STL - PDX

$120 Find Cheap Flights from St. Louis to Portland - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Portland departing on 9/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Portland

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Portland.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Portland.
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Everything you should know

Cheapest round-trip
$289
Typical prices: $374-$497
Frontier
Thu 7/16Mon 7/20
STL - PDX • 1 stop
Cheapest non-stop
$337
Alaska Airlines
Tue 8/25Wed 8/26
STL - PDX • Non-stop
Top airlines
Cheapest • from $289 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Alaska Airlines and Southwest. Average duration is 4h 06m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $276 (round-trip)
Shortest trip • 6h 30m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 52% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 20% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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Flight Deals
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Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Portland that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Portland

Thu, Jul 16 - Mon, Jul 20
Frontier Logo
7:10 pm - 4:54 pm
STL
-
PDX
23h 44m
1 stop
Frontier Logo
5:49 pm - 6:05 pm
PDX
-
STL
22h 16m
1 stop
$289Frontier
Tue, Sep 8 - Sun, Sep 13
Multiple Airlines Logo
6:08 pm - 8:20 pm
STL
-
PDX
4h 12mnonstop
Multiple Airlines Logo
9:34 pm - 11:51 am
PDX
-
STL
12h 17m
1 stop
$299Multiple Airlines
Thu, Oct 1 - Mon, Oct 5
Frontier Logo
12:46 pm - 8:39 pm
STL
-
PDX
9h 53m
1 stop
Frontier Logo
9:34 pm - 11:51 am
PDX
-
STL
12h 17m
1 stop
$304Frontier
Sat, Aug 15 - Sun, Aug 16
Southwest Logo
8:30 am - 10:40 am
STL
-
PDX
4h 10mnonstop
Southwest Logo
11:30 pm - 10:30 am
PDX
-
STL
9h 00m
1 stop
$309Southwest
Thu, Jul 23 - Mon, Jul 27
Frontier Logo
7:10 pm - 4:54 pm
STL
-
PDX
23h 44m
1 stop
Frontier Logo
5:49 pm - 6:05 pm
PDX
-
STL
22h 16m
1 stop
$314Frontier
Thu, Jul 30 - Tue, Aug 4
Frontier Logo
7:10 pm - 4:54 pm
STL
-
PDX
23h 44m
1 stop
Frontier Logo
5:16 pm - 7:23 pm
PDX
-
STL
24h 07m
1 stop
$315Frontier
Tue, Aug 11 - Tue, Aug 18
Multiple Airlines Logo
8:08 pm - 4:36 pm
STL
-
PDX
22h 28m
1 stop
Multiple Airlines Logo
10:49 am - 4:37 pm
PDX
-
STL
3h 48mnonstop
$316Multiple Airlines
Fri, Oct 30 - Sat, Nov 7
Delta Logo
1:30 pm - 10:26 pm
STL
-
PDX
10h 56m
1 stop
Delta Logo
9:45 pm - 8:12 am
PDX
-
STL
8h 27m
1 stop
$319Delta
Thu, Sep 24 - Mon, Sep 28
Frontier Logo
12:46 pm - 8:39 pm
STL
-
PDX
9h 53m
1 stop
Frontier Logo
9:34 pm - 9:40 am
PDX
-
STL
34h 06m
2 stops
$322Frontier
Thu, Jul 16 - Sun, Jul 19
Frontier Logo
7:10 pm - 4:54 pm
STL
-
PDX
23h 44m
1 stop
Frontier Logo
6:49 pm - 6:15 pm
PDX
-
STL
21h 26m
1 stop
$323Frontier
Booking Insights

KAYAK's insights & trends for St. Louis to Portland flights

Get data-powered insights and trends into flights from St. Louis to Portland to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from St. Louis to Portland?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Portland departing in July.

What’s the cheapest day of the week to fly from St. Louis to Portland?

The average price of all round-trip flights from St. Louis to Portland clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Portland on a Tuesday and more expensive on a Monday. On your return trip to St. Louis, you should consider flying back on a Friday, and avoid Sundays for better deals.

What is the cheapest month to fly from St. Louis to Portland?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Portland, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Portland is January, where tickets cost $292 (return) on average. On the other hand, the most expensive months are July and November, where the average cost of round-trip tickets is $418 and $413 respectively.

Can I save money by flying with a layover from St. Louis to Portland?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at $317 on average.

How far in advance should I book a flight from St. Louis to Portland?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Portland, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Portland, you should book around 4 weeks before departure, which saves you about 52% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.

