STL - PDX

$95 Find Cheap Flights from St. Louis to Portland

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 4/2. 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
$180
Overall average: $289
Frontier
Thu 1/29Thu 2/5
STL - PDX • 1 stop
Cheapest non-stop
$210
Alaska Airlines
Wed 5/13Sun 5/17
STL - PDX • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
Avoid peak hours at STL for shorter security lines.
Use the Trimet Red Line for a budget ride from PDX.
Expert advice
Expert advice
Expert advice
Expert advice
Video guide: How to find cheap flights to Portland
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Top airlines
Alaska Airlines
Cheapest • from $204 (round-trip)
Alaska Airlines
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 32% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 19% price drop
June
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, Jan 29 - Thu, Feb 5
Frontier Logo
10:01 pm - 9:49 am
STL
-
PDX
13h 48m1 stop
Frontier Logo
11:28 am - 9:06 pm
PDX
-
STL
7h 38m1 stop
$180Frontier
Tue, Feb 3 - Tue, Feb 10
Delta Logo
6:40 am - 12:32 pm
STL
-
PDX
7h 52m1 stop
Delta Logo
1:53 pm - 11:25 pm
PDX
-
STL
7h 32m1 stop
$189Delta
Wed, Feb 18 - Wed, Feb 25
Southwest Logo
2:15 pm - 10:35 pm
STL
-
PDX
10h 20m1 stop
Southwest Logo
6:00 am - 5:10 pm
PDX
-
STL
9h 10m2 stops
$194Southwest
Thu, Jan 29 - Thu, Feb 5
Frontier Logo
10:01 pm - 9:49 am
STL
-
PDX
13h 48m1 stop
Frontier Logo
11:28 am - 9:06 pm
PDX
-
STL
7h 38m1 stop
$201Frontier
Mon, Jan 26 - Mon, Feb 2
Alaska Airlines Logo
2:50 pm - 8:47 pm
STL
-
PDX
7h 57m1 stop
Alaska Airlines Logo
2:38 pm - 1:54 pm
PDX
-
STL
21h 16m1 stop
$204Alaska Airlines
Thu, Feb 5 - Mon, Feb 9
Multiple Airlines Logo
10:01 pm - 9:49 am
STL
-
PDX
13h 48m1 stop
Multiple Airlines Logo
1:38 pm - 1:54 pm
PDX
-
STL
22h 16m1 stop
$216Multiple Airlines
Wed, Mar 25 - Tue, Mar 31
American Airlines Logo
6:00 am - 10:48 am
STL
-
PDX
6h 48m1 stop
American Airlines Logo
10:35 pm - 8:35 am
PDX
-
STL
8h 00m1 stop
$218American Airlines
Fri, Feb 6 - Tue, Feb 10
Delta Logo
3:31 pm - 8:32 pm
STL
-
PDX
7h 01m1 stop
Delta Logo
5:50 am - 1:48 pm
PDX
-
STL
5h 58m1 stop
$219Delta
Mon, Jan 26 - Mon, Feb 2
United Airlines Logo
6:00 am - 12:18 pm
STL
-
PDX
8h 18m1 stop
United Airlines Logo
12:59 pm - 10:00 pm
PDX
-
STL
7h 01m1 stop
$229United Airlines
Fri, Jan 30 - Sun, Feb 1
Alaska Airlines Logo
2:50 pm - 8:47 pm
STL
-
PDX
7h 57m1 stop
Alaska Airlines Logo
9:30 pm - 1:54 pm
PDX
-
STL
14h 24m1 stop
$230Alaska Airlines
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.

Find cheap flights to Portland
Find cheap flights to Portland

Planning a trip from St. Louis to Portland? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

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 Friday and more expensive on a Sunday. On your return trip to St. Louis, you should consider flying back on a Saturday, 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 $289 (return) on average. On the other hand, the most expensive months are March and November, where the average cost of round-trip tickets is $472 and $402 respectively.

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 32% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 8 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.
Airports
STL

Avoid peak hours at STL to skip crowded terminals and long security lines. Early mornings and afternoons are busiest.

PDX

Use the Trimet Red Line light rail for a quick, budget-friendly ride from PDX to downtown Portland.

Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on PDX

Gabriel Leigh

Gabriel Leigh

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.

Read more
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia Denisyuk

Yulia Denisyuk

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.

