What’s the cheapest layover airport for flights from St. Louis to Portland, Maine?

Baltimore (BWI) is the most affordable 1-stop option, with an average round-trip price of $295.

What’s the fastest layover option from St. Louis to Portland, Maine?

Flights via Newark (EWR) have the shortest average one-way travel time for 1-stop routes: 4h 49m.

What’s the top layover airport for flights from St. Louis to Portland, Maine?

Baltimore (BWI) – chosen by Cheapflights users on 67% of 1-stop itineraries from St. Louis to Portland, Maine on Cheapflights.

Which airport typically offers the quickest layover for flights from St. Louis to Portland, Maine?

Flights via Newark (EWR) offer the fastest connection on this route, with an average layover time of 1h 08m.

How long is the flight from St. Louis to Portland, Maine?

For as low as $320, Delta can have you in Portland, Maine from St. Louis in 4h 48m. St. Louis and Portland, Maine are separated by a distance of 1092 mi. This flight may include one or multiple stops.

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

According to our current data, United Airlines ($212), Delta ($272), and Southwest ($284) offers the cheapest pricing from St. Louis to Portland, Maine. These flights start at 51% 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?

$142 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Delta and Southwest, with prices starting from $142 and $143, respectively.

In terms of precipitation, rainfall in Portland, Maine ranges from 2.9 - 4.5 inches per month. November is typically the wettest month, when rainfall can reach 4.5 in. August is typically the driest time to visit Portland, Maine when rainfall is around 2.9 in.

If weather is an important factor for your trip to Portland, Maine, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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

Before booking your flight from St. Louis to Portland, Maine check out the most popular airlines for this route: American Airlines, Delta or Southwest.

Most accurate provider : When it comes to deals on St. Louis-Portland, Maine flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Portland, Maine flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Portland, Maine flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on St. Louis-Portland, Maine flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Portland, Maine flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from St. Louis to Portland that include hotel bookings?

Yes. In addition to deals on St. Louis to Portland flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Portland?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Portland.

Can I find deals for business class flights from St. Louis to Portland?

Yes. Cheapflights offers flight deals from St. Louis to Portland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$204+ Flights from St. Louis to Portland, ME

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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in February or December, booked 58 days in advance, depart on a Tuesday or Saturday and return on a Tuesday

Cheap flight deals from St. Louis to Portland

Cheapest flights from St. Louis to Portland
Explore the most affordable flight options available from St. Louis to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

Thu 12/256:29 amSTL - PWM

1 stop4h 48mDelta

Wed 12/315:45 amPWM - STL

1 stop7h 36mDelta

Deal found 12/10

$320

Thu 12/256:29 amSTL - PWM

1 stop4h 48mDelta

Thu 1/15:45 amPWM - STL

1 stop7h 39mDelta

Deal found 12/10

$380

Wed 12/246:29 amSTL - PWM

1 stop4h 48mDelta

Wed 12/315:45 amPWM - STL

1 stop7h 36mDelta

Deal found 12/10

$384

Thu 12/256:29 amSTL - PWM

1 stop4h 48mDelta

Mon 1/55:57 pmPWM - STL

1 stop15h 37mDelta

Deal found 12/10

$405

Thu 12/258:15 amSTL - PWM

1 stop5h 25mUnited Airlines

Mon 12/296:46 pmPWM - STL

1 stop5h 57mUnited Airlines

Deal found 12/10

$412

Thu 12/255:00 amSTL - PWM

1 stop5h 20mAmerican Airlines

Mon 1/55:20 pmPWM - STL

1 stop5h 25mAmerican Airlines

Deal found 12/9

$434

Wed 12/243:10 pmSTL - PWM

2 stops7h 49mUnited Airlines

Wed 12/317:01 pmPWM - STL

1 stop5h 56mUnited Airlines

Deal found 12/10

$444

Best flights from St. Louis to Portland
Discover carefully curated flight deals from St. Louis to Portland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 12, 2025.

Thu 12/256:29 amSTL - PWM

1 stop4h 48mDelta

Wed 12/315:45 amPWM - STL

1 stop7h 36mDelta

Deal found 12/10

$320

Thu 12/258:15 amSTL - PWM

1 stop5h 25mUnited Airlines

Mon 12/296:46 pmPWM - STL

1 stop5h 57mUnited Airlines

Deal found 12/10

$412

Thu 1/86:35 amSTL - PWM

1 stop4h 33mDelta

Thu 1/155:30 amPWM - STL

1 stop6h 35mDelta

Deal found 12/10

$335

Thu 1/811:22 amSTL - PWM

1 stop6h 28mUnited Airlines

Mon 1/127:27 pmPWM - STL

1 stop5h 32mUnited Airlines

Deal found 12/10

$415

Thu 12/256:29 amSTL - PWM

1 stop4h 48mDelta

Tue 12/305:45 amPWM - STL

1 stop7h 36mDelta

Deal found 12/10

$384

Wed 12/243:10 pmSTL - PWM

2 stops7h 49mUnited Airlines

Wed 12/317:01 pmPWM - STL

1 stop5h 56mUnited Airlines

Deal found 12/10

$444

Wed 12/243:10 pmSTL - PWM

2 stops7h 49mUnited Airlines

Mon 1/54:10 pmPWM - STL

1 stop6h 33mUnited Airlines

Deal found 12/10

$479

Wed 12/246:29 amSTL - PWM

1 stop4h 48mDelta

Thu 1/15:45 amPWM - STL

1 stop7h 39mDelta

Deal found 12/10

$483

Last-minute flights from St. Louis to Portland
Discover last-minute flight deals from St. Louis to Portland. Data last updated December 12, 2025 and is based on user searches.

