PDX - STL

$72 Find Cheap Flights from Portland to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Portland to St. Louis departing on 3/8. 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 St. Louis

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

Cheapest round-trip
$191
Overall average: $339
Frontier
Sat 4/18Sat 4/25
PDX - STL • 1 stop
Cheapest non-stop
$249
Alaska Airlines
Thu 5/21Wed 5/27
PDX - STL • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
PDX offers easy navigation with a single main terminal.
Use MetroLink for easy access to downtown St. Louis.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Frontier
Cheapest • from $191 (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 29% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
November
Cheapest • 18% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portland to St. Louis 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 Portland to St. Louis

Sat, Apr 18 - Sat, Apr 25
Frontier Logo
12:27 pm - 7:12 pm
PDX
-
STL
28h 45m
1 stop
Frontier Logo
4:16 pm - 8:59 am
STL
-
PDX
18h 43m
1 stop
$191Frontier
Sun, Feb 22 - Sun, Mar 1
Multiple Airlines Logo
6:58 pm - 8:02 pm
PDX
-
STL
23h 04m
1 stop
Multiple Airlines Logo
10:11 pm - 9:23 pm
STL
-
PDX
25h 12m
2 stops
$235Multiple Airlines
Sun, Feb 22 - Sun, Mar 1
Multiple Airlines Logo
6:58 pm - 8:02 pm
PDX
-
STL
23h 04m
1 stop
Multiple Airlines Logo
10:11 pm - 6:21 pm
STL
-
PDX
22h 10m
1 stop
$245Multiple Airlines
Wed, Mar 4 - Tue, Mar 31
United Airlines Logo
1:18 pm - 11:21 pm
PDX
-
STL
8h 03m
1 stop
United Airlines Logo
8:30 am - 2:30 pm
STL
-
PDX
8h 00m
1 stop
$249United Airlines
Thu, Apr 16 - Sat, Apr 18
American Airlines Logo
11:40 pm - 8:57 am
PDX
-
STL
7h 17m
1 stop
American Airlines Logo
5:20 am - 11:01 am
STL
-
PDX
7h 41m
1 stop
$273American Airlines
Tue, Mar 3 - Tue, Mar 31
American Airlines Logo
6:40 am - 3:28 pm
PDX
-
STL
6h 48m
1 stop
American Airlines Logo
6:00 am - 10:48 am
STL
-
PDX
6h 48m
1 stop
$278American Airlines
Wed, Apr 1 - Mon, Apr 6
Delta Logo
1:55 pm - 12:21 am
PDX
-
STL
8h 26m
2 stops
Delta Logo
6:12 pm - 11:54 pm
STL
-
PDX
7h 42m
1 stop
$281Delta
Fri, Apr 24 - Sun, Apr 26
Multiple Airlines Logo
1:52 pm - 11:59 pm
PDX
-
STL
8h 07m
1 stop
Multiple Airlines Logo
8:12 pm - 11:03 am
STL
-
PDX
16h 51m
1 stop
$284Multiple Airlines
Fri, Mar 6 - Sun, Mar 8
Frontier Logo
12:04 pm - 9:49 am
PDX
-
STL
19h 45m
1 stop
Frontier Logo
7:52 am - 9:13 am
STL
-
PDX
27h 21m
2 stops
$286Frontier
Sat, Feb 14 - Tue, Feb 17
American Airlines Logo
11:35 pm - 10:03 am
PDX
-
STL
8h 28m
1 stop
American Airlines Logo
6:31 pm - 12:17 am
STL
-
PDX
7h 46m
1 stop
$293American Airlines
Booking Insights

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

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

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

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

If you are looking for a flight deal from Portland to St. Louis, look for departures on Saturdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from St. Louis, Friday is the cheapest day to fly and Sunday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Portland to St. Louis, 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 Portland to St. Louis is November, where tickets cost $300 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is $472 and $413 respectively.