Expert advice

Expert advice for your flight from St. Louis to Portland

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on PDX

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Good to know

Low seasonFebruary
Cheapest flight$120
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly with an average 11% increase in price.
Flight from St. Louis to Portland

When to book flights from St. Louis to Portland

Are your dates flexible? Find out the best times to travel from St. Louis to Portland based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Portland

  • What are the transport options from Portland International Airport?

    The easiest way to get downtown is by taking the light rail. PDX is connected to the city by the MAX light rail system, and the Red Line trains depart every 15min. You can also take the shuttle from PDX with several companies offering door-to-door and inter-city shuttle services from PDX. Taxis are also available on the lower roadway around baggage claim, and no reservations are needed. Car rentals are available too, and most companies provide shuttle services from the baggage claim area to the offsite car rental station on the lower roadway.

  • Does Portland International Airport offer accessible services?

    The airport has provided elevators and ramps for passengers in wheelchairs. People with limited mobility also get reserved parking spots, accessible restrooms, fast track services, and dedicated seating areas. Aira services are available for low-vision passengers traveling through PDX. They will also be allowed guide dogs, and braille signage, audio announcements, and tactile guide paths are provided to guide them through PDX. Visual paging is available for the hard of hearing, and TDD telephones are also present at PDX.

  • Which airlines have lounges at Portland International Airport?

    Alaska Airlines, United Airlines, and Delta have lounges at PDX. Delta runs the only members-only lounge at PDX, while the other two options you can access by paying at the door. To access these lounges, you must show your flight ticket and pay a one-time fee. The Delta lounge is on Concourse D airside, Alaska lounge is on Concourse C airside, and United Club is on Concourse E airside. The airport also has a USO lounge for active US military members landside on the mezzanine level.

  • Does Portland International Airport offer family services?

    PDX offers nursing rooms for mothers who are traveling with infants. The nursing rooms provide comfortable seating, fold-down tables, and power outlets. The PDX nursing facilities are airside near the south lobby and around Gate D2. The airport has also provided a children’s play area for passengers with older kids. The PDX play areas are two, and they are both airside around Gates C17 and D7.

  • What is the cheapest flight from St. Louis to Portland?

    In the last 5 days, the lowest price for a flight from St. Louis to Portland was $120 for a one-way ticket and $289 for a round-trip.

  • Do I need a passport to fly between St. Louis and Portland?

    No

  • Which airports will I be using when flying from St. Louis to Portland?

    St. Louis and Portland are both served by 1 main airport. You will leave St. Louis from Lambert-St Louis and will be arriving at Portland.

  • Which airlines offer Wi-Fi service onboard planes from St. Louis to Portland?

    Alaska Airlines, American Airlines, and Delta offer inflight Wi-Fi service on the St. Louis to Portland flight route.

  • Which aircraft models fly most regularly from St. Louis to Portland?

    The Boeing 737 MAX 9 is the aircraft model that flies most regularly on the St. Louis to Portland flight route.

  • Which airline alliances offer flights from St. Louis to Portland?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between St. Louis and Portland, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from St. Louis to Portland?

    There are nonstop flights from St. Louis to Portland on a daily basis.

  • Which is the best airline for flights from St. Louis to Portland, Alaska Airlines or Southwest?

    The two airlines most popular with KAYAK users for flights from St. Louis to Portland are Alaska Airlines and Southwest. With an average price for the route of $397 and an overall rating of 7.9, Alaska Airlines is the most popular choice. Southwest is also a great choice for the route, with an average price of $399 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from St. Louis to Portland?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Portland.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Portland?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Portland from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Portland?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Portland with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and PDX can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Portland?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Portland from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from St. Louis to Portland

  • Looking for a cheap flight? 25% of our users found flights on this route for $188 or less one-way and $462 or less round-trip.
  • St. Louis Lambert International Airport (STL) comprises two terminals and five concourses, A to E. The airport has provided courtesy shuttles for inter-terminal transportation, which run every 5-10min.
  • STL welcomes all pets to the airport. The airport has provided six relief areas: four indoors and two outdoors. The indoor areas are airside, and the outdoor areas are outside Terminal 2 and on the upper west side of Terminal 1.
  • Around 1,084 kg of carbon is emitted on flights from St. Louis to Portland. You can fly more sustainably with Frontier Airlines; they offer a flight emitting 60% less carbon per passenger.
  • Unwind after your flight with a holistic massage or facial at the Dragontree Spa at Portland International Airport (PDX). The spa is open between 9 am and 8 pm and is on Concourse C airside.
  • US Bank has a full-service branch at STL for those in need of banking or currency exchange services. The bank is open weekdays from 8 am to 5 pm and sits on the lower level of Terminal 1.

