Cheap flights from St. Louis to Portland (STL to PDX)

Frequently asked questions

Is it cheaper to buy a plane ticket from Lambert Field to PDX last minute?

Being a spontaneous soul is an amazing way to see the world, but it isn’t always the best way to track down a bargain flight. Consider booking your Lambert-St. Louis Intl. Airport (STL) to Portland Intl. Airport (PDX) trip ahead of time instead of waiting till the last minute. Based on flight pricing and demand studies in 2022, we have found that the best time to book domestic flights is between 28 – 35 days ahead of the departure date, and international flights three to four months in advance. You can unleash your spontaneous side when you get to Portland Intl. Airport (PDX)!

What airports do you fly into for Portland from St. Louis?

With Portland Intl. Airport (PDX), Salem, OR (SLE-McNary Field) and Portland - Troutdale Airport (TTD) to select from, making your way from St. Louis to Portland is a cinch. The city’s major gateway, Portland Intl. Airport (PDX), is approximately 7 mi northeast of the center. Besides ticket prices, consider things like train or bus options from the airport and the distance to your hotel when deciding where to touch down. Get your Portland vacation off on the right foot by checking out Oregon Zoo and Portland State University.

Can I change the date of my flight from Lambert Field to PDX Airport?

You can quickly make changes to your Lambert-St. Louis Intl. Airport (STL) to PDX Airport trip via the Expedia Trips portal. But before doing so, read over the conditions and rules in your itinerary to find out what the airline will let you do and whether fees apply. Some carriers have a change fee per person, on top of any difference in ticket prices. But if you booked in the last 24 hours, you may be able to cancel for free and organize new flights. You can also visit our Customer Service portal for further information and to connect with our Virtual Agent.

Travel information

Origin airport	Lambert-St. Louis Intl.
Destination airport	Portland Intl.
Distance	1703 mi

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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 . 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 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.

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

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