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

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 1 stop layover the cheapest option at $329 on average.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Portland to St. Louis, 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 Portland to St. Louis, you should book around 4 weeks before departure, which saves you about 29% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 18 weeks before departure.

Expert advice

Expert advice for your flight from Portland to St. Louis

 
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 seasonJanuary
Cheapest flight$72
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 12% increase in price.
Flight from Portland to St. Louis

When to book flights from Portland to St. Louis

Are your dates flexible? Find out the best times to travel from Portland to St. Louis 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 Portland to St. Louis

  • Does the Portland Airport have any designated areas where children can play?

    Yes. One of these designated play areas is located landside in the D/E terminal, and the other is located airside, adjacent to Gate C17. These indoor playgrounds have seating surrounding them where parents can sit as they watch their kids run around and have fun, burning off energy before the flight to St. Louis.

  • Where can I park my car at the Portland International Airport (PDX)?

    The most affordable option at PDX is the Economy Lot, which has a free shuttle running between it and the terminals about every 10 minutes. If you want to be a bit closer to the airport and spend a little bit more money, you can opt for the long-term parking spots in Parking Garage P2 and P3.

  • Are there any private places for traveling mothers to nurse at STL?

    Yes. At the St. Louis Airport, mothers who need to nurse or pump can take advantage of the Lactation Suites located airside near Gates C7, E31, and A8. Each of these private rooms includes a comfortable chair for Mom, a table, a bench, a foot rest, an electrical outlet, and a sink.

  • Where can I pick up my rental car at STL?

    All rental car agencies at the St. Louis Airport are located off airport grounds. When you land at STL, proceed to the Arrivals curb where you can catch a free shuttle to the car rental agency where you have reserved a vehicle. These free shuttles stop at Exit 17 outside Terminal 1 and at Exit 12 outside Terminal 2. Some car rental agencies with free shuttle service to STL include National, Enterprise, Thrifty, Alamo, Hertz, Budget, and Avis.

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

    In the last 3 days, the lowest price for a flight from Portland to St. Louis was $72 for a one-way ticket and $191 for a round-trip.

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

    No

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

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

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

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

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

    The Boeing 737-900 Passenger/BBJ3 (winglets) is the aircraft model that flies most regularly on the Portland to St. Louis flight route.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Portland to St. Louis are Southwest and Alaska Airlines. With an average price for the route of $402 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 $425 and an overall rating of 8.0.

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

    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 Portland to St. Louis.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Portland 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 Portland to St. Louis?

    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 St. Louis with an airline and back to Portland with another airline. Booking your flights between Portland and STL 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 Portland to St. Louis?

    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 St. Louis from Portland 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 Portland to St. Louis

  • Looking for a cheap flight? 25% of our users found flights on this route for $114 or less one-way and $242 or less round-trip.
  • Located in the northwestern United States, the Portland International Airport (PDX) is a focus city for Alaska Airlines and Horizon Air. Serving as a hub for a few regional airlines, the St. Louis Lambert International Airport (STL) is located in the center of the midwest.
  • Delta, Frontier, American, and United are among the airlines that offer flights from PDX to STL with one stop. The layover is in cities such as Dallas, Phoenix, Denver, Seattle, Atlanta, Las Vegas, Minneapolis, Chicago, or Los Angeles. Alaska, Spirit,
  • Portland Airport has over 20 teams of therapy dogs and their experienced handlers who roam Departures to bring delight, distraction, and comfort to traveler's waiting for their flight.
  • If you are looking for something interesting to do as you wait for your flight to St. Louis, consider going to the Hollywood Theater, located on the C Concourse at PDX. At this small theater, you can watch short films created by Oregon filmmakers for free.
  • If you need a quiet place to decompress at STL, consider taking advantage of one of the two interfaith chapels at the St. Louis Airport. In these quiet spaces, you can relax, meditate, pray, or recoup. Along with prayer rugs and prayer books, these interfaith chapels offer religious services, empathetic listening, and spiritual guidance.

