PDX - STL

$84 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 4/15. 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
$214
Overall average: $338
Frontier
Wed 4/15Sat 4/18
PDX - STL • 2 stops
Cheapest non-stop
$269
Alaska Airlines
Fri 5/22Tue 5/26
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 $214 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Alaska Airlines. Average duration is 0
Direct flights
Direct flights
+1
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Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $311 (round-trip)
Shortest trip • 5h 53m (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 45% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 17% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
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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

Wed, Apr 15 - Sat, Apr 18
Frontier Logo
12:28 pm - 10:30 am
PDX
-
STL
20h 02m
2 stops
Frontier Logo
8:17 pm - 10:20 am
STL
-
PDX
16h 03m
1 stop
$214Frontier
Mon, Apr 13 - Sat, Apr 18
Frontier Logo
11:58 am - 11:19 pm
PDX
-
STL
33h 21m
2 stops
Frontier Logo
8:17 pm - 10:20 am
STL
-
PDX
16h 03m
1 stop
$215Frontier
Wed, Apr 22 - Sat, Apr 25
American Airlines Logo
1:23 pm - 11:46 pm
PDX
-
STL
8h 23m
1 stop
American Airlines Logo
5:21 pm - 10:57 pm
STL
-
PDX
7h 36m
1 stop
$217American Airlines
Thu, Apr 16 - Sat, Apr 18
Frontier Logo
11:48 am - 7:21 pm
PDX
-
STL
5h 33m
1 stop
Frontier Logo
8:17 pm - 10:20 am
STL
-
PDX
16h 03m
1 stop
$221Frontier
Fri, Apr 10 - Fri, Apr 17
Frontier Logo
11:58 am - 9:48 am
PDX
-
STL
19h 50m
1 stop
Frontier Logo
8:06 pm - 11:42 am
STL
-
PDX
17h 36m
1 stop
$223Frontier
Sat, Apr 18 - Sat, Apr 25
Frontier Logo
12:27 pm - 6:50 am
PDX
-
STL
40h 23m
2 stops
Frontier Logo
8:17 pm - 10:20 am
STL
-
PDX
16h 03m
1 stop
$226Frontier
Tue, Apr 14 - Wed, Apr 22
American Airlines Logo
11:47 pm - 8:24 am
PDX
-
STL
6h 37m
1 stop
American Airlines Logo
7:05 am - 12:33 pm
STL
-
PDX
7h 28m
1 stop
$227American Airlines
Mon, Apr 13 - Mon, Apr 20
Frontier Logo
11:58 am - 11:19 pm
PDX
-
STL
33h 21m
2 stops
Frontier Logo
8:17 pm - 11:52 am
STL
-
PDX
17h 35m
1 stop
$228Frontier
Thu, Apr 16 - Sat, Apr 18
American Airlines Logo
3:16 pm - 11:46 pm
PDX
-
STL
6h 30m
1 stop
American Airlines Logo
5:21 pm - 11:57 pm
STL
-
PDX
8h 36m
1 stop
$237American Airlines
Thu, Apr 9 - Thu, Apr 16
Multiple Airlines Logo
1:35 pm - 11:59 pm
PDX
-
STL
8h 24m
1 stop
Multiple Airlines Logo
9:55 pm - 8:59 am
STL
-
PDX
13h 04m
1 stop
$239Multiple 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 Fridays 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 June, where the average cost of round-trip tickets is $480 and $402 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 $316, 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 45% 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$84
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly and prices are also 3% lower on average.
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 $84 for a one-way ticket and $214 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.

  • 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 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 $396 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 $361 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 $163 or less one-way and $229 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

Alaska Airlines

Sunday

Alaska Airlines

Alaska Airlines

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

Alaska Airlines

Sunday

Alaska Airlines

Alaska Airlines

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 4318 reviews
8.1Boarding
8.0Comfort
7.0Food
8.6Crew
7.5Entertainment
Airline reviews

Long layover between flights to Long Island from BWI - need better coordination between flights

4.0 OkayKenny, Mar 2026
TPA - BWI
Read more Southwest reviews

Long layover between flights to Long Island from BWI - need better coordination between flights

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

I realize they are still working out kinks with the new boarding process, but by the time I boarded in group 5, most of the bins were full. All airlines should better enforce small bags and jackets going under the seats until everyone has boarded.

WiFi was not working and didn’t have a beverage service

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

Flight boarded late after announcing on time boarding. Flight arrived only a little late despite late departure. Had trouble connecting to WiFi

Never got on because first part of trip was cancelled and we have no idea when we will get rebooked…

Wonderful as always! Pleasant staff, smooth ride, and timely departure.

Everything ran like it should. Staff was professional. Looking forward to flying with them again.

Liked the attention and speed when getting wheelchair..........Was assured by phone that my needs would be taken care of and they were with my name.

The seats were spacious and comfortable. Even in basic economy. However, the flight boarded 30 minutes late.

Alaska used to be a top notch airline. With it's growth it is now in line with the big airlines. Not bad, not great.

