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C$169 Cheap Flights from Portland (PDX) to St Louis (STL)

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Flight deals from Portland to St Louis

Looking for a cheap last-minute deal or the best return flight from Portland Airport to St Louis Airport? If you want to travel next month, return fares start from C$339. Find the lowest prices on one-way and return tickets right here.
St Louis.C$169 per passenger.Departing Mon., Aug. 17.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Portland on Mon., Aug. 17, arriving in St Louis.Price includes taxes and charges.From C$169, select.
St Louis.C$170 per passenger.Departing Mon., Jun. 8.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Portland on Mon., Jun. 8, arriving in St Louis.Price includes taxes and charges.From C$170, select.
St Louis.C$177 per passenger.Departing Sun., Jul. 26.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Portland on Sun., Jul. 26, arriving in St Louis.Price includes taxes and charges.From C$177, select.
St Louis.C$177 per passenger.Departing Fri., Sep. 11.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Portland on Fri., Sep. 11, arriving in St Louis.Price includes taxes and charges.From C$177, select.
St Louis.C$208 per passenger.Departing Mon., Sep. 21.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Portland on Mon., Sep. 21, arriving in St Louis.Price includes taxes and charges.From C$208, select.
St Louis.C$214 per passenger.Departing Sat., Jul. 25.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Portland on Sat., Jul. 25, arriving in St Louis.Price includes taxes and charges.From C$214, select.
St Louis.C$214 per passenger.Departing Fri., Jun. 5.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Portland on Fri., Jun. 5, arriving in St Louis.Price includes taxes and charges.From C$214, select.
St Louis.C$216 per passenger.Departing Fri., Oct. 2.One-way flight with Delta.Outbound indirect flight with Delta, departs from Portland on Fri., Oct. 2, arriving in St Louis.Price includes taxes and charges.From C$216, select.
St Louis.C$235 per passenger.Departing Wed., Aug. 12.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Portland on Wed., Aug. 12, arriving in St Louis.Price includes taxes and charges.From C$235, select.

Find the cheapest month to fly from Portland to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Portland to St Louis flights are currently cheapest in August.
May
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Jun.
from C$170
Jul.
from C$177
Aug.
from C$169
Sep.
from C$177
Oct.
from C$216
Nov.
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Dec.
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Jan.
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Apr.
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Which airlines fly from Portland to St Louis?

Portland to St Louis: Alternative routes

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

St Louis

20km from central St Louis
ClosestCheapest
from C$169
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Belleville

32km from central St Louis
from C$410
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Sparta Community

69km from central St Louis
Search flights

Portland to St Louis: Flight information

The things to know before you go.
Cheapest flight foundC$169
Cheapest month to flyAugust
Average flight time3 hrs, 47 mins
Most popular airlineAlaska Airlines
Average flights per week11

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

The best price we found for a return flight from Portland to St Louis is C$339. 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.
3 hours and 47 minutes is the average flight time from Portland to St Louis.
Alaska Airlines and Southwest Airlines fly direct from Portland to St Louis.
As of May 2026, there are 11 flights per week flying from Portland to St Louis.
The cheapest month to fly from Portland to St Louis is usually August.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Portland Airport to St Louis Airport on Sunday, August 16, 2026.
Yes – the average flight time is 3 hours and 47 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 St Louis 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 St Louis is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines and Alaska Airlines offer the cheapest flight tickets to St Louis.

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

  • 3 hours 44 minutes is the average time for a direct flight from Portland International Airport to Lambert-St. Louis International Airport. St Louis is 2 hours ahead of Portland and operates on the UTC-5 timezone.

  • If you're getting away during a peak month like July, get to the terminal even earlier. It's wise to arrive up to four hours before international flights and two hours ahead of domestic departures. You can expect lines to be longer during high seasons like summer and spring break.

  • If you'd like to have a stopover for your flight from Portland International Airport to Lambert-St. Louis International Airport, just uncheck 'Direct flights only' and check out your options. Here are the top stopovers between PDX and STL:

    • Minneapolis-St. Paul International Airport

    • Salt Lake City International Airport

    • Denver International Airport

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

  • The best price we've found for a one-way ticket from Portland International Airport to Lambert-St. Louis International Airport is C$169. The cheapest price for a return flight is C$339. Keep in mind that fares could change due to availability when booking.

  • To get cheap flight tickets from PDX to STL, book your journey 9 months before your departure date.

  • Organize your trip for May. That's the cheapest month for flight tickets from Portland International Airport to Lambert-St. Louis International Airport. If your travel dates are flexible, try out the 'Whole month' tool to see the cheapest airfare across each month.

  • Log into your online account or use the app to create a Price Alert. We'll let you know right away if there's a better deal on this route. It's simple to do, and it'll save you time checking for cheap flight tickets from PDX to STL every day.

  • Use filters to find the perfect journey for you. To see the 'Best,' 'Cheapest' or 'Fastest' flights from Portland International Airport to Lambert-St. Louis International Airport, use the 'Sort by' function. You can also filter results by arrival and departure times, airline, and journey duration.

Handy information about Portland International Airport (PDX)

Arriving at Lambert-St. Louis International Airport (STL)

Getting from Lambert-St. Louis International Airport (STL) to central St Louis

  • Lambert-St. Louis International Airport to the center of St Louis is around 21 minutes by car. It's approximately 26 kilometres away. Find out what options are available, such as cabs, car rentals or ride-sharing.

  • It typically takes 36 minutes if you're using public transport.

When to fly to Lambert-St. Louis International Airport (STL)

  • The quietest month for a flight from Portland International Airport to Lambert-St. Louis International Airport is April, while July is the busiest. Choose the best time to go to St Louis based on whether you prefer a laid-back vibe or a more bustling atmosphere.

  • Lock in your flight from Portland International Airport to Lambert-St. Louis International Airport for July if you want to visit St Louis during its warmest month. Expect temperatures of between 17ºC and 33ºC.

  • January sees average temperatures of between -8ºC and 7ºC. Look for cheap flight tickets from PDX to STL sometime around then if you'd rather travel in cooler conditions.

More about St Louis

  • As soon as you've booked your flights from PDX to STL, you'll need to find a hotel in St Louis. Make one of these accommodation options your base for exploring this city:

  • There are so many things to see and do in this city it can be tricky to work out where to begin. The Gateway Arch, Forest Park and St. Louis Zoo are popular attractions which should be on every St Louis itinerary.

Complete your St Louis trip with hotels and a car rental

  • Once you've secured your cheap ticket to Lambert-St. Louis International Airport, discover the lowest prices and exclusive rates for hotels. You can also compare hundreds of car rental companies in one go to get the best car rental price for your St Louis getaway.

Plan the rest of your trip from Portland to St Louis

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