PWM - STL

$168 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 3/7. 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, 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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Everything you should know

Cheapest round-trip
$316
Overall average: $370
American Airlines
Wed 4/1Sat 4/4
PWM - STL • 1 stop
Cheapest one-way
$168
Typical prices: $228-$455
Delta
Sat 3/7
PWM - STL • 1 stop
Top airlines
American Airlines
Cheapest • from $316 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
September
Cheapest • 24% price drop
April
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Portland to St. Louis (PWM-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 1 - Sat, Apr 4
American Airlines Logo
6:17 am - 11:35 am
PWM
-
STL
6h 18m
1 stop
American Airlines Logo
8:00 am - 11:34 pm
STL
-
PWM
14h 34m
1 stop
$316American Airlines
Thu, Apr 9 - Tue, Apr 14
American Airlines Logo
5:51 pm - 11:46 pm
PWM
-
STL
6h 55m
1 stop
American Airlines Logo
8:54 am - 5:21 pm
STL
-
PWM
7h 27m
1 stop
$317American Airlines
Wed, Apr 1 - Sat, Apr 4
Southwest Logo
12:30 pm - 8:00 pm
PWM
-
STL
8h 30m
2 stops
Southwest Logo
6:40 am - 12:30 pm
STL
-
PWM
4h 50m
1 stop
$322Southwest
Mon, Apr 20 - Tue, Apr 28
American Airlines Logo
5:51 pm - 11:46 pm
PWM
-
STL
6h 55m
1 stop
American Airlines Logo
12:25 pm - 12:13 am
STL
-
PWM
10h 48m
1 stop
$329American Airlines
Thu, Apr 9 - Tue, Apr 14
American Airlines Logo
7:07 am - 11:45 am
PWM
-
STL
5h 38m
1 stop
American Airlines Logo
3:43 pm - 11:54 pm
STL
-
PWM
7h 11m
1 stop
$335American Airlines
Wed, Apr 15 - Mon, Apr 20
Delta Logo
4:42 pm - 8:42 pm
PWM
-
STL
5h 00m
1 stop
Delta Logo
6:48 am - 4:45 pm
STL
-
PWM
8h 57m
2 stops
$340Delta
Wed, Apr 15 - Mon, Apr 20
Delta Logo
4:42 pm - 11:34 pm
PWM
-
STL
7h 52m
2 stops
Delta Logo
6:48 am - 4:45 pm
STL
-
PWM
8h 57m
2 stops
$345Delta
Fri, Apr 10 - Mon, Apr 13
Delta Logo
4:48 pm - 8:42 pm
PWM
-
STL
4h 54m
1 stop
Delta Logo
5:27 pm - 11:24 pm
STL
-
PWM
4h 57m
1 stop
$371Delta
Fri, Apr 10 - Mon, Apr 13
Southwest Logo
4:50 pm - 11:25 pm
PWM
-
STL
7h 35m
1 stop
Southwest Logo
5:40 am - 2:10 pm
STL
-
PWM
7h 30m
2 stops
$376Southwest
Thu, May 7 - Sun, May 10
American Airlines Logo
5:51 pm - 10:19 pm
PWM
-
STL
5h 28m
1 stop
American Airlines Logo
5:21 pm - 11:27 pm
STL
-
PWM
5h 06m
1 stop
$393American 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 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 September, where tickets cost $333 (return) on average. On the other hand, the most expensive months are November and May, where the average cost of round-trip tickets is $577 and $568 respectively.

Good to know

Low seasonMarch
Cheapest flight$168
Best time to beat the crowds with an average 16% 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

  • 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 $168 for a one-way ticket and $316 for a round-trip.

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

    No, a passport isn't needed to fly from Portland to St. Louis. However, local authorities might ask for an official ID.

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

    When flying out of Portland you will be using Portland. You will be landing at St. Louis, also known as Lambert-St Louis.

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

    We unfortunately don’t have that data for this specific route.

