Find flights
Deals
Insights
When to book
FAQs & Tips
Airlines

STL - PWM

$149 Find cheap flights from St. Louis to Portland, Maine

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Portland departing on 9/23. 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
0 bags
Sat 5/25
Sat 6/1

Search hundreds of travel sites at once for deals on flights to Portland

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Portland, 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 St. Louis to Portland, as well as popular online travel agencies
In the last 7 days travelers have searched 45,119,101 times on KAYAK, and here is why:

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from St. Louis to Portland (STL-PWM)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Portland 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 and deals for you by selecting your travel dates.
Choose your dates
9:20 pm - 9:02 amSTL-PWM
10h 42m1 stop
11:46 am - 7:02 amPWM-STL
20h 16m1 stop
$149Frontier
Find Deal
Mon, Sep 23 - Thu, Sep 26
9:20 pm - 9:02 amSTL-PWM
10h 42m1 stop
11:46 am - 7:02 amPWM-STL
20h 16m1 stop
$150Frontier
Find Deal
Mon, Sep 23 - Thu, Sep 26
6:58 pm - 12:42 amSTL-PWM
4h 44m1 stop
5:13 pm - 11:20 pmPWM-STL
7h 07m1 stop
$273American Airlines
Find Deal
Wed, Sep 4 - Wed, Sep 11
5:37 am - 11:24 amSTL-PWM
4h 47m1 stop
8:00 am - 11:50 amPWM-STL
4h 50m1 stop
$274American Airlines
Find Deal
Tue, Sep 10 - Tue, Sep 17
6:45 am - 12:08 pmSTL-PWM
4h 23m1 stop
6:05 am - 10:47 amPWM-STL
5h 42m1 stop
$276Delta
Find Deal
Wed, Sep 4 - Sat, Sep 7
6:12 pm - 11:44 pmSTL-PWM
4h 32m1 stop
6:05 am - 11:48 amPWM-STL
6h 43m1 stop
$316Delta
Find Deal
Tue, Jun 4 - Thu, Jun 6
6:55 pm - 10:09 amSTL-PWM
14h 14m1 stop
1:14 pm - 12:05 pmPWM-STL
23h 51m3 stops
Sun, Jun 9 - Sun, Jun 16
9:30 am - 11:59 pmSTL-PWM
13h 29m2 stops
3:55 pm - 10:56 pmPWM-STL
8h 01m1 stop
$446United Airlines
Find Deal
Wed, Sep 4 - Wed, Sep 11
6:55 pm - 10:09 amSTL-PWM
14h 14m1 stop
1:14 pm - 1:51 pmPWM-STL
25h 37m2 stops
Sun, Jun 9 - Sun, Jun 16
5:20 pm - 11:59 pmSTL-PWM
29h 39m2 stops
3:55 pm - 10:56 pmPWM-STL
8h 01m1 stop
$547United Airlines
Find Deal
Mon, Sep 16 - Mon, Sep 23

Flights from St. Louis to Portland - Travel Insights & Trends

Get data-powered insights and trends into flights from St. Louis to Portland 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 St. Louis to Portland?

The average price of all flights from St. Louis to Portland, Maine clicked on KAYAK for each day over the last 12 months.
For St. Louis to Portland, Wednesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Portland back to St. Louis, the best deals are generally found on Wednesday, with Saturday being the most expensive.

What is the cheapest month to fly from St. Louis to Portland, Maine?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from St. Louis to Portland, Maine, 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 St. Louis to Portland, Maine is February, where tickets cost $362 on average. On the other hand, the most expensive months are July and November, where the average cost of tickets is $535 and $532 respectively.

How far in advance should I book a flight from St. Louis to Portland, Maine?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from St. Louis to Portland, Maine, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from St. Louis to Portland, Maine, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 75 days before departure.

