$143+ 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 8/14. 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
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Lambert-St Louis to Portland are usually found in January or November, booked 58 days in advance, depart on a Tuesday or Saturday and return on a Tuesday
Cheap flight deals from St. Louis to Portland
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Portland (PWM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 12, 2025.
Round-trip from | $271 (Booking.com) |
|---|---|
One-way from | $143 (American Airlines) |
Popular in | March |
Cheapest in | January |
Average price | $466 |
Find 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 June 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 June 12, 2025.
This Booking.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This American Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Delta deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Mytrip deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Southwest deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Mytrip deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Portland 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, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
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
Fri 8/8
5:40 pm-6:13 pm
1 stop23h 33m
Portland
Sat 8/16
6:58 pm-11:47 pm
1 stop29h 49m
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 9/10
5:55 am-11:47 am
1 stop4h 52m
Portland
Wed 9/17
6:00 am-10:21 am
1 stop5h 21m
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Wed 9/10
6:00 am-12:59 pm
1 stop5h 59m
Portland
Wed 9/17
6:30 am-6:02 pm
2 stops12h 32m
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Tue 9/9
3:20 pm-9:59 pm
1 stop5h 39m
Portland
Sat 9/13
6:00 am-10:46 am
1 stop5h 46m
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sun 7/6
6:36 am-11:17 am
1 stop27h 41m
Portland
Sun 7/13
12:46 pm-7:31 pm
1 stop7h 45m
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Mon 8/4
5:05 pm-12:05 am
1 stop6h 00m
Portland
Fri 8/8
5:50 am-11:30 am
1 stop6h 40m
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Sun 7/6
6:36 am-11:17 am
1 stop27h 41m
Portland
Sun 7/13
12:46 pm-4:45 pm
3 stops28h 59m
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Thu 8/14
6:02 am-1:33 pm
1 stop6h 31m
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Tue 7/29
7:00 am-4:05 pm
2 stops8h 05m
St. LouisPortland
STL - PWM
STLPWM
Lambert-St Louis
Thu 7/10
2:45 pm-12:05 am
2 stops8h 20m
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?
Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Portland. Price data was last updated on June 9, 2025.
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 $296). Flying from St. Louis to Portland, Maine in July is currently the most expensive (average of $394). 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?
Find hourly flight availability from St. Louis to Portland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.
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 35% versus a flight at noon.
Rainfall in Portland by month
Plan your trip to Portland by taking into account the average rainfall totals by month.
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.
Temperature in Portland by month
Plan your trip to Portland by taking into account the average temperature totals by month.
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).
Reviews of airlines servicing Portland
Get insights into the airlines that provide service to Portland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portland. Reviews last updated June 12, 2025.
Read reviews from past customers who have flown Southwest, Delta and United Airlines 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.
Food
Comfort
Crew
Entertainment
Overall
Boarding
Reviews
John,May 2025
PVD - BNA
Food
Comfort
Crew
Entertainment
Overall
Boarding
Reviews
John,May 2025
PVD - BNA
Food
Comfort
Crew
Entertainment
Overall
Boarding
Reviews
John,May 2025
PVD - BNA
Food
Comfort
Crew
Entertainment
Overall
Boarding
Reviews
John,May 2025
PVD - BNA
Food
Comfort
Crew
Entertainment
Overall
Boarding
Reviews
John,May 2025
PVD - BNA
Food
Comfort
Crew
Entertainment
Overall
Boarding
Reviews
John,May 2025
PVD - BNA
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.
Traveling to a place near St. Louis?
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Alternative routes for St. Louis to Portland
See prices for flight routes from nearby airports that may be better suited for you.
Top 4 airlines flying from St. Louis to Portland
Discover the top 4 airlines that operate flights from St. Louis to Portland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$286 | Average$390 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$301 | Average$388 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$316 | Average$461 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$336 | Average$506 | FlexibilityNo cancel fee | On-time69% |