov 8 from St. Louis to Portland, returning Wed, Nov 12, priced at $177 found 6 days ago
Delta
Tue, Nov 4 - Wed, Nov 5
STL
St. Louis
PDX
Portland
$179 Roundtrip, found 5 days ago
$179
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Nov 4 from St. Louis to Portland, returning Wed, Nov 5, priced at $179 found 5 days ago
American Airlines
Sat, Nov 8 - Wed, Nov 12
STL
St. Louis
PDX
Portland
$182 Roundtrip, found 6 days ago
$182
Roundtrip
found 6 days ago
Select American Airlines flight, departing Sat, Nov 8 from St. Louis to Portland, returning Wed, Nov 12, priced at $182 found 6 days ago
Frontier Airlines
Wed, Oct 29 - Fri, Oct 31
STL
St. Louis
PDX
Portland
$182 Roundtrip, found 3 hours ago
$182
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Wed, Oct 29 from St. Louis to Portland, returning Fri, Oct 31, priced at $182 found 3 hours ago
United
Tue, Nov 11 - Tue, Nov 18
STL
St. Louis
PDX
Portland
$186 Roundtrip, found 5 days ago
$186
Roundtrip
found 5 days ago
Select United flight, departing Tue, Nov 11 from St. Louis to Portland, returning Tue, Nov 18, priced at $186 found 5 days ago
Delta
Sat, Oct 18 - Sat, Oct 25
STL
St. Louis
PDX
Portland
$189 Roundtrip, found 5 days ago
$189
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Oct 18 from St. Louis to Portland, returning Sat, Oct 25, priced at $189 found 5 days ago
Alaska Airlines
Mon, Oct 27 - Tue, Nov 4
STL
St. Louis
PDX
Portland
$248 Roundtrip, found 1 hour ago
$248
Roundtrip
found 1 hour ago
Select Alaska Airlines flight, departing Mon, Oct 27 from St. Louis to Portland, returning Tue, Nov 4, priced at $248 found 1 hour ago

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

October is typically the cheapest month to fly

From $136 - $365 per traveler.

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Airport (PDX) cost?
Snag a cheap one-way flight from $84 or cheap return flight from $168 from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Airport (PDX) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Airport (PDX)?
October is the most affordable month to fly from STL to PDX. Traveling during quieter months is often the key to finding better deals on flights.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Airport (PDX)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll take you from STL to PDX. Then, sort your results by "Price (lowest to highest)" to snap up a good deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Airport (PDX)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Airport (PDX) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filters. Enter your dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to PDX?
Typically you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* However, this can vary based on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What airline has the least delays from STL to PDX?
Southwest Airlines has the best performance for on-time direct flights from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Airport (PDX), with an on-time rating of 80%. Use the Expedia App to look up your flight status before you go and get real-time updates about any trip changes.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Airport (PDX)?
To touch down at Portland Intl. Airport (PDX) without delays, pick a flight that leaves Lambert-St. Louis Intl. Airport (STL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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. Airport (PDX) last-minute?
Last-minute bookings from STL to PDX are typically more expensive. For the lowest prices, start searching for flights well in advance. That said, if you're flexible with your travel dates, you may score a cheap fare right before your trip.
Is it cheaper to book a STL to PDX flight and hotel package?
You can save money by booking a STL to PDX 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 it all in one convenient place. After selecting your preferred accommodations and flights, consider adding extras including 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. Airport (PDX)?
If you booked your STL to PDX flight in the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the ticket type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more details.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Portland Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$168
Distance
1703 mi
Average flight time
3 hours 26 mins

Book with confidence

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 October. 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 $84 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

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.