Good to know

Low season

February

High season

June

Cheapest flight

$149
Best time to beat the crowds with an average 22% drop in price.
Most popular time to fly with an average 8% increase in price.
Flight from St. Louis to Portland

When to book flights from St. Louis to Portland

Are your dates flexible? Find out the best times to travel from St. Louis to Portland 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 St. Louis to Portland

  • What is the cheapest flight from St. Louis to Portland, Maine?

    In the last 3 days, the lowest price for a flight from St. Louis to Portland, Maine was $169 for a one-way ticket and $149 for a round-trip.

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

    No

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

    St. Louis and Portland are both served by 1 main airport. You will leave St. Louis from Lambert-St Louis and will be arriving at Portland.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from St. Louis to Portland are Delta and United Airlines. With an average price for the route of $476 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $560 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from St. Louis to Portland?

    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 St. Louis to Portland.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Portland?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Portland from St. Louis 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 St. Louis to Portland?

    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 Portland with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and PWM 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 St. Louis to Portland?

    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 Portland from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top 5 airlines serving from St. Louis to Portland

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Portland. 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 St. Louis to Portland? 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
DeltaOverall score based on 11004 reviews
8.2boarding
7.9comfort
8.6crew
7.5food
8.0entertainment
Airline reviews

I'm a larger, athletic guy (6'2", 260lbs powerlifter) and I found the seats incredibly uncomfortable with minimal leg room, especially in a window seat. Now, I full understand that being smaller may change my view but even if I was 80lbs less, my legs would be the same size and I was sandwiched between my seat and the seat in front of me.

6.0 GoodDan, Apr 2024LGA - DEN
Read more about Delta reviews

I'm a larger, athletic guy (6'2", 260lbs powerlifter) and I found the seats incredibly uncomfortable with minimal leg room, especially in a window seat. Now, I full understand that being smaller may change my view but even if I was 80lbs less, my legs would be the same size and I was sandwiched between my seat and the seat in front of me.

Horrible. This was not first class. This was a connecting flight whi h was late. My original flight never came. I hated the fact that delta gave me a connecting flight from New York to Orlando Florida. No meals and the television screens were not working. There wasn't even any power to charge your phones. This is NOT FIRST CLASS DELTA!!! Do better next time!

This flight was ridiculous. I had to have a connecting flight from New York to orlando Florida??? The flight left late and because it was a short flight there was no first class amenities. I had one alcohol drink. The flight crew was fine, but it sure did not feel like first class. Delta to me dropped the ball by giving me a connecting flight. By the time we got to Raleigh we would have missed the next flight. Lucky for me the flight never came so now I was stuck waiting for a later flight that came in late also.

Our flight was delayed in Atlanta. The staff could have gave us an explanation for the delay and how long it would be.

I liked the ease of checking in, luggage check in, wheel chair assistance, boarding and flight.

On my way home I had a layover. The flight from ATL to CLT was amended 5x while I was waiting. I could have driven home sooner. Overall from Dallas, Tx to Charlotte, NC I started my trip at 4:30pm, I didn’t get home until past midnight. I know things happen, but 5x to make me run back and forth in an airport from different terminals is excessive. I also upgraded to comfort + , I didn’t feel it was worth it. There was no benefit

On my way home I had a layover. The flight from ATL to CLT was amended 5x while I was waiting. I could have driven home sooner. Overall from Dallas, Tx to Charlotte, NC I started my trip at 4:30pm, I didn’t get home until past midnight. I know things happen, but 5x to make me run back and forth in an airport from different terminals is excessive.

They did a fine job. Can't wait to use Delta in the future.

There was a loud squeaky sound the whole time we were flying.

Had a broken tray in business class. Crew just shrugged it off.

Great. Loved that there was WiFi on flight to keep in touch and excellent service of beverages and snacks.

