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175 € Cheap Flights from Portland to St Louis

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      Travellers and cabin class, 1 Adult, Economy

      Compare Portland to St Louis flight deals

      Find the cheapest month or even day of the year to fly to St Louis

      Book the best St Louis fare with no extra fees

      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 175 €. Find the lowest prices on one-way and return tickets right here.
      St Louis.175 € per passenger.Departing Sat, 22 Aug, returning Sat, 29 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Sat, 22 Aug, arriving in St Louis.Inbound indirect flight with Southwest Airlines, departs from St Louis on Sat, 29 Aug, arriving in Portland.Price includes taxes and charges.From 175 €, select.
      St Louis.180 € per passenger.Departing Mon, 19 Oct, returning Mon, 26 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Mon, 19 Oct, arriving in St Louis.Inbound indirect flight with Southwest Airlines, departs from St Louis on Mon, 26 Oct, arriving in Portland.Price includes taxes and charges.From 180 €, select.
      St Louis.184 € per passenger.Departing Tue, 1 Sep, returning Wed, 23 Sep.Return flight with Delta.Outbound indirect flight with Delta, departs from Portland on Tue, 1 Sep, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Wed, 23 Sep, arriving in Portland.Price includes taxes and charges.From 184 €, select.
      St Louis.185 € per passenger.Departing Mon, 31 Aug, returning Wed, 2 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Portland on Mon, 31 Aug, arriving in St Louis.Inbound indirect flight with Southwest Airlines, departs from St Louis on Wed, 2 Sep, arriving in Portland.Price includes taxes and charges.From 185 €, select.
      St Louis.208 € per passenger.Departing Fri, 6 Nov, returning Wed, 11 Nov.Return flight with Delta.Outbound indirect flight with Delta, departs from Portland on Fri, 6 Nov, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Wed, 11 Nov, arriving in Portland.Price includes taxes and charges.From 208 €, select.
      St Louis.229 € per passenger.Departing Wed, 2 Dec, returning Wed, 9 Dec.Return flight with United.Outbound indirect flight with United, departs from Portland on Wed, 2 Dec, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Wed, 9 Dec, arriving in Portland.Price includes taxes and charges.From 229 €, select.
      St Louis.257 € per passenger.Departing Tue, 28 Jul, returning Tue, 4 Aug.Return flight with Delta.Outbound indirect flight with Delta, departs from Portland on Tue, 28 Jul, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Tue, 4 Aug, arriving in Portland.Price includes taxes and charges.From 257 €, select.
      St Louis.277 € per passenger.Departing Wed, 25 Nov, returning Wed, 2 Dec.Return flight with United.Outbound indirect flight with United, departs from Portland on Wed, 25 Nov, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Wed, 2 Dec, arriving in Portland.Price includes taxes and charges.From 277 €, select.
      St Louis.279 € per passenger.Departing Thu, 23 Jul, returning Sun, 26 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Portland on Thu, 23 Jul, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 26 Jul, arriving in Portland.Price includes taxes and charges.From 279 €, select.
      St Louis.304 € per passenger.Departing Thu, 31 Dec, returning Thu, 14 Jan.Return flight with United.Outbound indirect flight with United, departs from Portland on Thu, 31 Dec, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Thu, 14 Jan, arriving in Portland.Price includes taxes and charges.From 304 €, select.
      St Louis.386 € per passenger.Departing Fri, 1 Jan, returning Fri, 15 Jan.Return flight with United.Outbound indirect flight with United, departs from Portland on Fri, 1 Jan, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Fri, 15 Jan, arriving in Portland.Price includes taxes and charges.From 386 €, select.
      St Louis.585 € per passenger.Departing Sat, 11 Jul, returning Sun, 12 Jul.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Portland on Sat, 11 Jul, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sun, 12 Jul, arriving in Portland.Price includes taxes and charges.From 585 €, 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.
      Jul
      from 279 €
      Aug
      from 175 €
      Sep
      from 184 €
      Oct
      from 180 €
      Nov
      from 208 €
      Dec
      from 229 €
      Jan
      from 386 €
      Feb
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      Mar
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      Apr
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      May
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      Jun
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      Direct flights 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 175 €
      Search flights

      Belleville

      32km from central St Louis
      Search flights

      Portland to St Louis: Flight information

      The things to know before you go.
      Cheapest flight found175 €
      Cheapest month to flyAugust
      Average flight time3 hrs, 48 mins
      Most popular airlineAlaska Airlines
      Average flights per week5

      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 175 €. 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 48 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 July 2026, there are 5 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 Saturday, 22 August 2026.
      Yes – the average flight time is 3 hours and 48 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, Southwest Airlines offers the cheapest flight tickets to St Louis.

