Cheap flights from St. Louis to Portland (STL - PWM) from $102

This is the cheapest one-way flight price, found on 9/20. Prices may vary by date and flight preferences.
STL — PWM
Sep 26 — Oct 31

The best prices from Lambert-St Louis to Portland are usually found in February or April, booked 39 days in advance, depart on a Tuesday or Friday and return on a Tuesday

How to find the cheapest flight from St. Louis (STL) to Portland (PWM)

All the information you need to plan the best STL to PWM flight in 2023: compare St. Louis to Portland flight prices with the expected peak season, weather and rainfall in Portland.

Popular in

July

Cheapest in

February

Average price

$429

Round-trip from

$313
High demand for flights, 17% potential price rise
Best time to find cheap flights, 22% potential price drop
Average for round-trip flights in September 2023
From Lambert-St Louis to Portland

STL - PWM

Price

$313 - $537

PWM

Temperature

23 - 68 °F

PWM

Rainfall

2.9 - 4.5 inches

What is the cheapest day to fly round-trip from St. Louis to Portland, Maine?

Users have found that flying from St. Louis to Portland, Maine on a Sunday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

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

Users have found that booking a flight from St. Louis to Portland, Maine at least 39 days early can save you up to 32% on average compared to booking a flight this week. If booking 39 days before your flight isn’t an option for you, users have found flights from St. Louis to Portland, Maine for as little as $598 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $629 for flights departing within the next 3 days.

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

Due to multiple factors, expect to potentially pay more when booking in July. For low rates, February can be a great choice for travel to Portland, Maine. Flights to Portland, Maine from St. Louis in February are about $463 on average during February, but can be found for as low as $213.

When is the cheapest time to fly from St. Louis to Portland, Maine (STL - PWM)?

When flying from St. Louis to Portland, Maine, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 16% versus a flight in the afternoon.

Cheap Frontier flights from St. Louis to Portland

Find some of the cheapest Frontier flights traveling from St. Louis to Portland. Make sure to double check the flight details before booking.

Cheap American Airlines flights from St. Louis to Portland

To aid your search, here are some of the cheapest American Airlines flights we've found from St. Louis to Portland. Deals frequently update to provide users with more options.

Cheap St. Louis to Portland flights in September & October 2023

The best prices found for STL to PWM flights for September, October
Check out some of the best flight deals from St. Louis to Portland in 2023. Check back regularly for other flight deals.

St. Louis to Portland 2023 flight deals

Cheap flights to Portland from St. Louis found for this year
Check out some of the best flight deals from St. Louis to Portland in 2023. Check back regularly for other flight deals.

St. Louis to Portland flights leaving soon

Late deals on return flights to Portland from St. Louis, departing today and this week
Book one of these great deals on flights from St. Louis to Portland. It's wise to confirm all flight details are correct before booking.

One-way flights to Portland from St. Louis

The cheapest one-way flights from St. Louis to Portland
Some of the best available deals we've found on one-way flights from St. Louis to Portland. Users can also find round-trip St. Louis to Portland flights by using the search form above.

Find flights from St. Louis to Portland within your budget

Use the slider to find flights from St. Louis to Portland that fit your budget.