Wed 12/246:29 amSTL - PWM

1 stop4h 48mDelta

Wed 12/315:45 amPWM - STL

1 stop7h 36mDelta

Deal found 12/10

$384

Thu 12/256:29 amSTL - PWM

1 stop4h 48mDelta

Wed 12/315:45 amPWM - STL

1 stop7h 36mDelta

Deal found 12/10

$320

Thu 12/256:29 amSTL - PWM

1 stop4h 48mDelta

Thu 1/15:45 amPWM - STL

1 stop7h 39mDelta

Deal found 12/10

$380

Thu 12/256:29 amSTL - PWM

1 stop4h 48mDelta

Mon 1/55:57 pmPWM - STL

1 stop15h 37mDelta

Deal found 12/10

$405

Thu 1/86:35 amSTL - PWM

1 stop4h 33mDelta

Thu 1/155:30 amPWM - STL

1 stop6h 35mDelta

Deal found 12/10

$335

Sat 1/107:00 amSTL - PWM

1 stop5h 56mUnited Airlines

Sat 1/174:10 pmPWM - STL

1 stop6h 03mUnited Airlines

Deal found 12/11

$308

Sat 1/106:00 amSTL - PWM

1 stop5h 11mDelta

Sat 1/175:30 amPWM - STL

2 stops12h 23mDelta

Deal found 12/11

$313

Wed 1/218:30 amSTL - PWM

1 stop5h 01mUnited Airlines

Mon 2/27:27 pmPWM - STL

1 stop5h 32mUnited Airlines

Deal found 12/10

$317

Wed 1/2110:19 amSTL - PWM

2 stops11h 08mDelta

Mon 2/212:10 pmPWM - STL

2 stops12h 27mDelta

Deal found 12/10

$399

One-way flights from St. Louis to Portland
Search for one-way flight options from St. Louis to Portland. Find affordable one-way fares based on user searches. Data last updated December 12, 2025.

Fri 3/66:00 amSTL - PWM

1 stop5h 13mAmerican Airlines

Deal found 12/11

$204

Sat 3/73:05 pmSTL - PWM

2 stops8h 05mSouthwest

Deal found 12/11

$209

Wed 12/243:10 pmSTL - PWM

2 stops7h 49mUnited Airlines

Deal found 12/10

$226

Wed 12/246:29 amSTL - PWM

1 stop4h 48mDelta

Deal found 12/10

$244

Mon 12/295:45 amSTL - PWM

1 stop4h 25mSouthwest

Deal found 12/10

$254

Sat 12/275:10 amSTL - PWM

1 stop5h 30mSouthwest

Deal found 12/10

$334

Fri 3/67:52 amSTL - PWM

3 stops48h 29mMultiple Airlines

Deal found 12/11

$371

Mon 12/294:27 pmSTL - PWM

3 stops48h 11mMultiple Airlines

Deal found 12/10

$377

Sat 12/203:10 pmSTL - PWM

1 stop5h 19mUnited Airlines

Deal found 12/10

$399

Find flight deals from St. Louis to Portland

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$308 (United Airlines)
One-way from	$204 (American Airlines)
Popular in	January
Cheapest in	February
Average price	$386

Provider with most accurate pricing for Lambert-St Louis-Portland flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Portland flights.

Search Deals

From Lambert-St Louis to Portland

Search Deals

One-way flight from Lambert-St Louis to Portland

Search Deals

Highest demand for flights based on searches. 3% potential increase in price ($14 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 12/25

