$112 Flights from St Louis (STL) to Portland (PDX)

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Flight deals from St Louis to Portland

Looking for a cheap last-minute deal or the best round-trip flight from St Louis to Portland? Find the lowest prices on one-way and round-trip tickets right here.

Find the cheapest month to fly from St Louis to Portland

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Portland flights are currently cheapest in June.

Direct flights from St Louis to Portland

St Louis to Portland: Alternative routes

Compare routes from St Louis to Portland below. You may find an airport to fly into that's cheaper, faster, or easier than Portland.

St Louis to Portland: Flight information

The things to know before you go.
Cheapest flight found$112
Cheapest month to flyJune
Average flight time4 hrs, 8 mins
Most popular airlineAlaska Airlines
Average flights per week9

Finding cheap flights from St Louis to Portland: Frequently asked questions

The best price we found for a round-trip flight from St Louis to Portland is $216. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
4 hours and 8 minutes is the average flight time from St Louis to Portland.
Alaska Airlines and Southwest Airlines fly direct from St Louis to Portland.
There are 9 flights per week flying from St Louis to Portland, as of December 2025.
The cheapest month to fly from St Louis to Portland is usually April.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Portland Airport on Wednesday, April 1, 2026.
Yes – the average flight time is 4 hours and 8 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Portland but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to Portland is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Hawaiian Airlines and Alaska Airlines offer the cheapest flight tickets to Portland.

Traveling from Lambert-St. Louis International Airport (STL) to Portland International Airport (PDX): what you need to know

  • The average duration of a direct flight from Lambert-St. Louis International Airport to Portland International Airport is 4 hours 5 minutes.

  • Portland's timezone is UTC-7, making Portland two hours behind St Louis.

  • Arrive at the airport on time so you don't miss your STL to PDX flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid the stress of rushing.

  • Traveling during a peak time like July? Public holidays and other popular periods can lead to longer lines at security. Be extra cautious and arrive up to four hours ahead of international flights and two hours before a domestic departure.

  • Flying into Portland (and then seeing more of United States!) is a breeze with Southwest Airlines. This popular carrier offers direct flights from Lambert-St. Louis International Airport to Portland International Airport.

  • The majority of travelers choose to fly with Southwest Airlines on this route.

  • Consider adding a stopover when booking your ticket from Lambert-St. Louis International Airport to Portland International Airport. Simply deselect 'Direct flights only' to break up your trip, or perhaps explore a new destination along the way. Check out these options between STL and PDX:

    • Denver International Airport

    • Minneapolis-St. Paul International Airport

    • Seattle-Tacoma International Airport

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Portland International Airport (PDX)

  • The lowest price we've seen for a one-way Lambert-St. Louis International Airport to Portland International Airport flight is $112. A return fare right now is $216. Depending on the availability when you book, these fares can change.

  • To get cheap tickets from STL to PDX, book your trip six months before your departure date.

  • The cheapest month for flights from Lambert-St. Louis International Airport to Portland International Airport is May. Use the 'Whole month' tool to find the lowest airfares if you have flexible dates.

  • You don't need to check back in every day to see if fares have dropped when you set up a Price Alert. We'll let you know the moment there's a better deal on cheap flights from STL to PDX.

  • Tailor your trip with filters. Pick your ideal arrival and departure times, airlines and total journey duration. You can also sort the results by 'Fastest,' 'Cheapest' or 'Best' flights from Lambert-St. Louis International Airport to Portland International Airport.

Handy information about Lambert-St. Louis International Airport (STL)

Arriving at Portland International Airport (PDX)

Getting from Portland International Airport (PDX) to central Portland

  • You'll find PDX at 7000 NE Airport Way.

  • Portland International Airport to the center of Portland has a drive time of around 20 minutes. It's approximately 12 miles away.

  • It'll take around 45 minutes to get there by public transport.

When to fly to Portland International Airport (PDX)

  • The quietest month for a flight from Lambert-St. Louis International Airport to Portland International Airport is May, while July is the most popular. Pick the ideal time to go to Portland based on whether you prefer a faster pace or a more relaxed vibe.

  • When booking your flight from Lambert-St. Louis International Airport to Portland International Airport, consider the kind of weather you enjoy. August is the warmest month in Portland, with the temperature ranging from 54ºF to 88ºF.

  • December has average temperatures of between 32ºF and 48ºF. Look for cheap tickets from STL to PDX around that time if you like traveling in cooler conditions.

Explore more of United States

  • You've visited Portland, now it's time to discover other corners of United States. Journey about 150 miles north to Seattle to check off its leading attractions. From Greyhound: Bus Station to LMN Architects and Boeing Radiation Effects Lab, your itinerary will be busy.

  • Around 290 miles north-east of Portland, Spokane is another favorite stop in United States. Get a taste of what this destination has to offer at Manito Park, Northwest Museum of Arts & Culture and Spokane Falls.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.