Read more

Good to know

Low seasonFebruary
Cheapest flight$86
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly with an average 5% 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 3 days, the lowest price for a flight from St. Louis to Portland was $95 for a one-way ticket and $177 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?

    Only Alaska Airlines offers 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 8 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, oneworld, and SkyTeam are the airline alliances operating flights between St. Louis and Portland, with Star Alliance being the most commonly used for this route.

  • What is the most popular layover when flying to Portland from St. Louis?

    Denver is the most popular layover city among KAYAK users traveling from St. Louis to Portland.

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

    The two airlines most popular with KAYAK users for flights from St. Louis to Portland are Southwest and Alaska Airlines. With an average price for the route of $395 and an overall rating of 8.0, Southwest is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $388 and an overall rating of 8.0.

  • 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 $134 or less one-way and $299 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.

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.
8.0
Alaska AirlinesOverall score based on 11648 reviews
8.1Boarding
7.8Comfort
8.5Crew
7.0Entertainment
7.1Food
Airline reviews

Alaska is a great airline. Unfortunately, our flight was canceled in a really late hour and it caused a lot of hardship in my travel process.

2.0 MediocreAnonymous, Jan 2026
LAX - PDX
Read more Alaska Airlines reviews

Alaska is a great airline. Unfortunately, our flight was canceled in a really late hour and it caused a lot of hardship in my travel process.

More comfortable than the flight to Los Angeles. But food was mediocre again. Attendants kind and courteous.

Alaska Airlines has the best service of airlines I have flown the last couple years. I always choose them first.

I haven’t flown in over 20 years and had my grandkids, so I had lots of questions. They were very polite and helpful . Thank you.

I know there were a lot of delayed flights, mine from Portland to Eugene was delayed by 3 hours, but not from one employee was there a" we are so sorry about the delay or is there anything we could get you, I thought it was very un-professional and rude.

The delays were awful and the constant gate changes were annoying and the forceful bag checking was rude.

Food was bad. Just a drink for a 5 hour flight

I liked that the crew was friendly, we left and arrived at near scheduled times, plenty of on-board crew to handle the cabin service for the flight and I found the price of my airline ticket to be excellent!

No accommodation or credit offered for cancelled layover flight to Eugene from portland

If they actually let me fly. I was rerouted to United and there was no Alaska airlines reps at all. Then the lady who worked the delta counter told me to go away and figure things out myself. Horrible experience.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

Pretty seamless, just a tad bit late in taking off and landing.

Flight was fine other than there was a gate change that I was not notified of. By chance I happened to check my phone and saw the change, otherwise, we would have missed our connecting flight.

Haven’t flown on SW in years. Flight was on time departing and arriving. Served vegan butter onion flavored pretzels which were bad. Coke served was in a tiny paper cup. Crew was not engaging. Felt like they were going through the motions. Old plane, tight seats and no leg room.

Check-in, Boarding and flight were smooth. All the employees and crew was very nice and funny. They gave the kids crayons and workbooks to keep them occupied which was a big win. I’ve flown Southwest many times and that’s the first time I’ve seen that and it is a great addition.

Flight was on time. Wi-fi was a little spotty/slow. Boarding and exit were efficient.

Okay, not wonderful. Short flight. Wi-fi didn't work properly. Stuck waiting for a gate to open upon arrival for 20 or so minutes.

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Flight was late from Newark to Atlanta, I asked flight attendant to please let my family of 3 out first when we landed to Atlanta because we were late for our connecting flight to Quito. She didn't and we were late for 5 minutes we couldn't board the plane and spend hours trying to get another flight with customer service for the next day.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Late delayed flight delays boarding and delays leaving and delays on arrival too. Cramped plane no room no food.

DTW line is too long. The flights from DTW to BWI are always delayed for unknown reasons.

Delta canceled our flight and we had to scramble to find another airline to get home. Phoenix is not a delta hub so they didn’t have another plane. It would have been a red eye though Salt Lake City. Getting in at 5am. No bueno.

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

This flight was a first class choice and left much to be desired. Seat backs on seats were falling apart and torn. Seats actually didn't come to a "full & upright position". Pull out table was sprung. Not any significant leg room. All in all we were on an obviously older plane and felt overcharged for what we received as first class.

Flight was delayed several times. At one point, they "pulled back" 15 minutes from the delayed boarding and sent a text saying we would board sooner than previously advised. The flight then was delayed again. And when we boarded, there was an unspecified technical issue which had us waiting in the plane for about an hour.