6:29 am-12:17 pm

1 stop4h 48m

Portland

Wed 12/31

5:45 am-12:21 pm

1 stop7h 36m

$320

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 1/8

6:35 am-12:08 pm

1 stop4h 33m

Portland

Thu 1/15

5:30 am-11:05 am

1 stop6h 35m

$335

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 12/25

6:29 am-12:17 pm

1 stop4h 48m

Portland

Tue 12/30

5:45 am-12:21 pm

1 stop7h 36m

$384

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 12/25

8:15 am-2:40 pm

1 stop5h 25m

Portland

Mon 12/29

6:46 pm-11:43 pm

1 stop5h 57m

$412

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Thu 1/8

11:22 am-6:50 pm

1 stop6h 28m

Portland

Mon 1/12

7:27 pm-11:59 pm

1 stop5h 32m

$415

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Wed 12/24

3:10 pm-11:59 pm

2 stops7h 49m

Portland

Wed 12/31

7:01 pm-11:57 pm

1 stop5h 56m

$444

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Wed 12/24

3:10 pm-11:59 pm

2 stops7h 49m

Portland

Mon 1/5

4:10 pm-9:43 pm

1 stop6h 33m

$479

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Wed 12/24

6:29 am-12:17 pm

1 stop4h 48m

Portland

Thu 1/1

5:45 am-12:24 pm

1 stop7h 39m

$483

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Fri 3/6

6:00 am-12:13 pm

1 stop5h 13m

$204

St. LouisPortland

STL - PWM

STLPWM

Lambert-St Louis

Sat 3/7

6:35 am-12:00 pm

1 stop4h 25m

$204

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 18 results

Compare providers for flights from St. Louis to Portland

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Portland in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on St. Louis-Portland, Maine flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Portland, Maine flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from St. Louis-Portland, Maine flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on St. Louis-Portland, Maine flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Portland, Maine flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from St. Louis to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from St. Louis with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

Prices

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

The price you pay for your flight from St. Louis to Portland, Maine may vary depending on when you book. For the best chance of a lower fare, look to book 58 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from St. Louis to Portland, Maine?

Currently, January is the cheapest month in which you can book a flight from St. Louis to Portland, Maine (average of $116). Flying from St. Louis to Portland, Maine in June is currently the most expensive (average of $279). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to 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 in the evening, which can drop the price by up to 34% versus a flight at noon.

Reviews of airlines servicing Portland

See what other customers who have flown with Southwest, Delta, and United Airlines from St. Louis to Portland have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Southwest

7.9

Good

4,253 reviews

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Delta

7.9

Good

8,008 reviews

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

United Airlines

7.4

Good

9,095 reviews

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

American Airlines

7.2

Good

11,050 reviews

Southwest

7.9

Good

4,253 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

How long is the flight from St. Louis to Portland, Maine?
For as low as $320, Delta can have you in Portland, Maine from St. Louis in 4h 48m. St. Louis and Portland, Maine are separated by a distance of 1092 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from St. Louis to Portland, Maine round-trip?
According to our current data, United Airlines ($212), Delta ($272), and Southwest ($284) offers the cheapest pricing from St. Louis to Portland, Maine. These flights start at 51% 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?
$142 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Delta and Southwest, with prices starting from $142 and $143, respectively.
Can I find deals for flights from St. Louis to Portland that include hotel bookings?
Yes. In addition to deals on St. Louis to Portland flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Portland?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Portland.
Can I find deals for business class flights from St. Louis to Portland?
Yes. Cheapflights offers flight deals from St. Louis to Portland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from St. Louis to Portland, Maine?
Currently, January is the cheapest month in which you can book a flight from St. Louis to Portland, Maine (average of $116). Flying from St. Louis to Portland, Maine in June is currently the most expensive (average of $279). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 4 airlines flying from St. Louis to Portland

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$212	Average$569	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$284	Average$512	FlexibilityNo cancel fee	On-time63%
American Airlines	Cheapest$284	Average$408	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$298	Average$392	FlexibilityNo cancel fee	On-timeN/A

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$204+ Cheap flights from St. Louis to Portland, ME (STL - PWM)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/6. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Portland with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in February or December, booked 58 days in advance, depart on a Tuesday or Saturday and return on a Tuesday

Cheap flight deals from St. Louis to Portland

Cheapest flights from St. Louis to PortlandExplore the most affordable flight options available from St. Louis to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

Explore the most affordable flight options available from St. Louis to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.

Find flight deals from St. Louis to Portland

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Compare providers for flights from St. Louis to Portland

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Portland in December.

Best time to book a flight from St. Louis to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from St. Louis with our price prediction graph.

Cheapflights Insights

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

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

What is the cheapest month to book a flight from St. Louis to Portland, Maine?

What is the cheapest time of day to fly from STL to PWM?

What’s the top layover airport for flights from St. Louis to Portland, Maine?

What’s the cheapest layover airport for flights from St. Louis to Portland, Maine?

What’s the fastest layover option from St. Louis to Portland, Maine?

Which airport typically offers the quickest layover for flights from St. Louis to Portland, Maine?

Reviews of airlines servicing Portland

See what other customers who have flown with Southwest, Delta, and United Airlines from St. Louis to Portland have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Portland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

How long is the flight from St. Louis to Portland, Maine?

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

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

Can I find deals for flights from St. Louis to Portland that include hotel bookings?

How can I find direct flights from St. Louis to Portland?

Can I find deals for business class flights from St. Louis to Portland?

What is the cheapest month to book a flight from St. Louis to Portland, Maine?

Traveling to a place near Portland?

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Alternative routes for St. Louis to Portland

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Top 4 airlines flying from St. Louis to Portland

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Cheapest flights from St. Louis to Portland
Explore the most affordable flight options available from St. Louis to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 12, 2025.