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

 
See real verified KAYAK customer reviews for airlines flying from Portland to St. Louis. 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 Portland to St. Louis? 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 11801 reviews
8.5Crew
7.0Entertainment
7.1Food
8.1Boarding
7.8Comfort
Airline reviews

Delayed and no entertainment? I also forgot my headphones and immediately reported it and have not heard back yet.

4.0 OkayAnonymous, Jan 2026
PDX - BUR
Read more Alaska Airlines reviews

Delayed and no entertainment? I also forgot my headphones and immediately reported it and have not heard back yet.

The crew was very friendly. Boarding was quick and efficient.

You need categories to note when food and entertainment are not available. Alaska's system would not update flight info on the board for this flight, so there was some confusion after deplaning from the previous flight as to which gate and depart time were accurate for this flight.

we waited for 50 minutes to check a bag and missed a flight. do better.

The flight crew was very professional and pleasant. Our flight was delayed 3 hours, but Kayak informed me in advance

Before I even boarded this old white man , a fat Samoan lady, and a short brown guy were at the desk. They asked if we could have 15 volunteers to get free checked bags cause it was a full flight. I waited in line, I got up to the short brown guy and he asked for my boarding pass and I showed him, he said that he can’t check my bag because I wasn’t given a seat yet. So he had me go to the next line with the old white guy, but before I switched lines I asked him, well if I go to that line, will I be able to check my bag so I waited in line and he said yeah, it doesn’t matter , I’m good. So I switch lines and wait in the line of the old white man, with every guest before me he was very sweet , making small talk, smiling and had great eye contact( all of the people he was talking to was white) I come up and he doesn’t look at me , then says I’ll be right with you, I wait for him to initiate and when he does he’s like what’s up? I was like the man next to you told me I needed to get checked in before I can check my bag. He’s like what’s your last name and I say Valenzuela , and he said we’re not there yet, all while not smiling, no eye contact like he was with the other guests. He said we’re will call you when I get to you. So I go sit down and I’m sitting down for less than a minute and he calls me and someone else. I go up and say Valenzuela and he’s like who are you and I’m like Valenzuela , he’s like hmm and says don’t go anywhere and calls someone else. I finally get my seat and I go back to the short brown man and ask if I can check my bag and he said there isn’t any room available and I was like? Wait you told me and then the fat Samoan lady said yeah we don’t need anymore bags thank you. I was dumbfounded and just walked away. So rude. Terrible experience and terrible communication on their end.

The flight was delayed, but once it arrived everything moved right along.

Coke zero offered...good. The proptness of flight was late. This has been a everytime thing for my last 9 flights. And is putting alot of pressure on my connecting flights. Not a bit punctual. I am always early, but Ak. Airlines is not. And people i happen fly beside, parrot the same thing. The baggage delivery to baggage claim, is not prompt. Its slowwwww. The seats are poorly padded, very crowd. We need more room, not padding the airlines bottom line. Its like a cattle car. More leg room, more side to side room. And attendants need upgrade of verbal skills. I have been faithful to Ak. A., but it will change if changes are not made. Not the only planes in the sky.

Everything was great except for one piece of our luggage was severely damaged and crushed. There were no agents available at baggage claim and the hold time on the phone was over 3 hours. So therefore we were unable to file a complaint. We will be speaking to Alaska Airlines about replacing our luggage when we check in for our return flight.

Great airline. Sat next to a really big person tho

All good except once again bags took an hour at Midway Airport Happens all the time. Ridiculous

Everything went smoothly and we even arrived a little bit early.

Great vacation. Can't wait till next year for another one.

Great flight but super high price. Glad it was a business trip and not personal

On time. Friendly staff. Took to long to pre bord all the specialty groups. Cramped small plane

The seats were comfortable, and the boarding process was pretty smooth.

3 hour delay. Had to change plans and was still delayed.

The staff was very friendly, professional, and courteous. The overall flight was a great experience.