Great. I did have a little issue getting into the Lounge, which is likely more an American Airlines issue. I did not carry my physical AAdvantage Executive credit card with me on this trip, which Admirals Club membership is a part of the benefits of having this card. The instructions on the AA website and the Citi cards website make it seem like you don't need the physical card, as both sites state you can enter with your boarding pass and driver's license. But both lounges said you were required to present the physical card (and not the digital version, via Apple Pay), as only the physical card says "Admirals Club" on the back.I also do not have a physical Admirals Club membership card, so while both lounges eventually let me in, both denied me entrance initially for this reason.

Everything from the time I booked my flight through to the end when I got home was smooth and wonderful. Service was great, the flight attendants were attentive and there were no outstanding delays.

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.

We landed and sat on the tarmac for 45 minutes because they only have one gate at the airport and there was another plane running late so we had to wait

The WiFi was not working. That made for a long flight.

Absolutely no communication on why there's a delay and multiple flight time reschedules. I would have canceled the flight and drove back home if I known it was going to be rescheduled 3 or 4 times.

Another late night flight and MORE men belligerently drinking and yelling. I had to move from first to economy because they were so obnoxious and disruptive. Crazy to go from a cozy chair to cardboard when you were supposed to be in first. Delta allows was too much drinking which leads to belligerent behavior.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Love delta smaller commuter plane so no entertainment and paid wifi on MKE-LGA leg was extremely unreliable and slow

Stop changing gates. Stop cancelling flights Stop moving my seat.

Extremely disappointed with Delta. They canceled flight last minute and then I rebooked the other flights and with which were delayed as well

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

The flight was flying with 30% capacity. The flight my seat from preferred seating to back of the seat. Even though i can understand that this was to balance the flight weight. The flight attendance decided to do the serving near my seat and in the middle , their noices woke me up from sleep , when i realized that the service has ended and when they were going back asked for a coffee, for which they answered they have completed teh service in my location. That really upset me as they woke me up and also rejected the coffee i asked. I ended up landing with a headache, thanks to the crew that screwed up my travel

Everything was on time and service on the flight was great!

Wifi Bluetooth features for watching in flight movie was horrible. Screen kept blacking out no connection of sound although it said connected. Other than that smooth trip .

The travel company that you have on your site did me so wrong. I don’t know how it happened, but they put my son‘s name on my plane ticket flying to Vietnam. Along with his birthday. They would not have let me fly from Fort Myers to Ho Chi Minh City. I don’t think that I can ever use your service again. I typed my information into the browser along with my passport number and four days before I’m leaving I have to quickly search another ticket to fly out here.

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

It’s always a great time flying with united airlines.

Good flight. Efficient boarding and competent flight crew. No problems until we arrived at our destination gate. We were early so there was an aircraft at the gate that had to move before we could pull in. Then, due to the type of aircraft we flew, the cabin door could not be opened until some luggage from the cargo bay was offloaded to preserve center of gravity characteristics. So, that further delayed deplaning. Despite being 20 minutes early on landing, we ended up being 5 to 10 minutes late after all the delays.

Everything went well except the turbulence what no one have a control of but pilot and crew handled very good!

There was no WiFi available, there were mechanical problems with the plane and we landed at C 124, then the gate was switched to A 26, then all the way back to C126! For a 75 yo woman traveling alone, this was a difficult journey, indeed!

This trip did not start off well. The inbound flight was delayed about 20 minutes. Then, after initial onboarding, the passengers had to deplane due to a mechanical problem. That took about 30 minutes to fix and be cleared. Then, reboarding was chaotic. It took a long time to sort passengers and two passengers on standby were ticketed but there was no seat. So, they had to deplane. One of the flight crew was trying to help passengers figure out a place to put their carry-on bags and that took more time. In the end, our scheduled 10:30 am departure did not actually take off until about 12:05 pm CST. The flight itself was long but we got to Houston. Some passengers missed their connecting flights and had to rebook. Not the best of flights I've had.

Easy boarding. Rows are smaller but that may be an older and bigger me now :)

It would have been nice if American tried to care.

American Airlines did everything they could with the high Spring Break crowd. I was frustrated to be changed from 1st class to a middle seat at the back of the plane. This has happened before, not sure booking 1st class and paying the extra actually works.

I booked 1st class, my flights were changed and I was sitting in the middle at the back of the plane. A far cry from the 1st class I purchased for my flights. I am grateful I arrived on time.

There was no beverage service and the only time I saw a crew member walk through the cabin is when we were preparing to land.

Our flight was delayed 3 times and this is why I am giving such low reviews. Everything else was okay but being in the airport at 4:30pm for my initial flight at 7pm to not leave until after 9:30pm is insane,

Flights were constantly delayed. CRW took 50 minutes to get bags

Flight has been delayed every time I've ever taken it. Seats uncomfortable. Children behind me yelling the entire flight. Some of this is out of their control but overall just consistently not a great experience.

Check in was rough because the check in crew did not know how to manage my international visa documents. Required a long process and 4 people to finally be able to proceed to security. They told us incorrect information several times before acknowledging we did indeed have everything we needed from the start.

Where do I start!! I was delayed with my flight from Dallas to Tampa. On the way back from Tampa to Dallas the flight was delayed over 4 hours+. I was put on another flight that was also delayed but not as long. Traveling on American Airlines is becoming exhausing.

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

Information on your arrival and departure airports