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$178+ Cheap flights from Louisville to Seattle (SDF - SEA)

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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — SEA
Apr 22 — Apr 291
Wed 4/22
Wed 4/29
1 adult, Economy
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Cheap flight deals from Louisville to Seattle

Cheapest flights from Louisville to Seattle
Explore the most affordable flight options available from Louisville to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 23, 2026.

This American Airlines deal was found by Cheapflights users on 3/23. 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.
Tue 5/266:56 pm
SDF
-
SEA
1 stop8h 20m
American Airlines
Mon 6/111:58 pm
SEA
-
SDF
1 stop7h 19m
American Airlines
Deal found 3/23$324
This Southwest deal was found by Cheapflights users on 3/22. 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.
Fri 5/18:10 pm
SDF
-
SEA
1 stop6h 55m
Southwest
Tue 5/59:20 am
SEA
-
SDF
1 stop10h 10m
Southwest
Deal found 3/22$355
This Kiwi.com deal was found by Cheapflights users on 3/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/69:21 am
SDF
-
SEA
1 stop12h 14m
Multiple Airlines
Tue 5/1911:06 am
SEA
-
SDF
1 stop29h 20m
Multiple Airlines
Deal found 3/22$358
This American Airlines deal was found by Cheapflights users on 3/20. 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 5/276:02 pm
SDF
-
SEA
1 stop7h 30m
American Airlines
Wed 6/310:27 am
SEA
-
SDF
1 stop8h 52m
American Airlines
Deal found 3/20$375
This Southwest deal was found by Cheapflights users on 3/23. 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.
Tue 5/53:30 pm
SDF
-
SEA
2 stops11h 05m
Southwest
Sun 5/1011:55 pm
SEA
-
SDF
1 stop7h 00m
Southwest
Deal found 3/23$381
This American Airlines deal was found by Cheapflights users on 3/23. 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.
Fri 5/18:10 pm
SDF
-
SEA
1 stop7h 34m
American Airlines
Mon 5/411:16 am
SEA
-
SDF
1 stop9h 32m
American Airlines
Deal found 3/23$385
This Delta deal was found by Cheapflights users on 3/22. 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.
Tue 4/286:00 am
SDF
-
SEA
1 stop8h 05m
Delta
Wed 5/66:00 am
SEA
-
SDF
1 stop7h 01m
Delta
Deal found 3/22$387
This American Airlines deal was found by Cheapflights users on 3/19. 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 5/237:40 pm
SDF
-
SEA
1 stop7h 36m
American Airlines
Wed 5/276:00 am
SEA
-
SDF
1 stop9h 26m
American Airlines
Deal found 3/19$388
This Southwest deal was found by Cheapflights users on 3/23. 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.
Fri 5/18:10 pm
SDF
-
SEA
1 stop6h 55m
Southwest
Mon 5/49:00 pm
SEA
-
SDF
2 stops9h 50m
Southwest
Deal found 3/23$391
This Southwest deal was found by Cheapflights users on 3/22. 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.
Tue 4/214:40 pm
SDF
-
SEA
2 stops10h 30m
Southwest
Tue 4/2811:45 pm
SEA
-
SDF
1 stop7h 05m
Southwest
Deal found 3/22$392
This American Airlines deal was found by Cheapflights users on 3/20. 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 4/256:07 am
SDF
-
SEA
1 stop7h 44m
American Airlines
Thu 5/1411:55 pm
SEA
-
SDF
1 stop7h 20m
American Airlines
Deal found 3/20$393
This Southwest deal was found by Cheapflights users on 3/21. 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.
Sat 4/253:15 pm
SDF
-
SEA
2 stops8h 20m
Southwest
Sat 5/28:30 am
SEA
-
SDF
2 stops11h 50m
Southwest
Deal found 3/21$397

Find flight deals from Louisville to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Louisville (SDF) to Seattle (SEA). 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 March 23, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$324
(American Airlines)

One-way from

$178
(Southwest)

Popular in

July

Cheapest in

January

Average price

$443
Provider with most accurate pricing for Louisville Intl-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Louisville Intl-Seattle/Tacoma Intl flights.
Search Deals
From Louisville Intl to Seattle/Tacoma Intl
Search Deals
One-way flight from Louisville Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($72 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Louisville to Seattle 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 March 23, 2026.
Use the filters below to find and compare flights from Louisville to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Sat 8/22