Prefer to fly direct from St. Louis to Portland?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Lambert-St Louis to Portland.
Find which airlines fly direct from Lambert-St Louis Airport to Portland Airport, which days they fly and book direct flights.

Direct departures

Lambert-St Louis to Portland

Monday

Alaska Airlines

Alaska Airlines

Tuesday

Alaska Airlines

Alaska Airlines

Wednesday

Alaska Airlines

Alaska Airlines

Thursday

Alaska Airlines

Alaska Airlines

Friday

Alaska Airlines

Alaska Airlines

Saturday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Sunday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

See more direct flights

Direct returns

Portland to Lambert-St Louis

Monday

Alaska Airlines

Alaska Airlines

Tuesday

Alaska Airlines

Alaska Airlines

Wednesday

Alaska Airlines

Alaska Airlines

Thursday

Alaska Airlines

Alaska Airlines

Friday

Alaska Airlines

Alaska Airlines

Saturday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

Sunday

Alaska Airlines,Southwest

Alaska Airlines,Southwest

See more direct flights

Reviews of the top 5 airlines serving from St. Louis to Portland

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Portland. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Portland? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
Alaska AirlinesOverall score based on 12589 reviews
7.0Entertainment
7.8Comfort
8.1Boarding
8.5Crew
7.0Food
Airline reviews

We had the bulkhead seats in back of the first class section and there was a rigid plastic barrier which made it very hard to get in and out of our seats. We paid extra for the bulkhead and got neither extra room nor he's getting up. We were very disappointed.

8.0 ExcellentJoan, Jun 2026
BOS - PDX
Read more Alaska Airlines reviews

We had the bulkhead seats in back of the first class section and there was a rigid plastic barrier which made it very hard to get in and out of our seats. We paid extra for the bulkhead and got neither extra room nor he's getting up. We were very disappointed.

Flight was good. The food I preordered was not great. The sandwich bread was a little hard, the cheese was wet on half and dry on the other half. There was a lot of condensation inside the package. Other than that it was great.

Much better than flight from Portland to St Louis, as it was smaller and not confusing.

No screen to see where we were at and no tv.

They lost my bag and 24 hours later have yet to find it

Long delay, no gate agent at deplaning waited 15 mins at the gate. Baggage claim was wrong carousel and over 20 mins after arrival

Flight delayed Didn’t send second leg of trip itemerary First class was fair, but not great.

Nice to get moved from a middle seat to an aisle seat upon request, but why wasn’t I put in an aisle seat to begin with? The flight was not full.

The Crew was super nice but the plane was subpar at best. Filthy in some aspects. Internet only worked half the time and not with everything.

Smooth travel experience. Boarding was efficient. Service on the plane was exceptional. The attendant walked the aisle 3 times in my 3 hour flight to offer drinks and snacks. Flight had no turbulence and I felt safe the entire time. Seats were as comfortable as possible on the plane. Free movies and iMessage texting on the flight was a great surprise.

It was as expected and I was grateful for the wheel chair help and ease of use.

Snacks are always pretzels. Why can't you also offer peanuts ?

Only downside was the legroom and seat width, which is always a problem unless I spend more for a premium seat.

Very good. Sad to learn Southwest is going start to charge for bags

Exceptional crew! Friendly and professional. Pleasant attitude and treated everyone with respect.

The flight was promptly on schedule and Southwest delivered everything they promised. No excuses for any shortfalls just 100% ownership of their responsibilities and business. The boarding and seating policy is a complete shambles. What started out as a great idea when Southwest first hit the market has been turned into a disaster due to the lack of integrity in many of the people who fly Southwest and take advantage of Southwest generosity at the expense of their fellow passengers.

Tight seats. Be prepared to sit in the middle if you are in boarding group C.

Crew was excellent - Plane was fine. Media was good, could use more kid shows; Not a fan of the brownie brittle -- snack could be slightly better.

This was a connecting flight for me and I had already traveled for 7 hours. First, the Pilot didn’t show up and then the gate changed twice, after which the flight was rescheduled for 2 hours later. This made me late and I had to make other transportation arrangements to get home to Astoria another 1 hour & 45 minutes away. This cost me $250 more than it should have. Will not fly southwest again.

Long layover in Chicago. Wish that could have been lessened.

