PWM - STL

$167 Find Cheap Flights from Portland to St. Louis - Compare and Save

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 7/28. 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
Travelers love KAYAK
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Everything you should know

Cheapest round-trip
$366
Typical prices: $436-$682
Delta
Wed 7/22Sat 7/25
PWM - STL • 1 stop
Cheapest one-way
$167
Typical prices: $223-$331
United Airlines
Tue 7/28
PWM - STL • 1 stop
Top airlines
Cheapest • from $366 (round-trip)
Best reviews • 7.9 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 $418 (round-trip)
Shortest trip • 5h 07m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 30% 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

Wed, Jul 22 - Sat, Jul 25
Delta Logo
11:01 am - 3:43 pm
PWM
-
STL
5h 42m
1 stop
Delta Logo
3:39 pm - 11:14 pm
STL
-
PWM
6h 35m
1 stop
$366Delta
Fri, Jul 31 - Tue, Aug 4
Multiple Airlines Logo
7:00 am - 8:57 am
PWM
-
STL
26h 57m
2 stops
Multiple Airlines Logo
4:09 pm - 10:27 am
STL
-
PWM
17h 18m
1 stop
$369Multiple Airlines
Sat, Jul 25 - Sat, Aug 1
United Airlines Logo
6:00 am - 12:11 pm
PWM
-
STL
7h 11m
1 stop
United Airlines Logo
4:53 pm - 11:30 pm
STL
-
PWM
5h 37m
1 stop
$374United Airlines
Thu, Aug 27 - Mon, Aug 31
American Airlines Logo
9:08 am - 4:23 pm
PWM
-
STL
8h 15m
1 stop
American Airlines Logo
5:57 pm - 11:59 pm
STL
-
PWM
5h 02m
1 stop
$375American Airlines
Sat, Jul 25 - Sat, Aug 1
United Airlines Logo
5:15 am - 12:11 pm
PWM
-
STL
7h 56m
2 stops
United Airlines Logo
4:53 pm - 11:30 pm
STL
-
PWM
5h 37m
1 stop
$377United Airlines
Tue, Jul 28 - Sun, Aug 2
Delta Logo
6:25 am - 11:47 am
PWM
-
STL
6h 22m
1 stop
Delta Logo
9:24 am - 5:54 pm
STL
-
PWM
7h 30m
1 stop
$380Delta
Thu, Aug 27 - Mon, Aug 31
Southwest Logo
5:55 am - 2:05 pm
PWM
-
STL
9h 10m
2 stops
Southwest Logo
12:15 pm - 10:25 pm
STL
-
PWM
9h 10m
2 stops
$385Southwest
Thu, Aug 6 - Sun, Aug 9
United Airlines Logo
6:00 am - 12:11 pm
PWM
-
STL
7h 11m
1 stop
United Airlines Logo
6:01 am - 1:25 pm
STL
-
PWM
6h 24m
1 stop
$401United Airlines
Wed, Jul 22 - Sat, Jul 25
American Airlines Logo
5:18 pm - 9:21 pm
PWM
-
STL
5h 03m
1 stop
American Airlines Logo
1:20 pm - 11:34 pm
STL
-
PWM
9h 14m
1 stop
$403American Airlines
Thu, Aug 6 - Sun, Aug 9
United Airlines Logo
5:15 am - 12:11 pm
PWM
-
STL
7h 56m
2 stops
United Airlines Logo
6:01 am - 1:25 pm
STL
-
PWM
6h 24m
1 stop
$406United 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.

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 July.

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 June and April, where the average cost of round-trip tickets is $662 and $568 respectively.

Good to know

Low seasonFebruary
Cheapest flight$167
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly with an average 39% 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 5 days, the lowest price for a flight from Portland to St. Louis was $167 for a one-way ticket and $366 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 $549 and an overall rating of 7.9, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $396 and an overall rating of 7.8.

  • 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
SouthwestOverall score based on 4246 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.

I have not flown Southwest in awhile and had a very pleasant experience. From ticketing to boarding to the flight. The flight left on time and landed ahead of schedule. It won't be so long next time!!