Business class is great. New airplane, very comfortable, better than some of the major airlines I am used to

Terrible. Flight was cancelled due to the weather in the east and sout east(florida). Did not get any compesation of any kind. According to them, it was not under their control so I lost all the money paid for the 2 fairs from Raleigh, NC to Orlando, Fl.

great flight. Pilot was communicative, flight attendants were excellent. Really nice experience except my tv didn’t work.

Overall, the flight was better than the flight I took to go to Florida, which had a bunch of problems. The crew is really nice and the plane was new so it had a small problem when we were on the runway, but the flight itself was great. They even made some time back up, which is always a good thing.

There were multiple delays but JetBlue tried to make the boarding and departure process as quick and efficient as possible. The crew was as detached from reality as could be, meaning: not very friendly and just doing things by the numbers.

I had back trouble prior to my flight and everyone was great about helping me.

40 minute delay before take off after boarding flight. Bright lights throughout night flight due Issues with light panels. In flight Entertainment nonfunctional

Everything was good except for deplaning in NY. Took way too long!!

Jet Blue keeps getting iit wrong. 4 hour mechanical delay followed by terrible boarding experience. This is my third horrific jet blue flight in 2024. I am going to try to avoid this loser in the sky

Due to one crew member not showing up to work, our flight was significantly delayed causing us to miss our connecting flight in Houston to Mississippi causing us to be delayed by more than 6 hours and missing our event all together. Very disappointing. All because ONE crew member called in sick. United did grant us a $15 meal voucher, which was a small but appreciated concession that I wasn’t able to use because I ordered my lunch and paid for it before applying the concession, and the staff said it was too late to use it. Ugh! We also had a TWO delay coming back from Mississippi, but that was on American Airlines and it was due to weather, so not their fault. Anyway, not at all impressed with United’s handling of our flight and the HUGE disappointment of missing our important family event for our 90 year old mother. All that money and all that stress and emotions for nothing. Having to wait the hour to bring an employee from LAX seemed like something that should not have happened. Why don’t you have a local back-up? Santa Ana is not a little airport in a rural area.

Flight delayed from Cape Town to Washington then got diverted to miami and in miami we had to fend for ourselves , im still trying to get to Shreveport now

delay several times and wait extra long to board. no entertainment service because there are problem for some rows. always encounter some delays for the last flight of the day.

I just wrote a text which was supposed to be for the flight from Denver to spokane not Frankfurt to Denver.

On time every leg of the journey and exceptional staff at counter, gate, and on board. I haven’t travelled in US for a long time and was genuinely surprised how pleasant this was.

The delays (5 hrs) were a comedy of errors, and the multiple safety issues encountered were very concerning.

flight delays, staff only communicating when pushed, food service lasting a grand total of 7 minutes, stuck in seat from 45mins into flight until landing

Crew was great and did their best to make us comfortable and captain came out at the beginning to announce why the flight was delayed, weather situation up ahead, and kept us updated throughout the flight.

they made me check my carryon. There was space in the overhead bins.

Nice flight, nice crew but no cookie or napkin with my seltzer.

This flight is frequently delayed. The connections seemingly are more frequently delayed. I’ve missed connections as a result twice on the same route to charlotte then Charleston. Final destination arrival has been the next day, twice in a row. No pilots, no crew. Too many excuses. Unfortunately, my days with American are over.

Entertainment was okay not because anything was wrong but it is a short flight so having no wifi is annoying but understandable. Crew was outstanding as usual

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

The Flight attendant had an attitude and didn't allow anyone any time to prepare for landing despite being absent throughout the entire trip

Flight boarded without pilots. Sat on plane for 3 hrs. after over an hour late boarding. Plane never took off. Had to deplane near midnight. Line for rebooking was 3 hours + long. I had to leave.

The flight was great but board was a nightmare. The gate was changed 4 times during the layover period

The experience was great and much better than the flight going out. of course I was in first class but the service was excellent

Cold air blew constantly on my legs almost making me numb.