From checking to boarding, it was a seamless experience. The service agents were so helpful. The flight crew was so pleasant.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Delta needs to step its game up get a more reliable internet service. Internet service was non-existent for this flight.

Great flight with Delta! Boarding was quick and easy, the amenities were solid, and the plane was in great shape. The flight attendants had a fun, lively energy while staying professional. All in all, a smooth trip — even managed to catch up on some rest. Thanks, Delta!

My flight was canceled after being rescheduled for four days canceling my trip. Kayak and everyone affiliated with it I.e the airlines, and just fly have been excruciating to deal with. My trip to visit family had to be canceled as there was no way to make it. I am furious at all of you.

They delayed our flight because of bad weather in NY which was completely understandable. Then they cancelled our flight and a later flight that evening. The earliest we could fly was the next morning. We ended up buying last minute tickets on another airline and made it home slightly delayed but safely that evening. Delta kept saying it was weather related but if that was the case how did we make it back on another airline? The weather in NY was cloudy but not bad.

The crew on this leg continue to be extremely helpful with my wife’s mobility issues. They also came by many many times to ensure we were comfortable and had drink some food.

I liked the cleanness in the bathroom and good crew on board and at boarding gates. There was no Hindi (Bollywood) movies. The entertainment can be improved as it is one of the worst one I saw when I compared it with other airlines. The Mumbai to Amsterdam flight did not have any food for my family which does not contain eggs in it though we have selected “Hindu Asian vegetarian meal”

The plane smelled like a sewer. Multiple passengers complained. It’s a safety and quality issue to clean these planes.

Friendly boarding crew. Better could have been a bit more substantial food for this 3 plus hour flight.

Had a one hour delay due to mechanical issue. I didn’t think I’d be able to make my connecting flight, but they waited for me and greeted me when I arrived to help things run smooth.

Staff were good. My seat was in need of repair, but for a short flight was not problematic. Usual basic snack and drink setup that you'll find on any US carrier. Over, a decent, basic flight.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

I will never book a flight through Cheap fare. They booked me from Portland Main . And would not give me a refund, so I bought 2 tickets one for 299. From Portland Main to ORD. Then I had to buy a ticket from Oregon PDX to ORD that was another 440. So Just so you know they even told me it was there fault but no refund. Bad bussniess. I did inform United but they said they couldn't help me due to the fact I booked through Cheap Tickets. Never again. And I'm spreding the word. I let everyone know at my 50th class reunion

Not enough room between rows and food was gross. $160 baggage charge?! Never again.

East Lounge in Denver was terrible. Turning away active military on orders? Really? Sad.

Clean and plenty of room for handbaggage. Leg room was cramped compared with the 777 from Frankfurt.

they made me check my carryon. There was space in the overhead bins.

Cramped and uncomfortable seats. Not enough room for 6’2” person such as myself.

Pretty turbulent, but not anyone’s fault. They got us there. Impressed that they carried on with a drink service.

Everything went as planned. The only issue I had was with the gate C31 attendant. The person could barely speak English and was very difficult to understand.

American Airlines II: Delay Boogaloo. Multiple gate changes, delays, boarded and then MORE delays. I hate to say this won’t matter, but posting stuff about major corporations in 2026 is a post-modern “scream into the void.” Was multiple hours late coming home, so there you go.

It's very confusing because Kayak has it as American Airlines, but it was Hawaiian Airlines, but operated by Alaska Airlines. I had to go to the airport for my boarding pass because American said I didn't have any trips.

Seats were much more cramped then on the 737. Narrower and rows closer together. Flight was absolutely packed and the plugs under the seats didn't work. Was forced to check my bag even though previous flight had no issue with it.

The plane was late, when we did board the plane was as cold as a freezer. I was freezing the entire flight, no blankets. Lost miserable flight I’ve ever had.

Because of rescheduling, they had to put me on a flight that didn't go through Dallas

Packed commercial flight was as comfortable as can be expected

We were re routed due to a flight cancellation. We did not fly out of Miami. We originally booked first class and were moved to coach without being compensated.

2 gate changes, several announced delays, not enough room and seats at the gate. Many had to stand while waiting. The actual flight was fine.

American Airlines customer service was extremely poor. They canceled our flights multiple times. Then put us on standby trying to get on flights instead of booking us on a confirmed flight to get us home. So flight after flight we kept our hopes up just to be disappointed and stuck from a connecting flight. We had never been to Dallas so we were sleeping on the floor at the airport waiting to get home.

Everything you need to know for your flight from St. Louis to Portland

Information on your arrival and departure airports