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Cheap flights from St. Louis to Portland from $170

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Portland

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:20 pm - 9:08 amSTL  Lambert-St Louis-PWM Portland
13h 48m1 stop Orlando
Multiple Airlines Logo
7:12 pm - 10:53 amPWM  Portland-STL Lambert-St Louis
40h 41m2 stops Tampa Atlanta Hartsfield-Jackson
$286Multiple Airlines
Tue, Dec 8 - Wed, Dec 16
Multiple Airlines Logo
12:02 pm - 9:08 amSTL  Lambert-St Louis-PWM Portland
44h 06m2 stops Atlanta Hartsfield-Jackson Orlando
Multiple Airlines Logo
9:48 am - 12:12 amPWM  Portland-STL Lambert-St Louis
15h 24m1 stop Orlando
$292Multiple Airlines
Wed, Dec 9 - Wed, Dec 16
American Airlines Logo
5:02 am - 11:58 amSTL  Lambert-St Louis-PWM Portland
5h 56m1 stop Chicago O'Hare Intl
American Airlines Logo
12:44 pm - 6:49 pmPWM  Portland-STL Lambert-St Louis
7h 05m1 stop Chicago O'Hare Intl
$339American Airlines
Wed, Dec 9 - Wed, Dec 16
Delta Logo
2:33 pm - 11:33 pmSTL  Lambert-St Louis-PWM Portland
8h 00m1 stop Atlanta Hartsfield-Jackson
Delta Logo
4:53 pm - 8:32 pmPWM  Portland-STL Lambert-St Louis
4h 39m1 stop Detroit Metropolitan Wayne County
$339Delta
Sat, Dec 12 - Mon, Dec 14
Delta Logo
10:14 am - 4:11 pmSTL  Lambert-St Louis-PWM Portland
4h 57m1 stop Detroit Metropolitan Wayne County
Delta Logo
6:12 am - 11:51 amPWM  Portland-STL Lambert-St Louis
6h 39m1 stop New York LaGuardia
$339Delta
Tue, Dec 8 - Tue, Dec 15
United Airlines Logo
1:18 pm - 11:24 pmSTL  Lambert-St Louis-PWM Portland
9h 06m2 stops Chicago O'Hare Intl Newark
United Airlines Logo
4:47 pm - 9:23 pmPWM  Portland-STL Lambert-St Louis
5h 36m1 stop Chicago O'Hare Intl
$344United Airlines
Mon, Dec 14 - Wed, Dec 16
United Airlines Logo
3:25 pm - 9:29 pmSTL  Lambert-St Louis-PWM Portland
5h 04m1 stop Chicago O'Hare Intl
United Airlines Logo
6:00 am - 2:41 pmPWM  Portland-STL Lambert-St Louis
9h 41m2 stops Newark Chicago O'Hare Intl
$344United Airlines
Sat, Dec 5 - Tue, Dec 15
American Airlines Logo
6:02 am - 12:02 pmSTL  Lambert-St Louis-PWM Portland
5h 00m1 stop Chicago O'Hare Intl
American Airlines Logo
6:00 am - 12:25 pmPWM  Portland-STL Lambert-St Louis
7h 25m1 stop Philadelphia
$363American Airlines
Sat, Dec 5 - Tue, Dec 15
Southwest Logo
4:15 pm - 9:50 pmSTL  Lambert-St Louis-PWM Portland
4h 35m1 stop Baltimore/Washington
Southwest Logo
12:45 pm - 7:25 pmPWM  Portland-STL Lambert-St Louis
7h 40m2 stops Baltimore/Washington Pittsburgh
$368Southwest
Sat, Dec 5 - Tue, Dec 15
Southwest Logo
6:35 am - 2:45 pmSTL  Lambert-St Louis-PWM Portland
7h 10m1 stop Baltimore/Washington
Southwest Logo
12:45 pm - 6:05 pmPWM  Portland-STL Lambert-St Louis
6h 20m1 stop Baltimore/Washington
$378Southwest
Wed, Dec 2 - Thu, Dec 10

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American Airlines flights from St. Louis to Portland, Maine

Our best American Airlines deals on St. Louis to Portland, Maine flight tickets
American Airlines
Dec 3
STL5:02 amLambert-St Louis
6h 00m
1 stop
PWM12:02 pmPortland
Dec 15
PWM12:15 pmPortland
5h 32m
1 stop
STL4:47 pmLambert-St Louis
$393
American Airlines
Dec 5
STL11:25 amLambert-St Louis
10h 54m
2 stops
PWM11:19 pmPortland
Dec 15
PWM5:06 amPortland
6h 02m
1 stop
STL10:08 amLambert-St Louis
$425
American Airlines
Dec 23
STL4:46 pmLambert-St Louis
5h 13m
1 stop
PWM10:59 pmPortland
Dec 28
PWM5:30 amPortland
5h 49m
1 stop
STL10:19 amLambert-St Louis
$574

United Airlines flights from St. Louis to Portland, Maine

Our best United Airlines deals on St. Louis to Portland, Maine flight tickets
United Airlines
Dec 5
STL3:25 pmLambert-St Louis
5h 04m
1 stop
PWM9:29 pmPortland
Dec 15
PWM6:00 amPortland
9h 41m
2 stops
STL2:41 pmLambert-St Louis
$344
United Airlines
Dec 5
STL3:25 pmLambert-St Louis
5h 04m
1 stop
PWM9:29 pmPortland
Dec 15
PWM6:00 amPortland
9h 41m
2 stops
STL2:41 pmLambert-St Louis
$368
United Airlines
Dec 12
STL9:40 amLambert-St Louis
4h 58m
1 stop
PWM3:38 pmPortland
Dec 16
PWM9:12 amPortland
8h 12m
1 stop
STL4:24 pmLambert-St Louis
$449

momondo Fare Finder

 
Use the filters below to find and compare flights from St. Louis to Portland, Maine that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Tue 12/8