Fly from

Any airport

Fly to

Any airport

Budget

$189 - $460

Route

Depart

Return

Price

Lambert-St LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Mon 10/23

2 stops16h 36m

Portland

Sat 10/28

1 stop11h 29m

Lambert-St LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 10/19

1 stop12h 06m

Portland

Wed 10/25

1 stop13h 39m

Lambert-St LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 10/19

1 stop12h 06m

Portland

Sat 10/28

1 stop11h 29m

Lambert-St LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Fri 10/20

1 stop15h 34m

Portland

Sat 10/28

1 stop27h 58m

Lambert-St LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Fri 10/20

1 stop15h 34m

Portland

Fri 10/27

1 stop27h 59m

Lambert-St LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 10/19

1 stop13h 59m

Portland

Thu 10/26

1 stop29h 18m

Lambert-St LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Tue 10/24

1 stop5h 03m

Portland

Tue 10/31

1 stop7h 00m

Lambert-St LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Tue 10/17

1 stop15h 28m

Portland

Tue 10/24

1 stop5h 59m

Lambert-St LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Tue 10/24

1 stop6h 22m

Portland

Tue 10/31

2 stops10h 40m

Flights are sorted by cheapest first

Deals found on 9/20

Reviews of airlines servicing Portland

Read reviews from past customers who have flown Frontier, American Airlines and Delta from St. Louis to Portland. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
3,016 reviews

Crew

8.5

Entertainment

7.8

Overall

7.9

Boarding

8.0

Comfort

7.9

Food

7.2

Reviews

1 / 10

The flight was comfortable and the crew were attentive. The snacks and drinks were great. The boarding process was smooth. The pilot greeted us upon exit. Our luggage arrived promptly.

Delta
7.9
Good
3,016 reviews
Delta
7.9
Good
3,016 reviews

Crew

8.5

Entertainment

7.8

Overall

7.9

Boarding

8.0

Comfort

7.9

Food

7.2

Reviews

1 / 10

The flight was comfortable and the crew were attentive. The snacks and drinks were great. The boarding process was smooth. The pilot greeted us upon exit. Our luggage arrived promptly.

United Airlines
7.4
Good
1,887 reviews
Delta
7.9
Good
3,016 reviews

Crew

8.5

Entertainment

7.8

Overall

7.9

Boarding

8.0

Comfort

7.9

Food

7.2

Reviews

1 / 10

The flight was comfortable and the crew were attentive. The snacks and drinks were great. The boarding process was smooth. The pilot greeted us upon exit. Our luggage arrived promptly.

American Airlines
7.2
Good
2,635 reviews
Delta
7.9
Good
3,016 reviews

Crew

8.5

Entertainment

7.8

Overall

7.9

Boarding

8.0

Comfort

7.9

Food

7.2

Reviews

1 / 10

The flight was comfortable and the crew were attentive. The snacks and drinks were great. The boarding process was smooth. The pilot greeted us upon exit. Our luggage arrived promptly.

Frontier
5.8
Fair
762 reviews
Delta
7.9
Good
3,016 reviews

Crew

8.5

Entertainment

7.8

Overall

7.9

Boarding

8.0

Comfort

7.9

Food

7.2

Reviews

1 / 10

The flight was comfortable and the crew were attentive. The snacks and drinks were great. The boarding process was smooth. The pilot greeted us upon exit. Our luggage arrived promptly.

Related info for your journey

Useful info, stats and facts about St. Louis to Portland flights.

Can I find flights from St. Louis to Portland, Maine for under $200 on Cheapflights?

Yes, there are multiple flights from St. Louis to Portland, Maine for under $200. The cheapest flight booked recently is on Multiple Airlines for just $189, but on average you can expect to pay $270.

Are there last-minute flights available from St. Louis to Portland, Maine for under $300?

There are currently 12+ open flights from St. Louis to Portland, Maine within the next 7 days for less than $300.

What are the cheapest airlines flying from St. Louis to Portland, Maine round-trip?

According to our current data, Frontier ($245), American Airlines ($344), and Delta ($361) offers the cheapest pricing from St. Louis to Portland, Maine. These flights start at 47% lower than the current average price 3 months from now.

What are the cheapest airlines to fly from St. Louis to Portland, Maine one-way?

$105 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and United Airlines, with prices starting from $194 and $277, respectively.

What are the most popular airlines that fly from St. Louis to Portland, Maine?

What does STL to PWM mean?

Lambert-St Louis Airport is STL and Portland Airport is PWM. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.

Top 4 airlines flying from St. Louis to Portland

The chart below displays the airlines Cheapflights users traveling from St. Louis to Portland choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$331Average$481FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$345Average$484FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$365Average$480FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
JetBlueCheapest$464Average$484FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.