Delta is a good airline. I've never had an issue with Delta. I'll continue to fly with them until they show me that I shouldn't.

The only thing nice I can say is the flight crew was really nice and apologetic about the situation. They shared as much information as they had and advised us on what we could do about missing connecting flights. The boarding process was so slow. The gate agent was working by herself and should have had someone working with her. It took almost an hour to board because she was trying to board a full flight of people and provide customer service to everyone who was flying standby and/or had questions. It was really chaotic. This didn't help the fact that we were delayed and folks were missing connections the longer it took.

They lost my luggage, so, not happy. The crew was nice but my suitcases never made it, still trying to find out what happened!

The staff was hospitable and professional. The seat had a bit of wear. The winner shade was stuck 1/4 open. I received the best of both worlds. The morning sun was able to come in and blind the screen i was trying to use while at the same time it was too low to look out and enjoy the view. Rather embarrassing for a 1st class ticket.

Perfect flight. Smooth flight. Arrived 20 minutes early at destination. Excellent service.

The flights were on time which was great give. It was holiday travel season and there’d been some weather issues. The only complaint and this is every time with United is the terrible seat design. The head rest is not built for comfort and having my neck bent forward for a cross country trip reminded me while I try not to take United flights as a rule.

I’m so sorry, I can’t remember her name, I believe it was Dimpti. She was stellar, also a mature Asian flight attendant, lots of flowers in her hair, just as amazing! But literally the crew was AWESOME . Only downside is there weren’t any charging outlets. Maybe I needed to ask a flight attendant , but it would’ve been nice to have one easily accessible.

The flight was delayed by two de-icings. The seatbelt did not work correctly. It did not stay tight.

Everything was absolutely wonderful from check in to baggage claim. Staff was very professional and sweet. Will definitely recommend United to family and friends.

Sitting on the runway after we land for almost two hours! Not sure if we should blame United or Just Dumpy Vance.

Hotter than Hades in August. Why, why do crews think that in the winter when we are already dressed for cold weather we need a cabin that is 82 degrees. Even the vents were blowing hot air.

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

Everything about the flight was lovely. My only suggestion would be to offer a few more options of tv series from Apple TV or HBO.

Nothing to write home about, average flight experience. Seats were spacious enough, crew friendly enough. Loved the AA entertainment/wifi service.

Kayak was among the missing. There was not the usual advice regarding next gate after arriving in Dallas. No communication after the reminder to check in before the Moline flight. What happened?

They should have allowed for extra time to de-ice the plane before boarding passengers. This delayed us about 10-15 mins after we boarded. Overall experience was fine. Crew was friendly and on top of everything. We didn’t have any issues during the flight.

Experience was good. We were delayed in leaving by 15 mins because the flight was waiting on a family that was late in getting to the gate. Food and drink options were as expected. I highly recommend checking in ahead of time using the airline’s app so that it’s quicker to get your luggage tags as soon as you arrive at the terminal. No more waiting in long lines!

Overall experience was great. Flights were almost on time in departing and we arrived at our destination as scheduled. No issues with amenities or flight crew. Everything went well as as expected. Will fly again with American Airlines in the future!

We never made it due to delays on both ends. Gate attendant said it was mechanical but the system said otherwise, so no compensation. That’s not right.

Our flight from Eagle to Vail was delayed to the point we missed our connection to Savannah. Now we’re a family of 4 in a hotel room with luggage, no toiletries, no clean clothes. Gate attendant said the delay was mechanical but it was put in the system as something else so no compensation. That’s just wrong.

Crew were all friendly and helpful. It was a short flight so just a beverage service with a cookie. After we were boarded the plane took about 45 minutes to leave the gate but it was New Year’s Eve so not shocking there was some delay. Overall good experience and very grateful.

After the door had been closed, the cockpit makes an announcement that catering is running late and it is not the airline's fault. It is their fault in the sense that we had to sit for 2 hours or more when we could have stayed in the terminal. Poor communications between catering and airline. This caused a young man to lose his temper and he went storming out hitting objects. He had complained to the gate agent that he had already waited at the gate 7 hours and when can the airplane leave? Airilnes do a poor job of explaining delays, maintenance issues, etc. whereas being truthful may gain more sympathy or understanding.

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

Information on your arrival and departure airports