6:20 pm-9:08 am

1 stop13h 48m

Portland

Wed 12/16

7:12 pm-10:53 am

2 stops40h 41m

$286

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Wed 12/9

12:02 pm-9:08 am

2 stops44h 06m

Portland

Wed 12/16

9:48 am-12:12 am

1 stop15h 24m

$292

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Wed 12/9

5:02 am-11:58 am

1 stop5h 56m

Portland

Wed 12/16

12:44 pm-6:49 pm

1 stop7h 05m

$339

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Sat 12/12

2:33 pm-11:33 pm

1 stop8h 00m

Portland

Mon 12/14

4:53 pm-8:32 pm

1 stop4h 39m

$339
Quickest round-trip

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Tue 12/8

10:14 am-4:11 pm

1 stop4h 57m

Portland

Tue 12/15

6:12 am-11:51 am

1 stop6h 39m

$339

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Mon 12/14

1:18 pm-11:24 pm

2 stops9h 06m

Portland

Wed 12/16

4:47 pm-9:23 pm

1 stop5h 36m

$344

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Sat 12/5

3:25 pm-9:29 pm

1 stop5h 04m

Portland

Tue 12/15

6:00 am-2:41 pm

2 stops9h 41m

$344

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Sat 12/5

6:02 am-12:02 pm

1 stop5h 00m

Portland

Tue 12/15

6:00 am-12:25 pm

1 stop7h 25m

$363

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Sat 12/5

4:15 pm-9:50 pm

1 stop4h 35m

Portland

Tue 12/15

12:45 pm-7:25 pm

2 stops7h 40m

$368

St. LouisPortland

STL Lambert-St Louis - PWM Portland

STLPWM

Lambert-St Louis

Wed 12/2

6:35 am-2:45 pm

1 stop7h 10m

Portland

Thu 12/10

12:45 pm-6:05 pm

1 stop6h 20m

$378

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Portland from

How to get the cheapest flight ticket from St. Louis to Portland, Maine

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Portland, Maine?

Prices are currently low for flights on this route.

Typical prices usually range from $368 to $476.
The lowest price recently found on this route was $286.

What is the cheapest month to fly to Portland, Maine?

The cheapest month to fly to Portland, Maine from St. Louis is in December. Flight prices, which tend to average around $294, are often lower during this time because this is during the off-season. If you aren’t able to travel to Portland, Maine during the month of December, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $349.

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

You are more likely to see cheaper flights to Portland, Maine from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Portland, Maine for around $431 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portland, Maine from St. Louis for as low as $363 on momondo.

Can stopping save me money on St. Louis to Portland, Maine flights?

You could potentially save up to 18% on your flight if you consider stops on a St. Louis to Portland, Maine flight.

How have St. Louis to Portland, Maine flight prices changed over time?

As of November 2026, prices for St. Louis to Portland, Maine flights are approximately 66% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Portland, Maine

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Portland, Maine according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Portland, Maine (STL to PWM) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Portland, Maine

Best Price Found

$170

Fastest flight time

5h 20m

Direct flights

None
The best one-way flight to Portland, Maine from St. Louis in the past 72 hours is $170. The best round-trip flight deal from St. Louis to Portland, Maine found on momondo in the last 72 hours is $286.
The fastest flight from St. Louis to Portland, Maine takes 5h 20m
There are no direct flights from St. Louis to Portland, Maine. There are no popular flight routes from St. Louis to Portland, Maine.
Search flight deals

Frequently asked questions about flying from St. Louis to Portland, Maine

  • How far is Lambert-St Louis to Portland by plane?

    Portland is 1090.4 mi away from Lambert-St Louis. In terms of flight time, this usually takes a little over 5h 20m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Portland Airport?

    Prices for flights from Lambert-St Louis Airport to Portland Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Portland Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Portland Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Portland Airport.

  • What documentation or ID do you need to fly to Portland Airport?

    The travel and health documents you'll need for your trip to Portland Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Portland Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Portland, Maine?

Best airlines flying from St. Louis to Portland, Maine

Compare and see reviews for airlines that fly from St. Louis to Portland, Maine with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $294Free CancellationRating
7.8
8,702 reviews
Search Delta flights
American AirlinesPriceFrom $298Free CancellationRating
7.0
12,233 reviews
Search American Airlines flights
United AirlinesPriceFrom $327Free CancellationRating
7.3
10,474 reviews
Search United Airlines flights
SouthwestPriceFrom $358Free CancellationRating
8.0
4,214 reviews
Search Southwest flights

Traveling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
North Conway
Jackson
Boothbay Harbor
Brunswick
Lewiston
Freeport
Conway
Gorham
Auburn
Bartlett
Bath
Windham
Intervale
Georgetown
Oxford
Falmouth
Tamworth

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Portland?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Portland. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Portland with flexible booking policies on momondo?

All flight searches from St. Louis to Portland on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Portland?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Portland.

I’m not ready to book a flight from St. Louis to Portland right now. Can momondo alert me if prices change?

Price alerts on flights to Portland from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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