The crew canceled the complementary snack and drink in anticipation of turbulence that never materialized. I was counting on the drink (water) to take the the doses of medication - prescribed for my heart condition - that were due during the flight. Since no snack or meal was served on this flight, I cannot rate the food quality. Otherwise, this flight was excellent.

Departure was delayed more than 1/2 hour while we waited for luggage (only) transfer from another flight/plane. Once approved for takeoff, the flight was excellent.

The service from the flight attendants were of supreme quality. They greeted and treated everyone with a wide smile. This is totally absent nowadays. Kudos to them!!!!

Excellent flight and got us around tough weather. Only issue was seat TV did not work and crew tried to reboot.

Very large passenger too space from my own seat. Arm board couldn’t be lowered because of his size. It wads very uncomfortable trip, as the flight was full couldn’t move anywhere having back pain because of the position in which I was the entire flight.

was sitting in the jet bridge for 10 minutes in -20 degree weather waiting for my bag

Outdated equipment in disrepair, wifi inoperable. Broken seats, taped air vents, generally poor condition, the 717 showed its age and lack of upkeep.

My flight out of Baton Rouge to Atlanta was delayed by a half hour. This got us into Atlanta airport 30 minutes late. I ran through the airport to get to my connecting flight. As I approached the boarding gate, I saw the boarding door was still open and a passenger was being checked in. But when I got to the gate, the boarding agent told me they had already given away my seat and there were no empty seats on that flight. So I had to take a later flight. That has never happened to me before. Very frustrating.

Connection through Atlanta was difficult. Mechanical issue on plane caused a two hour delay. New gate was a mile away.

No WiFi. Comfort plus should have alcohol provided, crew only offered water or tea. Who the heck wants tea?

The flight was delayed and oversold. I volunteered to give up my seat for compensation. Thinking I could get a good night's sleep instead of arriving home at 2 am. It took over an hour to get the new reservation confirmed, three different gate attendants, and two red coats. It took even longer to confirm the overnight hotel, and when I arrived, the line was 45 minutes long, with two people checking in, and at least 15 people slowly, very slowly—no food except frozen convenience food, no coupon for food from airlines. Slept, headed back to the airport, and that flight had an equipment change and a gate change just as they were about to board. It took an additional hour to board as they cleaned the plane from storage.

There was no wifi available on this flight. And there were no screens, no onboard entertainment, no entertainment options at all. It was like travelling in the 1990s again, except without even a main screen for options. Seats, as usual, were tight and uncomfortable.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

The flight crew where really good. Better then the crew from BNE to SFO

Delayed, toilets did not flush, pilot parked to far away from Gate

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

The plane was experiencing problems with the HVAC system, it was very cold in the front of the plane and very hot in the back.

The attendants were kind and helpful. A sugar-free drink would have been very welcome.

Pilot navigated severe weather/snow storm with skill. Described his intentions clearly

one crew said "he" didn't serve double alcohol drinks for travelers in exit rows. crew on prior flight did. Is this a AA rule, and the prior crew was being nice? Also, I think we deserve more than a 25% refund for losing first class seats when rescheduling a flight due to weather

It was a little concerning to hear the ground crew arguing with the flight crew over baggage space. Instead of taking them and checking them, they started checking for space in the first class cabin moving items around like the flight crew didn't know what they were doing. I was embarrassed for them.

2 hour delay due to equipment failure. No updates via the app and airport screens (which continued to show a departure time in the past). AA eventually switched planes and the new plane was not catered or cleaned correctly.

I booked an aisle seat and was given a middle. At 6'4" 230lbs, it is not ideal to fly in the middle row for myself and passengers.

Trip delayed for 2 hours because of rain. We boarded and have to get down the flight and reboard again.

The aircraft had several problems - from excess fuel to non operational ac. Two hours of delay in Chicago could have been avoided with proper planning and aircraft maintenance.

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

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

Information on your arrival and departure airports