12:40 pm-5:45 pm

1 stop8h 05m

Seattle/Tacoma Intl

Mon 8/31

5:15 am-2:25 pm

1 stop6h 10m

$457

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Tue 7/21

1:20 pm-8:24 pm

1 stop10h 04m

Seattle/Tacoma Intl

Mon 8/3

11:53 pm-12:03 pm

1 stop9h 10m

$457

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Tue 5/26

5:20 am-9:40 am

1 stop7h 20m

Seattle/Tacoma Intl

Mon 6/1

10:40 pm-9:02 am

1 stop7h 22m

$457

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Tue 9/1

2:15 pm-8:29 pm

1 stop9h 14m

Seattle/Tacoma Intl

Tue 9/8

11:53 pm-12:03 pm

1 stop9h 10m

$457
Quickest round-trip

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Mon 6/22

5:20 am-9:40 am

1 stop7h 20m

Seattle/Tacoma Intl

Sun 6/28

11:52 pm-9:05 am

1 stop6h 13m

$457

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Wed 7/22

7:49 pm-11:58 pm

1 stop7h 09m

Seattle/Tacoma Intl

Wed 8/5

5:20 am-4:47 pm

1 stop8h 27m

$457

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Wed 8/5

8:15 am-3:00 pm

2 stops9h 45m

Seattle/Tacoma Intl

Fri 8/14

5:15 am-2:25 pm

1 stop6h 10m

$462

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Sat 6/20

7:55 pm-1:10 am

1 stop8h 15m

Seattle/Tacoma Intl

Sun 6/28

10:45 pm-12:00 pm

1 stop10h 15m

$462

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Sat 7/11

7:55 pm-1:10 am

1 stop8h 15m

Seattle/Tacoma Intl

Thu 7/16

10:45 pm-12:00 pm

1 stop10h 15m

$462

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Mon 8/3

6:05 pm-11:05 pm

2 stops8h 00m

Seattle/Tacoma Intl

Tue 8/11

11:05 pm-12:40 pm

2 stops10h 35m

$467

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/18

Showing 1-10 of 23 resultsSorted by cheapest first
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Compare providers for flights from Louisville to Seattle

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 Louisville to Seattle in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust 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 Louisville-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Louisville-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Louisville-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Louisville-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub 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 Louisville-Seattle 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 Louisville to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle 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 Seattle

How far ahead should I book a flight from Louisville to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Louisville to Seattle. Price data was last updated on March 13, 2026.

The best time to book flights from Louisville to Seattle is 89 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 Seattle?

Currently, December is the cheapest month in which you can book a flight from Louisville to Seattle (average of $118). Flying from Louisville to Seattle in July is currently the most expensive (average of $243). 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.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated March 23, 2026.
Peruse reviews from past customers who have flown with Southwest,Alaska Airlines, andDelta from Louisville to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,324 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Alaska Airlines
7.9
Good
12,098 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,319 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,462 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,488 reviews
Southwest
8.0
Very good
4,324 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

Related info for your journey

Find useful and relevant information for your journey from Louisville to Seattle. 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 Louisville to Seattle?

    There are many flights that can get you from Louisville to Seattle in 7h 20m. Fly via Southwest, Delta, or United Airlines to get the fastest option. Louisville and Seattle are separated by a distance of 1939 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from Louisville to Seattle round-trip?

    Delta, at $206, was found to be the cheapest airline from Louisville to Seattle.Alternate airlines to your destination round-trip include United Airlines and American Airlines. Delta is 51% 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 Seattle one-way?

    One-way options have recently been found by users for as low as $128 on American Airlines. Other airlines that offer cheap prices include Delta from $133 and Southwest from $171 one-way.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Louisville to Seattle 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 Seattle?

    Currently, December is the cheapest month in which you can book a flight from Louisville to Seattle (average of $118). Flying from Louisville to Seattle in July is currently the most expensive (average of $243). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tacoma
Ocean Shores
Olympia
Kent
Lynnwood
Edmonds
Lacey
Renton
Puyallup
Kirkland
Ellensburg
Tukwila
Fife
Lakewood
Aberdeen
Shoreline
Marysville
Centralia
Federal Way

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from Louisville to Seattle

Discover the top 5 airlines that operate flights from Louisville to Seattle. 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 March 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$206Average$416FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$264Average$478FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$270Average$441FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$336Average$493FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$430Average$577FlexibilityNo cancel feeOn-time75%

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