Missed the flight because of them and up geting a rental car

Delayd flight out of atl as always miss my conection in dfw no flight untill next day

I purchased a carry on bag online…was supposed to cost $72 but after a whole slew of bs charges, the total was over $175.00. Because of these hidden charges, I will not even consider flying Frontier ever again. It’s just not worth the hassle. I’m scratching this company off my list forever.

Flight was OK. Seats were good no cell phone charges on the plane no TVs or entertainment.

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

Flight cancelled and was told by a rude gate agent that they don’t accommodate on other airlines. Had to wait 5 hours for a connecting flight that had a 7 hour layover. Would not allow bags to be checked early so we couldn’t go through security .Had to rent a car for the afternoon to store bags and get a meal. Also incurred a hotel fee. No apology or reason given for the cancellation- just rudeness.

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

The process of buying the ticket and navigating all the hidden charges that Frontier throws at you was a terrible experience. The actual airport experience and flying was fine.

The truck that was refueling the plane drove away with the hose still connected to the plane and ripped part of the plane off with it

Not have to pay for every single item to take a flight. Seating and delays sucked.

Flight was cancelled and I had to spend the night in the airport lugging my suitcase around

If you don’t check in 24 hours in advance, they will charge you $110 to check your bag instead of the $30. I did not get an email with this information and did not check in. In addition, my flight home was cancelled at layover and I had to spend the night in the airport, and then have another layover at another airport before making it home. Will not fly frontier again.

Book cheap flights from St. Louis to Portland

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Portland found on KAYAK in the last 72 hours.
5/23Thu
1 stop
12h 39mSTL-PWM
$169
6/2Sun
2 stops
18h 07mSTL-PWM
$199
6/6Thu
1 stop
12h 57mSTL-PWM
$218
5/23Thu
2 stops
13h 50mSTL-PWM
$222
6/2Sun
3 stops
22h 29mSTL-PWM
$224
6/6Thu
2 stops
20h 01mSTL-PWM
$253
6/6Thu
3 stops
25h 24mSTL-PWM
$274
5/23Thu
3 stops
24h 24mSTL-PWM
$294
6/2Sun
1 stopAmerican Airlines
5h 43mSTL-PWM
$328

Search by stops

Search by airline

Search by price

Last minute flights from St. Louis to Portland

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from St. Louis to Portland that are departing in the next 10 days.
4/28Sun
multi-stopDelta
4h 34mSTL-PWM
5/19Sun
multi-stopDelta
5h 19mPWM-STL
$726
4/30Tue
multi-stopDelta
4h 34mSTL-PWM
5/1Wed
multi-stopDelta
5h 20mPWM-STL
$747
4/28Sun
multi-stopAmerican Airlines
4h 38mSTL-PWM
5/7Tue
multi-stopAmerican Airlines
8h 09mPWM-STL
$828
4/28Sun
multi-stopAmerican Airlines
11h 47mSTL-PWM
5/19Sun
multi-stopAmerican Airlines
5h 26mPWM-STL
$965
4/28Sun
multi-stopAmerican Airlines
4h 38mSTL-PWM
5/7Tue
multi-stopAmerican Airlines
8h 11mPWM-STL
$979
4/30Tue
multi-stopAmerican Airlines
12h 33mSTL-PWM
5/1Wed
multi-stopAmerican Airlines
4h 56mPWM-STL
$985
4/30Tue
multi-stopAmerican Airlines
9h 44mSTL-PWM
5/1Wed
multi-stopAmerican Airlines
11h 00mPWM-STL
$1,236
4/28Sun
multi-stopAmerican Airlines
9h 43mSTL-PWM
5/19Sun
multi-stopAmerican Airlines
8h 07mPWM-STL
$1,352

Search by stops

Search by airline

Search by price

St. Louis - Portland Flights

Departure:

St. Louis (STL)United States

Destination:

Portland (PWM)United States

Return flight deals:

Portland - St. Louis

Cabin classes: