PWM - STL

$130 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 4/21. 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
$259
Typical prices: $686-$381
Delta
Tue 5/12Wed 5/13
PWM - STL • 1 stop
Cheapest one-way
$130
Typical prices: $167-$298
Delta
Tue 4/21
PWM - STL • 1 stop
Top airlines
Cheapest • from $259 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Portland and St. Louis. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $243 (round-trip)
Shortest trip • 5h 00m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 25% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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

Tue, May 12 - Wed, May 13
Delta Logo
4:48 pm - 9:09 pm
PWM
-
STL
5h 21m
1 stop
Delta Logo
6:45 am - 12:00 pm
STL
-
PWM
4h 15m
1 stop
$259Delta
Thu, May 7 - Wed, May 13
Delta Logo
6:02 am - 12:23 pm
PWM
-
STL
7h 21m
1 stop
Delta Logo
4:25 pm - 12:43 am
STL
-
PWM
7h 18m
1 stop
$285Delta
Thu, May 7 - Wed, May 13
American Airlines Logo
7:05 am - 11:47 am
PWM
-
STL
5h 42m
1 stop
American Airlines Logo
5:21 pm - 11:22 pm
STL
-
PWM
5h 01m
1 stop
$288American Airlines
Thu, May 7 - Wed, May 13
American Airlines Logo
7:05 am - 11:47 am
PWM
-
STL
5h 42m
1 stop
American Airlines Logo
5:21 pm - 11:22 pm
STL
-
PWM
5h 01m
1 stop
$294American Airlines
Mon, May 11 - Wed, May 13
Delta Logo
4:48 pm - 9:09 pm
PWM
-
STL
5h 21m
1 stop
Delta Logo
4:25 pm - 12:43 am
STL
-
PWM
7h 18m
1 stop
$311Delta
Wed, Apr 15 - Mon, Apr 20
Delta Logo
4:43 pm - 8:44 pm
PWM
-
STL
5h 01m
1 stop
Delta Logo
5:27 pm - 11:24 pm
STL
-
PWM
4h 57m
1 stop
$329Delta
Thu, May 7 - Wed, May 13
Delta Logo
11:03 am - 3:40 pm
PWM
-
STL
5h 37m
1 stop
Delta Logo
4:25 pm - 12:43 am
STL
-
PWM
7h 18m
1 stop
$331Delta
Sat, May 16 - Sat, May 23
United Airlines Logo
4:50 pm - 9:13 pm
PWM
-
STL
5h 23m
1 stop
United Airlines Logo
1:13 pm - 9:51 pm
STL
-
PWM
7h 38m
1 stop
$333United Airlines
Fri, May 29 - Mon, Jun 1
United Airlines Logo
4:51 pm - 9:16 pm
PWM
-
STL
5h 25m
1 stop
United Airlines Logo
1:13 pm - 9:51 pm
STL
-
PWM
7h 38m
1 stop
$337United Airlines
Mon, Jun 1 - Thu, Jun 4
Southwest Logo
5:30 am - 10:50 am
PWM
-
STL
6h 20m
1 stop
Southwest Logo
2:25 pm - 12:05 am
STL
-
PWM
8h 40m
2 stops
$338Southwest
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, Maine 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, Maine to St. Louis departing in May.

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 February, where the average cost of round-trip tickets is $577 and $534 respectively.

Good to know

Low seasonFebruary
Cheapest flight$130
Best time to beat the crowds but there is an average 20% increase in price.
Most popular time to fly with an average 18% 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 $130 for a one-way ticket and $259 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?

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

  • 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 $499 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 $386 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.

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.
8.0
SouthwestOverall score based on 4333 reviews
7.5Entertainment
7.0Food
8.1Boarding
8.6Crew
8.0Comfort
Airline reviews

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

2.0 MediocreStuart, Mar 2026
HOU - STL
Read more Southwest reviews

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

Southwest continues to do less for more money. Flight attendants used to be fun and friendly. But now it’s like they don’t even see you. Such a shame.

Great flight. Good snacks and drinks. Grateful it was free. The flight from Nashville to louisville, i think her name was Tracy (not sure that's right) super awesome, nice and cheerful. She really enjoyed being at work today! She was the person who scanned the boarding pass on flight wn941. She should be recommended for a raise !

I liked it better when you were truer to your roots Am paying more for less fun

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

Boarding was easy. The seats are small and fairly uncomfortable

I was supposed to be on a later flight. When I showed up at the gate, the woman working there was extremely helpful getting moved up to this earlier flight.

We had a 5 hour delay on the tarmac in Baltimore

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

Delta is always a wonderful experience. A clean plane and the crew is really friendly.

Too many people are taking up space in the overhead bins with their extra piece of luggage. Since they cannot fit their backpacks or extra luggage piece under the seat in front of them, they store it in the overheads and thus taking up room for other passengers. It wasn’t only one or two persons; more like 12 or 13 passengers.

This was the worse experience. They delayed our flight twice and we still had to find another flight to get home sooner which was alos delayed. Also, the flight attendant named Ginny on DL9890 leaving at 4:13pm on 3/23/26 was extremely rude.

I love Delta the flight attendants were personable and the flight arrived 1/2 earlier thanks expected. All a plus. The gate agent was a bit flustered but even with that I still had a good experience. Her supervisor assisted me.

Got to fly my favorite plane, the Boeing 767-400ER, to Milan. The soft blush pink mood lighting during meal service was very beautiful and gorgeous. The service was top-notch, and our flights were on time. I highly recommend Delta.

I am still at the Airport! Delayed Delayed and Delyaed

I took seat 15A in anticipation of window seat, there is no window.

The first class flight attendant was awful to everyone. Very rude; no customer service. She should not be working in first class.

Snacks and included beverages were appreciated. Boarding went smoothly. Plenty of overhead bin space. Seats get very uncomfortable after a couple of hours. After waiting 10 painful minutes for my walker, a very nice Delta guest agent pushed me in a wheelchair to the gate. It was finally delivered to me after another 15 minutes . Our checked bag was on the carousel long b4 I was able to retrieve it. Fortunately it was still there but somewhere along the way the straps we used to secure it were removed and and were not reattached. Wish I had made note of the agents name.

It was fine. 55 minute flight. No snacks or beverage service offered. Boarding went smoothly and my walker was waiting for me on the jet way.

The flight changed gates multiple times and flight had to be delayed multiple times

We called Kayak for a change due to the TSA situation in Atlanta. What we got was a canceled return flight (in error) and we had to find the mistake. Not happy with Kayak who blamed it on AA.

I was in last row so that is never great bc the person in front of me leaned his seat all the way back into me.

Delayed for mechanical and no updates on what was happening and how long the delay might be.

My flight from LGA was cancelled and my rebooked flight from JFK was delayed numerous times. I will now be getting home after 2am.

Flight was delayed half hour before boarding, but when I checked flight aware the plane that would Pick us up had a delay of more than an hour. AA should let us know in advance to avoid waiting several hours in the airport

On the return flight, arriving in Denver we sat on the tarmac in Denver for over 20 minutes.

Typical AA - late by 90+ mn. Gate changed twice... Changed the departure time 6 times No explanation, no communication on reasons for delay I travel with AA twice a year... and it is consistently very poor.. I will continue to use AA only when i have to.

The flight attendant in business class was excellent! Professional, friendly and attentive.

Delays with no explanation. It could have been handled better.

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

Information on your arrival and departure airports