PDX - STL

$128 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 11/4. 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

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, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Portland to St. Louis, as well as popular online travel agencies
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Flights 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

Wed, Oct 1 - Tue, Oct 7
Frontier Logo
6:05 am - 9:07 amPDX-STL
25h 02m1 stop
Frontier Logo
7:52 pm - 10:39 pmSTL-PDX
28h 47m1 stop
$244Frontier
Find Deal
Tue, Jul 15 - Mon, Aug 11
Frontier Logo
7:01 pm - 9:11 amPDX-STL
12h 10m1 stop
Frontier Logo
7:29 pm - 12:16 amSTL-PDX
6h 47m1 stop
$273Frontier
Find Deal
Wed, Aug 13 - Wed, Aug 20
American Airlines Logo
3:22 pm - 12:16 amPDX-STL
6h 54m1 stop
American Airlines Logo
1:42 pm - 11:20 pmSTL-PDX
11h 38m1 stop
$282American Airlines
Find Deal
Thu, Jul 10 - Mon, Jul 21
Delta Logo
12:40 am - 8:34 amPDX-STL
5h 54m1 stop
Delta Logo
5:37 pm - 11:18 pmSTL-PDX
7h 41m1 stop
$297Delta
Find Deal
Fri, Sep 12 - Tue, Sep 16
Delta Logo
12:40 am - 8:44 amPDX-STL
6h 04m1 stop
Delta Logo
7:30 am - 5:06 pmSTL-PDX
11h 36m2 stops
$301Delta
Find Deal
Sat, Aug 23 - Sun, Aug 31
United Airlines Logo
5:00 am - 3:44 pmPDX-STL
8h 44m2 stops
United Airlines Logo
5:15 am - 9:28 amSTL-PDX
6h 13m1 stop
$302United Airlines
Find Deal
Fri, Jul 11 - Fri, Jul 18
Southwest Logo
5:50 am - 3:00 pmPDX-STL
7h 10m1 stop
Southwest Logo
2:50 pm - 8:00 pmSTL-PDX
7h 10m1 stop
$307Southwest
Find Deal
Wed, Aug 27 - Thu, Sep 11
Southwest Logo
7:00 am - 5:40 pmPDX-STL
8h 40m2 stops
Southwest Logo
5:25 am - 10:00 amSTL-PDX
6h 35m1 stop
$312Southwest
Find Deal
Thu, Jul 31 - Sun, Aug 3
American Airlines Logo
12:59 am - 9:18 amPDX-STL
6h 19m1 stop
American Airlines Logo
5:30 am - 12:53 pmSTL-PDX
9h 23m1 stop
$369American Airlines
Find Deal
Fri, Jul 11 - Fri, Jul 18
United Airlines Logo
7:37 am - 4:45 pmPDX-STL
7h 08m1 stop
United Airlines Logo
8:00 am - 3:14 pmSTL-PDX
9h 14m1 stop
$387United Airlines
Find Deal
Expert advice

Expert advice for your flight from Portland to St. Louis

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
PDX

PDX offers easy navigation with a single main terminal and clear signage, ensuring a smooth check-in and security process.

Read more about PDXby Gabriel Leigh
STL

Use MetroLink for a convenient and cost-effective way to reach downtown St. Louis from STL.

Read more about STLby Yulia Denisyuk
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
Useful Info

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 Fridays and avoid leaving on a Saturday, as it's usually the priciest day. When flying back from St. Louis, Tuesday is the cheapest day to fly and Saturday 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 January, where tickets cost $280 (return) on average. On the other hand, the most expensive months are December and March, where the average cost of round-trip tickets is $500 and $488 respectively.

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. For the absolute cheapest price, our data suggests you should book 25 weeks before departure.

Good to know

Low seasonJanuary
High seasonJune
Cheapest flight$128
Best time to beat the crowds with an average 27% drop in price.
Most popular time to fly with an average 5% 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 $128 for a one-way ticket and $244 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?

    Alaska Airlines, JetBlue, and Delta 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 737-800 Passenger/BBJ2 (winglets) is the aircraft model that flies most regularly on the Portland to St. Louis flight route.

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

    You can catch a nonstop flight from Portland to St. Louis on on Saturday, and Sunday.

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

    The two airlines most popular with KAYAK users for flights from Portland to St. Louis are Delta and Southwest. With an average price for the route of $367 and an overall rating of 8.0, Delta is the most popular choice. Southwest is also a great choice for the route, with an average price of $459 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 $499 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.

Prefer to fly direct from Portland to St. Louis?

Find which airlines fly direct from Portland Airport to Lambert-St Louis Airport, which days they fly and book direct flights.

Direct departures

Portland to Lambert-St Louis

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Direct returns

Lambert-St Louis to Portland

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights
See more direct flights

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 10000 reviews
7.1Food
8.1Boarding
8.5Crew
7.1Entertainment
7.8Comfort
Airline reviews

On time, smooth take off and landing, efficient boarding. Gate staff excellent, stewardess grumpy, but civil enough.

10.0 Excellentmarlene, Jun 2025PDX - SMF
Read more Alaska Airlines reviews

On time, smooth take off and landing, efficient boarding. Gate staff excellent, stewardess grumpy, but civil enough.