      Travelling from Portland Airport (PDX) to St Louis Airport (STL): what you need to know

      • The average duration of a direct flight from Portland Airport to St Louis Airport is 3 hours 50 minutes.

      • St Louis's timezone is UTC-6, making St Louis two hours ahead of Portland.

      • There are three Portland Airport to St Louis Airport flights every week to choose from.

      • For a stress-free journey, arrive at the airport two hours ahead of international flights and one hour before domestic departures. This will give you enough time to board your PDX to STL flight.

      • You'll likely experience longer lines during popular months like July. Arriving up to four hours ahead of an international flight and two hours for a domestic departure will give you ample time for security and boarding.

      • Alaska Airlines offers direct flights from Portland Airport to St Louis Airport. Book with this popular airline, then get ready to check out the sights in St Louis — and maybe even more of the United States if your schedule allows.

      • The airline with the highest number of bookings on this route is Alaska Airlines.

      • If you want to include a stop along the way, simply uncheck 'Direct flights only' when searching for your ticket from Portland Airport to St Louis Airport. These are the most popular stopovers between PDX and STL:

        • Denver International Airport

        • Minneapolis St Paul Airport

        • Salt Lake City Airport

      How to find the cheapest flights from Portland Airport (PDX) to St Louis Airport (STL)

      • 92 € is the best price for a one-way Portland Airport to St Louis Airport flight. A return flight starts at 175 €. These prices can change depending on demand.

      • Don't wait until the last minute. You're more likely to get cheap tickets from PDX to STL if you book ahead. Airlines often offer some amazing early bird discounts.

      • Getting cheap flights from Portland Airport to St Louis Airport is easy if you can be flexible with your travel plans. Use the 'Whole month' search function to see the lowest fares across each month and bag a great deal.

      • Save time looking for cheap flights from PDX to STL by creating a Price Alert. You'll get an email or push notification on the app when a lower fare becomes available.

      • Find the perfect flight for you by using the filters. To see the 'Fastest,' 'Best' or 'Cheapest' flights from Portland Airport to St Louis Airport, use the 'Sort by' tool. You can also filter by departure and arrival times, airline, and journey duration.

      Handy information about Portland Airport (PDX)

      • PDX is located at 7000 NE Airport Way.

      • Portland Airport gets top marks for its on-time performance. 83% of flights that depart PDX land on time.

      • Central Portland to Portland Airport is approximately 19 kilometres. Depending on traffic, it'll take you about 20 minutes to get there if you're driving, ride-sharing or catching a taxi.

      • The journey when using public transport usually takes 40 minutes.

      • Get your holiday off to a hassle-free start by staying near PDX. Whether you're boarding an early flight from Portland Airport to St Louis Airport or want to avoid feeling rushed, these stays have you covered:

      Arriving at St Louis Airport (STL)

      Getting from St Louis Airport (STL) to central St Louis

      • You'll find STL at 10701 Lambert International Blvd..

      • St Louis Airport to the centre of St Louis has a drive time of around 25 minutes. It's approximately 24 kilometres away.

      • If you're travelling on public transport, expect a journey time of about 30 minutes.

      When to fly to St Louis Airport (STL)

      • The quietest month for a flight from Portland Airport to St Louis Airport is March, while July is the most popular. Choose the ideal time to visit St Louis based on whether you prefer a faster pace or a more relaxed vibe.

      • The warmest month in St Louis is July, with the temperature ranging between 17ºC (63ºF) and 33ºC (91ºF). Lock in your flights from Portland Airport to St Louis Airport in this month if you like this kind of weather.

      • January has average temperatures of between -7ºC (19ºF) and 8ºC (46ºF). Search for cheap tickets from PDX to STL around that time if you want to travel when it's cooler.

      Explore more of the United States

      • Chicago is just one of the many cities in the United States waiting to be discovered once you've seen St Louis. Around 418 kilometres away to the north-east, its top attractions include Millennium Park, Art Institute of Chicago and Willis Tower.

      • If you want to check out another major stop in the United States, head for Indianapolis, about 370 kilometres east of St Louis. Lucas Oil Stadium, Eiteljorg Museum and The Children's Museum of Indianapolis are key highlights.

      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 12 days.