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

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

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

    The two airlines most popular with KAYAK users for flights from Portland to St. Louis are Delta and United Airlines. With an average price for the route of $386 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $456 and an overall rating of 7.4.

  • 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.

Reviews of the top 3 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.
7.9
DeltaOverall score based on 8173 reviews
7.8Entertainment
8.5Crew
8.1Boarding
7.2Food
7.9Comfort
Airline reviews

The flight was great as well as the airline staff

10.0 ExcellentPatty, Feb 2026
TPA - ATL
Read more Delta reviews

The flight was great as well as the airline staff

First class and monitors weren’t working for mine & my husbands. Eventually fixed, but quite annoyed as we bought first class. Also, No foot rests.

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

It was delayed but other than that it was great.

Got on the plane and sat there for an hour before departure.

Second flight in a row where the entertainment system is broken. 5 hour long flight with no entertainment and flight attendants did not seem interested in resolving the matter. Very shocked to be treated this poorly considering I paid for a first class experience and have Diamond Medallion status.

They double booked seats, the gate staff changed my ticket as I was boarding she went over to the computer and changed it without telling me. She messed up an entire three row section for me and others. Other travelers were outraged but the gate staff were so rude, so condescending saying it wasn't their problem to solve. I would rate this a zero if I could. Will not fly Delta again I'll stick with United and American.

Comfort seating was on the tight side. Maybe it was a smaller plane(?)

I didn't take this flight. I changed the flight. Why am I getting surveys and notifications on flights that I change. Seems like a defect with Kayak.

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

I upgraded my seat and was promised it would be next to the emergency door for extra leg room and they said it was premium plus but it was at the back of the plane...same thing happened from Newark to Dubai

Everything except the food and entertainment. It was a great experience though

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

United Airlines is my preferred airlines and I am thankful for Gary who also help support me on the phone to switch my flight literally last min.

Not being stranded in Chicago for her airport to 11:30 tomorrow morning the 3rd

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

The attendant on board was amazing. She should be doing business/first international long haul.

I was fully checked in the prior night and i was unchecked and then didn’t have a seat when I boarded. Instead of an aisle seat, I was out in the middle seat of the very last row of the plane.

In overall it was a good experience, the only down point was that the entertainment screen was working properly.

The flight was significantly delayed for 6.5 hours because of snow. There was no communication once the plane returned to the gate regarding when the flight would resume. Other flights were departing while our flight was being unloaded for reasons unknown. Our flight also seemed out of the queue regarding further deicing, refueling, and waiting to Taxi to the runway.

Flight was on time and the meal and service were good.

Flight was delayed for 2 hours, then last minute the change to on time. The satélite location is far and a nightmare to get to.

This was a horrible experience. I’ve experienced several delays at this point and still not home. I was supposed to be home by 8:30 last night and here I sit at 7 am on a plane STILL unable to go home because of American Airlines.

Generally good. Flight left on time and the seats are comfortable. Plenty of space in front if you in you choose a comfort plus seat, completely worth spending the extra money given the amount of hours the flight lasts. The food tastes good but I would say it’s a the amount is too little. The crew was friendly and efficient. There was a some turbulence at different points into the flight. American Airlines has good deals to NZ if you book with plenty of time before you plan on going.

the plane was so hot!! the air-conditioning was barely blowing. The flight was delayed, and we had to sit on the hot plane before take off for an extended amount of time, waiting on international passengers. Would not have been so bad if it was not so hot. They said it would get better after take off, but it did not.

They are always late and seats was also not having working charger

We flew in first class. The crew did not offer drinks before the flight took off, but they treated us well during the flight. The food was excellent. There was actually too much food served, but it was nice to have all the options.

did not have enough meal for first class passengers so offer us snack

Arrived 40 min early which was great - sat in runway for 35 min so no gain. Then waited for luggage 45 min. They need to staff accordingly knowing its one of the busiest week in Phx

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

Information on your arrival and departure airports