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Cheap flights from St. Louis to Portland from $115

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Portland departing on 10/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Portland

Cheap round-trip flights

Southwest Logo
6:05 am - 12:10 pmSTL-PWM
5h 05m1 stop
Southwest Logo
5:30 am - 12:35 pmPWM-STL
8h 05m2 stops
$214Southwest
Find Deal
mar., nov. 4 - mar., nov. 11
Southwest Logo
1:15 pm - 10:15 pmSTL-PWM
8h 00m2 stops
Southwest Logo
5:30 am - 1:50 pmPWM-STL
9h 20m2 stops
$220Southwest
Find Deal
mar., nov. 4 - mar., nov. 11
American Airlines Logo
6:00 am - 5:05 pmSTL-PWM
10h 05m1 stop
American Airlines Logo
6:00 am - 10:13 amPWM-STL
5h 13m1 stop
$226American Airlines
Find Deal
mar., nov. 4 - mar., nov. 11
American Airlines Logo
6:08 pm - 11:51 pmSTL-PWM
4h 43m1 stop
American Airlines Logo
6:00 am - 9:56 amPWM-STL
4h 56m1 stop
$229American Airlines
Find Deal
mié., oct. 8 - mié., oct. 15
Delta Logo
5:11 pm - 12:11 amSTL-PWM
6h 00m1 stop
Delta Logo
6:00 am - 10:26 amPWM-STL
5h 26m1 stop
$237Delta
Find Deal
mié., oct. 1 - mié., oct. 8
Delta Logo
3:36 pm - 12:11 amSTL-PWM
7h 35m1 stop
Delta Logo
5:42 am - 3:55 pmPWM-STL
11h 13m2 stops
$242Delta
Find Deal
mié., oct. 1 - mié., oct. 8
American Airlines Logo
6:00 am - 12:29 pmSTL-PWM
5h 29m1 stop
American Airlines Logo
5:20 pm - 9:10 pmPWM-STL
4h 50m1 stop
$246American Airlines
Find Deal
mar., sep. 30 - mar., sep. 30
Delta Logo
6:00 am - 12:22 pmSTL-PWM
5h 22m1 stop
Delta Logo
12:45 pm - 4:32 pmPWM-STL
4h 47m1 stop
$247Delta
Find Deal
jue., nov. 6 - sáb., nov. 8
United Airlines Logo
5:00 am - 1:53 pmSTL-PWM
7h 53m2 stops
United Airlines Logo
5:41 pm - 11:57 pmPWM-STL
7h 16m1 stop
$322United Airlines
Find Deal
mié., oct. 8 - mié., oct. 15
United Airlines Logo
6:00 am - 1:53 pmSTL-PWM
6h 53m1 stop
United Airlines Logo
7:25 pm - 12:28 pmPWM-STL
18h 03m2 stops
$352United Airlines
Find Deal
mar., sep. 30 - mar., sep. 30

American Airlines flights from St. Louis to Portland, Maine

Our best American Airlines deals on St. Louis to Portland, Maine flight tickets
American Airlines
Nov 4
STL6:00 amLambert-St Louis
10h 05m
1 stop
PWM5:05 pmPortland
Nov 11
PWM6:00 amPortland
5h 13m
1 stop
STL10:13 amLambert-St Louis
$226
Find similar
American Airlines
Oct 8
STL6:08 pmLambert-St Louis
4h 43m
1 stop
PWM11:51 pmPortland
Oct 15
PWM6:00 amPortland
4h 56m
1 stop
STL9:56 amLambert-St Louis
$229
Find similar
American Airlines
Sep 30
STL6:00 amLambert-St Louis
5h 29m
1 stop
PWM12:29 pmPortland
Sep 30
PWM5:20 pmPortland
4h 50m
1 stop
STL9:10 pmLambert-St Louis
$246
Find similar

