HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portland

$105+ Cheap flights from Louisville to Portland, ME (SDF - 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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — PWM
Aug 18 — Aug 251
Mon 8/18
Mon 8/25
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Louisville 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 Louisville Intl to Portland are usually found in August or April, booked 73 days in advance, depart on a Monday or Sunday and return on a Wednesday

Cheap flight deals from Louisville to Portland

Discover tips and strategies to find the most affordable flight options for your journey from Louisville (SDF) 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 August 13, 2025.

Round-trip from

$237
(American Airlines)

One-way from

$105
(American Airlines)

Popular in

March

Cheapest in

August

Average price

$331
From Louisville Intl to Portland
Search Deals
One-way flight from Louisville Intl to Portland
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Louisville to Portland

Cheapest flights from Louisville to Portland
Explore the most affordable flight options available from Louisville to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 13, 2025.

This American Airlines deal was found by Cheapflights users on 8/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/62:42 pmSDF - PWM
1 stop8h 01mAmerican Airlines
Sat 9/135:20 pmPWM - SDF
1 stop5h 02mAmerican Airlines
Deal found 8/10$237
This Delta deal was found by Cheapflights users on 8/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/66:00 pmSDF - PWM
1 stop6h 03mDelta
Sat 9/136:00 amPWM - SDF
2 stops8h 53mDelta
Deal found 8/11$242
This American Airlines deal was found by Cheapflights users on 8/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/247:35 pmSDF - PWM
1 stop4h 10mAmerican Airlines
Tue 9/306:01 amPWM - SDF
1 stop8h 02mAmerican Airlines
Deal found 8/10$253
This American Airlines deal was found by Cheapflights users on 8/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/247:35 pmSDF - PWM
1 stop4h 10mAmerican Airlines
Sat 9/275:20 pmPWM - SDF
1 stop5h 02mAmerican Airlines
Deal found 8/10$267
This American Airlines deal was found by Cheapflights users on 8/11. 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.
Thu 9/116:30 pmSDF - PWM
1 stop4h 35mAmerican Airlines
Sat 9/206:00 amPWM - SDF
1 stop4h 41mAmerican Airlines
Deal found 8/11$268
This Delta deal was found by Cheapflights users on 8/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/112:22 pmSDF - PWM
2 stops9h 49mDelta
Sat 9/206:33 pmPWM - SDF
1 stop4h 11mDelta
Deal found 8/11$272
This Southwest deal was found by Cheapflights users on 8/12. 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.
Sun 10/195:15 amSDF - PWM
1 stop4h 25mSouthwest
Fri 10/245:45 amPWM - SDF
1 stop6h 50mSouthwest
Deal found 8/12$281
This Delta deal was found by Cheapflights users on 8/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/16:00 pmSDF - PWM
1 stop6h 11mDelta
Tue 10/76:01 amPWM - SDF
1 stop6h 48mDelta
Deal found 8/11$288

Cheapflights Fare Finder

 
Customize your flight search to find flights from Louisville 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 August 13, 2025.
Use the filters below to find and compare flights from Louisville to Portland that are best for you.

Fly from

Louisville

Fly to

Portland

Route

Depart

Return

Price

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Sat 9/13

7:35 am-12:29 pm

1 stop4h 54m

Portland

Thu 9/18

6:05 pm-11:59 pm

1 stop5h 54m

$237

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Sat 9/6

2:42 pm-10:43 pm

1 stop8h 01m

Portland

Sat 9/13

5:20 pm-10:22 pm

1 stop5h 02m

$237

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Sat 9/6

6:00 pm-12:03 am

1 stop6h 03m

Portland

Sat 9/13

6:00 am-2:53 pm

2 stops8h 53m

$242

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Wed 9/24

7:35 pm-11:45 pm

1 stop4h 10m

Portland

Tue 9/30

6:01 am-2:03 pm

1 stop8h 02m

$253

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Wed 9/24

7:35 pm-11:45 pm

1 stop4h 10m

Portland

Sat 9/27

5:20 pm-10:22 pm

1 stop5h 02m

$267

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Thu 9/11

6:30 pm-11:05 pm

1 stop4h 35m

Portland

Sat 9/20

6:00 am-10:41 am

1 stop4h 41m

$268

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Wed 9/17

6:00 am-1:07 pm

1 stop7h 07m

$105

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Wed 9/17

5:30 am-9:50 am

1 stop4h 20m

$119

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Tue 10/7

6:00 am-10:49 am

1 stop4h 49m

$119

LouisvillePortland

SDF - PWM

SDFPWM

Louisville Intl

Fri 10/10

9:31 pm-5:38 pm

2 stops20h 07m

$184

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

Showing 1-10 of 14 results
1
2

Best time to book a flight from Louisville to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from Louisville 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 Louisville to Portland

How far ahead should I book a flight from Louisville to Portland, Maine?

Use this chart to determine the optimal time to book a round-trip flight from Louisville to Portland. Price data was last updated on August 8, 2025.

The best time to book flights from Louisville to Portland, Maine is 73 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Louisville to Portland, Maine?

Currently, January is the cheapest month in which you can book a flight from Louisville to Portland, Maine (average of $296). Flying from Louisville 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 SDF to PWM?

Find hourly flight availability from Louisville 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 August 13, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 25% on flights from Louisville to Portland, Maine by exploring options for tickets in the evening.

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 August 13, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Louisville to Portland. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,979 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,920 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

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

  • What is the cheapest airline to fly from Louisville to Portland, Maine round-trip?

    Cheapflights users have booked flights from Louisville to Portland, Maine round-trip from $237. American Airlines is 44% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Louisville to Portland, Maine one-way?

    The cheapest airlines for a one-way flight from Louisville to Portland, Maine are American Airlines ($105), Southwest ($119), and Delta ($119).

  • Can I find deals for flights from Louisville to Portland that include hotel bookings?

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

  • How can I find direct flights from Louisville to Portland?

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

  • Can I find deals for business class flights from Louisville to Portland?

    Yes. Cheapflights offers flight deals from Louisville 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 Louisville to Portland, Maine?

    Currently, January is the cheapest month in which you can book a flight from Louisville to Portland, Maine (average of $296). Flying from Louisville 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.

See more FAQs

Traveling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Brunswick
North Conway
Auburn
Conway
Lewiston

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Louisville to Portland

See prices for flight routes from nearby airports that may be better suited for you.
Cincinnati to Boston flights
Nashville to Boston flights
Louisville to Boston flights
Lexington to Boston flights
Cincinnati to Portland flights
Nashville to Portland flights
Cincinnati to Bangor flights
Lexington to Portland flights
Knoxville to Portland flights
Knoxville to Boston flights
Lexington to Bangor flights
Nashville to Bangor flights
Knoxville to Bangor flights
Louisville to Bangor flights
Evansville to Boston flights
Blountville to Portland flights
Blountville to Boston flights
Cincinnati to Bar Harbor flights
Nashville to Augusta flights
Evansville to Portland flights
Blountville to Bangor flights
Huntington to Boston flights
Huntington to Portland flights
Cincinnati to Rockland flights
Owensboro to Boston flights
Louisville to Bar Harbor flights
Evansville to Bangor flights

Top 4 airlines flying from Louisville to Portland

Discover the top 4 airlines that operate flights from Louisville 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 August 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$256Average$388FlexibilityNo cancel feeOn-time71%
DeltaCheapest$258Average$331FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$296Average$429FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$382Average$541FlexibilityNo cancel feeOn-time69%

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.