Everything went smoothly and we even arrived a little bit early.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

Southwest's seats are the least comfortable I have ever sat in.

For my birthday trip this was my second time ever flying, this trip was the best.

Crew was great flight was great baggage claim was a failure. It took over 1 hour for bags to arrive. Poor communication poor effort when I spoke to the supervisor about the delay

Everything was great except the food. The pretzels are really crappy.

I had a front row middle. I am not a big person and I barely fit in between that seat! No place to put my arms, even though the guys on each side were not taking over the arm rests. It felt like a frontier flight (if that tells you everything )

Overall is was a pretty good flight. However we were 15 mins late taking off and no one told us anything. We were all in our seats just sitting there for 15mins and all the sudden the pilot stayed we are leaving now. I think they should have at least said something after our take off time passed. Everyone was wondering what was going on. I will say the pilot did increase the speed of the plane so we arrived in time. So we weren't late.

It was as good as it could be. Flying is not a pleasant experience these days.

The plane was old and thus the seats were not good. No cushion left whatsoever, and it all was a bit worn out.

We departed early and made up time in the air allowing us to arrive 30 minutes early. Capt was incredibly genuine and thanked every passenger for flying with Delta. Completely humble and professional!

The boarding process needs to be refined. Sometimes the gate crew calls out the zones and then flip to showing the.zones boarding on the gate monitor display. So, unless you are huddled around the gate lanes watching the monitor, you could miss your boarding zone. Suggest the zones be announced each time a new zone is allowed to board.

This route with Delta always has delays or is cancelled. Aircrafts seem smaller and older. I fly Delta quite a bit - haven’t had issues with the international flights. But this route has always been the troublesome one

On 2 different flights the wifi was horrible and there was no drink or snack service.

Delta did an awful job w logistics at DTW. Missed connection. We were there an hour early. SUCKED

There was no FREE wi-fi nor entertainment screens at all.

Great, on time departure, friendly and accommodating crew, great leg room, Smith flight

As we lined up to board they gave our plane to a flight going to Newark. So then we got delayed until they could find another plane. Flight crew was ok. I’m assuming since it’s a shorter flight they only offered water and coffee.

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.

Small plane, poor meal choices for first class, bad terminal and boarding experience at LAX

Boarding delayed 20 minutes for no reason, no wifi, in flight entertainment, or snacks / waters?

This flight captain and crew were amazing, started ahead of time of departure and reached 30 mins before arrival time. Amazing!

Improvements in communication and empathy are absolutely necessary for American Airlines staff (top down). It’s like they are numb to the needs of their customers.

I like the speed of boarding and deplaning and the fact that everything was on time. The crew (attendants) were probably quite new and did not begin the in cabin service until 30 min before landing even though there was little to no air turbulence for the last 1.5 hours of the flight. It made for a mad scramble at the end to get trash collected and carts stowed before touch down.

The flights was delayed by hours and it was the firmest landing I have experienced in my life. My back is still sore.

I did like the employee's, they are very friendly and all smiled most of the time, Overall, from checking in bags to getting on plane, not enough employees to be able to get all on the plane, therefore I was not able to get on the plane, due to no one wea there for me to check in my bag, so I decided to go thru the security point and by the time they were done with my bags, I was told that my bag cannot be checked in, and then found out that the lady that does the check in was boarding the customers onto the plane, she said that she was going back and fourth, there for was not able to get on the plane, which changed all my flights by the time I got to Dallas, I was on standby 3 times, and wasn't sure about being able to get on the fourth plane, so ended up buying another plane ticket, so I could make my destination on time.

Not sure about entertainment as I didn't use any, so maybe there should be an NA option on this survey. Otherwise everything was just as it should be. Of course I wish planes were more comfortable and had seats that would tilt back further.

American Airlines “Randy” questioned why I needed preboarding and denied my request for same. Then Randy attempted to berate me when I boarded with my group. I was seated in an exit roll with a young man with a disability that exhibited difficulty controlling and settling himself. But Tandy questioned my disability. The flight was horrible. It was overpacked.

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

Information on your arrival and departure airports