Delta flights from St. Louis to Portland, Maine

Our best Delta deals on St. Louis to Portland, Maine flight tickets
Delta
Oct 1
STL5:11 pmLambert-St Louis
6h 00m
1 stop
PWM12:11 amPortland
Oct 8
PWM6:00 amPortland
5h 26m
1 stop
STL10:26 amLambert-St Louis
$237
Find similar
Delta
Oct 1
STL3:36 pmLambert-St Louis
7h 35m
1 stop
PWM12:11 amPortland
Oct 8
PWM5:42 amPortland
11h 13m
2 stops
STL3:55 pmLambert-St Louis
$242
Find similar
Delta
Nov 6
STL6:00 amLambert-St Louis
5h 22m
1 stop
PWM12:22 pmPortland
Nov 8
PWM12:45 pmPortland
4h 47m
1 stop
STL4:32 pmLambert-St Louis
$247
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Portland, Maine that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated septiembre 11, 2025.
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

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

mar. 11/4

6:05 am-12:10 pm

1 stop5h 05m

Portland

mar. 11/11

5:30 am-12:35 pm

2 stops8h 05m

$214

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

mar. 11/4

1:15 pm-10:15 pm

2 stops8h 00m

Portland

mar. 11/11

5:30 am-1:50 pm

2 stops9h 20m

$220

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

mar. 11/4

6:00 am-5:05 pm

1 stop10h 05m

Portland

mar. 11/11

6:00 am-10:13 am

1 stop5h 13m

$226

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

mié. 10/8

6:08 pm-11:51 pm

1 stop4h 43m

Portland

mié. 10/15

6:00 am-9:56 am

1 stop4h 56m

$229

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

mié. 10/1

5:11 pm-12:11 am

1 stop6h 00m

Portland

mié. 10/8

6:00 am-10:26 am

1 stop5h 26m

$237

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

mié. 10/1

3:36 pm-12:11 am

1 stop7h 35m

Portland

mié. 10/8

5:42 am-3:55 pm

2 stops11h 13m

$242

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

mar. 9/30

6:00 am-12:29 pm

1 stop5h 29m

Portland

mar. 9/30

5:20 pm-9:10 pm

1 stop4h 50m

$246

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

jue. 11/6

6:00 am-12:22 pm

1 stop5h 22m

Portland

sáb. 11/8

12:45 pm-4:32 pm

1 stop4h 47m

$247

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

mié. 10/8

5:00 am-1:53 pm

2 stops7h 53m

Portland

mié. 10/15

5:41 pm-11:57 pm

1 stop7h 16m

$322

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

mar. 9/30

6:00 am-1:53 pm

1 stop6h 53m

Portland

mar. 9/30

7:25 pm-12:28 pm

2 stops18h 03m

$352

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 cheapest month to fly to Portland, Maine?

The cheapest month to fly to Portland, Maine from St. Louis is in November. Flight prices, which tend to average around $351, 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 November, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $366.

What is the cheapest day to depart on your flight to Portland, Maine?

On average, the least expensive day to fly to Portland, Maine from St. Louis is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $375. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Friday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $456.

What is the cheapest time of day to depart on your flight to Portland, Maine?

In the evening is the cheapest time of day to fly from St. Louis to Portland, Maine when you can find flight prices for as low as $285. Flying to Portland, Maine in the evening is an ideal time because this is during off-peak travel hours. Try not to purchase tickets at noon because they tend to be around $436. Of course, these prices can vary depending on the time of year and what airport you fly to.

How far in advance should I book a flight 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 $424 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 $362 on momondo.

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

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

Direct flights

None
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

  • 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 4h 12m.

  • 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
American AirlinesPriceFrom $284Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $300Free CancellationRating
7.9
7,960 reviews
Search Delta flights
SouthwestPriceFrom $308Free CancellationRating
8.0
4,248 reviews
Search Southwest flights
United AirlinesPriceFrom $336Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights

  • Southwest Flights From St. Louis to Portland, Maine

    Southwest operates around 2 flights from St. Louis to Portland, Maine every week. The average price of these flights found in the last 72 hours has been $462, but momondo users have found Southwest deals from St. Louis to Portland, Maine from as low as $308 round-trip. Southwest has been scored 8.0/10 in 4,248 reviews.

Traveling to a place near Portland?

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

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.

An easier way to manage your Portland, Maine trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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sáb. 10/11
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