No WiFi available. It was too late to order food also. Guy next to me was huge (not fat) so had his shoulder & thigh next to me the whole way. Plane was delayed leaving PDX due to 8 other planes waiting. Not my best Alaska airlines flight.

Check in, they should have told me that upon arrival i needed to exit the secure area and re-check in with Eva Air. I wasn't sure what to do upon arrival at S.F.

The direct service from Logan to PDX made travel so easy, I really appreciate this route. Pilots were very communicative with passengers about conditions and expectations. Everyone on staff was pleasant and helpful. Boarding was easy and efficient.

Flight last minute delayed 2 hours for crew calling out sick

Husband was new to the wheelchair accommodations this trip. What a blessing that was. All employees were helpful and customer service was excellent

Seats are still too crowded and uncomfortable on long flights like this cross country one.

Laney was very helpful. I am computer illiterate. She helped me obtain a boarding pass and preferred seat. She was warm, friendly, helpful, and smiled. I was impressed.

The actual flight I was rescheduled onto was from Seattle to Bozeman. The flight itself was fine, but due to delays/air traffic issues i spent the day hanging out at the Seattle airport and had to miss a day of work.

OUr pilot was very good and also a good landing in a very gusting Phoenix. Most important.

Southwest is typically delayed, and it gets wearisome. It is no longer a discount airline and you get way less than you pay for when it comes to comfort and Ce.

We sat on the plane on the tarmac for 4 hours.

I'm not a fan of Southwest's model. I don't like the herding style of boarding.

Flight crew and cabin crew were great. I had to rearrange flights because my original flight was 3hrs delayed for weather, the rub is the flight I moved to boarded on time then we sat at the gate for 2 hours because scheduling stole our first officer for another flight, TWICE. Then our actual FO was an hour delayed. To make it worse my original flight went from a 3 hour delay to departing 15min EARLY. Just poor scheduling operations all around.

Bring back peanuts Take our drink orders when were all seated, especially after you switch to assigned seating.

Staff was far less than helpful at all times. Departure and arrival times mean nothing to Southwest. Extremely disappointed, will never fly with them again, and I’ll be sure to share my experience with all.

It is southwest seat was ok. Not the most comfortable seat

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

The price of the tickets isn't matching the flight experience. No matter how long the flight is, you're only getting pretzels. The flight attendants looked unkept and over it.

Plz don't take away free bags and free seating

Great overall. There was a bit of turbulence so they could only serve water because too much turbulence for the carts. Was glad they prioritized safety though

Excellent flight, the planes were newer, they did a nice job with boarding, great service overall.

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

Amazing flight! I have never noticed the uniforms of the attendants before in twenty years of flying except today when one female had the most amazing dress on. It was beautifully designed and showed she was in charge. I never dreamed I would google who designed Delta uniforms . The ultimate compliment is when another woman admires your outfit. . I hope your designer puts it on the market

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

My flight was 6 pm 6/6. Every hour they delayed it again - air condition issues then no pilot then the crew had worked too many hours and cancelled the flight at 11 pm. Sent customers to NJ a 45 minutes uber ride to a hotel. Had to be back by 5 am for a 7 am flight and again no pilot etc with another three hours of delays.

The entertainment and wifi mostly didn't work on this flight.

Terrible entertainment system - kept freezing and audio kept cutting out. Snacks were mediocre at best for a 5 hour flight.

The check in and bag drop off for Sky Priority members is slow. The Clear security was also slow - a TSA issue.

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

Very comfortable (upgraded to business class). The audio on my screen didn’t work, but I managed to play the audio through my phone while watching the screen.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

I liked that the flight was nonstop from ORD to CIU for $200 round trip.

Smooth flight, especially take off and landing, and great crew on board. Really loved the stroopwaffles!

5.5 hour delay with no explanation on why, along with no proactive effort to reaccomodate me.

It was one of my worst flight ever. First they were changing the gate for at least 4 times, changing from gate D7 to D12 to D44. Considering the size of the Miami Airport, we are talking about long distance and the train at the airport was not working. Then the flight was delayed around one hour. Then finally we boarded into the plane and when everybody was seated, there was an announcement that there is an issue with one of the tire of the plane, so we all had to get out of the plane with our belongings, to replace the tire. So we had around 2.5-hour delay

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

The plane was probably full boarding was easy. We were able to check our carry-on luggage for free. It was a return flight through Philly to LA. Never saw a stewardess do a demonstration of emergency Procedures. I think my flight was pretty full

Plane, flight, crew, captain were all great. The first flight had a Chipotle box lunch...delicious.

Plane, flight, crew, captain were all great. The first flight had a Chipotle box lunch...delicious. this return flight not as tasty, but filling.

The flight was 2 hour delayed, otherwise everything was excellent. The delay was due to the hourly limit requirement so given that as a reason, I'm happy with the flight!

Weather delay for 2.5 hours followed by half hour crew delay, did not have ginger ale, uncomfortable seats

So awful Unreliable Unfriendly Bad Mad Mean Smelly Hot Late Overbooked Understaffed Expensive Cramped Narcs If they were a fruit they’d be rotten durian

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

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