PDX - STL

$82 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 5/26. 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
$221
Typical prices: $497-$291
Frontier
Sun 5/10Wed 5/20
PDX - STL • 1 stop
Cheapest non-stop
$277
Alaska Airlines
Wed 6/3Sat 6/6
PDX - STL • Non-stop
Advice from real travelers
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
Cheapest • from $221 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Alaska Airlines and Southwest. Average duration is 4h 00m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $283 (round-trip)
Shortest trip • 5h 54m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 5 weeks in advance save around 42% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 19% price drop
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
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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

Sun, May 10 - Wed, May 20
Frontier Logo
9:46 pm - 8:23 pm
PDX
-
STL
20h 37m
1 stop
Frontier Logo
6:51 pm - 10:20 am
STL
-
PDX
17h 29m
1 stop
$221Frontier
Thu, May 28 - Sun, May 31
Frontier Logo
12:35 pm - 7:23 pm
PDX
-
STL
28h 48m
1 stop
Frontier Logo
8:08 pm - 4:46 pm
STL
-
PDX
22h 38m
1 stop
$241Frontier
Mon, Jun 1 - Sat, Jun 6
Multiple Airlines Logo
11:15 am - 8:11 pm
PDX
-
STL
6h 56m
1 stop
Multiple Airlines Logo
5:33 pm - 7:50 pm
STL
-
PDX
4h 17mnonstop
$244Multiple Airlines
Thu, May 28 - Sun, May 31
Frontier Logo
12:35 pm - 7:23 pm
PDX
-
STL
28h 48m
1 stop
Frontier Logo
8:08 pm - 4:46 pm
STL
-
PDX
22h 38m
1 stop
$261Frontier
Thu, Jun 4 - Sat, Jun 6
Multiple Airlines Logo
11:15 am - 8:11 pm
PDX
-
STL
6h 56m
1 stop
Multiple Airlines Logo
5:33 pm - 7:50 pm
STL
-
PDX
4h 17mnonstop
$270Multiple Airlines
Fri, May 29 - Fri, Jun 5
Multiple Airlines Logo
12:35 pm - 7:23 pm
PDX
-
STL
28h 48m
1 stop
Multiple Airlines Logo
5:33 pm - 7:50 pm
STL
-
PDX
4h 17mnonstop
$275Multiple Airlines
Wed, Jun 3 - Sat, Jun 6
Alaska Airlines Logo
10:37 am - 4:37 pm
PDX
-
STL
4h 00mnonstop
Alaska Airlines Logo
5:33 pm - 7:50 pm
STL
-
PDX
4h 17mnonstop
$277Alaska Airlines
Fri, Jun 19 - Mon, Jun 29
Frontier Logo
6:19 pm - 2:06 pm
PDX
-
STL
17h 47m
1 stop
Frontier Logo
8:08 pm - 4:35 pm
STL
-
PDX
22h 27m
1 stop
$281Frontier
Fri, May 29 - Sat, May 30
Alaska Airlines Logo
10:37 am - 4:37 pm
PDX
-
STL
4h 00mnonstop
Alaska Airlines Logo
5:33 pm - 7:50 pm
STL
-
PDX
4h 17mnonstop
$283Alaska Airlines
Tue, Jun 9 - Tue, Jun 23
Frontier Logo
5:20 pm - 7:23 pm
PDX
-
STL
24h 03m
1 stop
Frontier Logo
8:08 pm - 11:41 am
STL
-
PDX
41h 33m
2 stops
$285Frontier
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.

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

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

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 Wednesdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from St. Louis, Tuesday is the cheapest day to fly and Monday 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 April, where the average cost of round-trip tickets is $462 and $425 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.

No, with an average price for the route of $354, prices are generally cheapest when you fly direct.

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 5 weeks before departure, which saves you about 42% 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$82
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly with an average 1% 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.

  • How many flights are there between Portland and St. Louis per day?

    There is a maximum of 1 nonstop flight a day that takes off from Portland and lands in St. Louis, with an average flight time of 4h 00m. The most common departure time is 10:00 am and most flights take off in the morning. Each week, there are 7 flights.

  • 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 $82 for a one-way ticket and $221 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, 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 MAX 9 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?

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Portland to St. Louis are Southwest and Delta. With an average price for the route of $422 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $378 and an overall rating of 7.9.

  • 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 $144 or less one-way and $309 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?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Portland to Lambert-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

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

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

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
SouthwestOverall score based on 4314 reviews
8.0Comfort
8.6Crew
7.0Food
8.1Boarding
7.5Entertainment
Airline reviews

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

10.0 Excellentlarry, Apr 2026
LGB - PHX
Read more Southwest reviews

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

no service at all due to turbulence. they should've at least given us snacks, there were only 10 people on the entire flight.

First time I've had to use the disabled accommodations. And I could not have had a better experience with Southwest, i was having trouble getting from one terminal to another due to my heart failure. And the next thing I know a Southwest agent had made sure. I had a wheelchair at all my flights. Can't thank them enough.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

We waited in the airplane for over 45 min for a southwest employee to make the flight. This cause over half the plane to miss their connecting flight in Denver. When we confronted the desk upon arrival, they told us the only flight they had was the next day leaving at 8:50 pm!!! Or they offered to get us to Burbank or LA, but after that we were on our own to get back to Santa Barbara. I paid for a flight from sba to bna bna to sba. My re entry into mom mode has been 💯 rough because of southwest mistake with my flight. And now I’m leaving to Reno tomorrow for a vballl tournament and just discovered that my leg in Vegas has me and my 3 kids on a stand by flight even though I had booked these ticket last year November!! Do better southwest!

Southwest is kind of a slum airline. It’s gotten more expensive over the years for less and less service. I am a Southwest Chase Visa card holder and was forced to choose a seat in the 26th row in the middle seat. However my wife who is a rewards member but doesn’t hold a card or anything else, gets randomly assigned a normally paid seat in row 6! How does that work?

For the first time in a long time, the Wi-Fi actually worked the entire flight! The flight crew was amazing as usual.

very nice blankets and comfortable seats. great service. Great flights.

great experience just at the end, we got in early and there wasn't anyone at the gate for 30 min so we had to just sit on the tarmac

Generally Good. Outbound flight was marred by a continuously s creaming baby. Fortunately the flight was only 90 mins long it would be nice if people traveling with small childres could be centered in one part of the plane. Also, you need to adapt your servey to include a "not applicable " option for things like food and entertainment, which are not offered on shorter flights. I fily Alaska by choice as given all the cirumstances, I fel\el you do a good job.

I was seating in 26A and the children in 27A and B were kicking me non-stop. They kicked me for hours nonstop and the parents refused to get off their phones or correct them. I kindly asked multiple times and got screamed at by the mom that her son is disabled. I told her I get it, but that I matter too and she is responsible for her child. He then kicked me so hard my drink spilled. Not one crew member or other passenger said or did a thing. It was so horrible.

Birding was slow. extremely slow; please do experiments on efficient plane boarding experiences; especially regarding passengers that pass their seat number…

Pretty smooth ride!… a little tight in the back and would’ve loved to had a movie screen… couldn’t beat the price to the West Coast!

I like not much people. Could tell the kids to be quiet.

I liked everything except, I left a brand new Switch 2 on the plane and talking to anybody about it is nearly impossible. I had to fill out a form and hope they get back to me in the next 2 weeks. I really hope they contact me. I saved for that thing for over a year and my son is heart broken.

Fight attendant excellent Food very good, not great Seats were stiff and uncomfortable Flight was overall very nice. Last three flights were burdened with miserably uncomfortable seats. Hard stiff no padding.

The ground crew was very good. They communicated clearly and continued updating. The flight crew was fine. The flight crew on the March 20th flight from MCI to Portland was excellent.

The agent at check in and at the gate were less than thrilled to be at work. I'm not a fan of Kayak's placement on the plane. I got put in the middle seat and none of my preferences were used.

In ATL they have two sets of departure screens. Follow what is on your airline's departure board - the ATL Airport Authority departure board had completely incorrect details about the gate assignment for my flight, which would have made me miss boarding.

Flight was delayed it was hot while sitting on the plane, one engine was working on the plane until they had to do some jimmy rigging down the runway in order for the other engine to charge up. It was ridiculous

The flight was very good and the staff was very friendly and helpful!

The only thing I would say is we tried to get on a standby earlier flight, but with our fair we couldn’t. That seems senseless to leave with open seats..

Very easy to use and convenient, you can perform any action within the same portal

In a world of delays, Delta was on time both ways! Boarding was fast and efficient. Staff was friendly. AND wifi worked.

WiFi didn’t work. Flight delayed 3 hours Crew members were illiterate Seat lean back did not work.

Flight was delayed, we could have been notified earlier and in a consistent manner. App was not refreshing for another passenger to get the latest flight status. We could have stayed and waited at the hotel instead of waiting at the airport had we known the flight was going to delayed for more than 5 hours. The toilet is too tight, and needs to be cleaned more frequently (every hour). The entertainment screen froze, the touch screen not responding to touch. We were upgraded to comfort, it is more comfortable than regular economy seats.

This wasn't my experience with Delta. It was just the Pegasus flight. Seats were very hard. Staff was kinda rough. Not very nice. Charged me for snacks. For a 4 hour flight I would've expected more.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

They told us yesterday APR21st that they were cleaning the plane and we got delayed. After that they said they didn't had any crew for the flight so they cancelled the flight till next day.

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

The flight crew on this leg of my trip was very friendly and pleasant. Every one of them was humorous, as well as helpful and accommodating. This group was BY FAR the best crew I’ve flown with. They deserve kudos.

Left early arrived early..right amount of talking from pilots..of course had to love the biscuit and water!

I would like a refund for the extra cost the seat I paid for. An oversized person sat next to me and I couldn’t fit on my seat and had to move to another seat.

Boarding gate at LAX was too crowded—two gates next to one another

The flight was delayed about an hour for a maintenance specialist to approve the maintenance repair

This flight was delayed but it worked in my favor because my Atlanta to Dallas flight was delayed.

This was a hard flight. 3 delays out of OKC (1 on the Tarmac). Delay in Atlanta coming to Dallas. total travel time was the equivalent of driving from OKC to Atlanta.

Like: flights are on time, good boarding process Can improve: planes are old, improve entertainment and make space more comfortable

Had to wait for a gate for a long time, then waited on the run way for a long time before leaving. The actual flights part was good.

The airplane was an old model, the overhead didn’t have enough room for people’s items and made boarding and boarding disappointing and stressful. Crew allowed passengers to bring more than the permitted baggage sizes.

Flying in the United States with the major airlines has become so underwhelming. A 2-3hr flight in most other parts of the world with the major carriers of the area comes with newer, CLEANER aircraft and significantly better in flight service in terms of both staff attitude and a actual meal service.

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

Information on your arrival and departure airports