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$139+ 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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — SEA
Aug 19 — Aug 261
Di 8/19
Di 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Louisville Intl to Seattle/Tacoma Intl are usually found in October or January, booked 69 days in advance, depart on a Tuesday or Friday and return on a Saturday

Cheap 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 August 14, 2025.

Round-trip from

$269
(American Airlines)

One-way from

$139
(American Airlines)

Popular in

July

Cheapest in

October

Average price

$496
From Louisville Intl to Seattle/Tacoma Intl
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One-way flight from Louisville Intl to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 13% potential increase in price ($70 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find 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 August 14, 2025.

This American Airlines deal was found by Cheapflights users on 8/14. 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.
Mi 10/82:13 pmSDF - SEA
1 stop13h 14mAmerican Airlines
Fr 10/1012:34 amSEA - SDF
1 stop10h 13mAmerican Airlines
Deal found 8/14$269
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 9/254:20 pmSDF - SEA
1 stop26h 25mMultiple Airlines
Sa 10/49:39 pmSEA - SDF
1 stop17h 00mMultiple Airlines
Deal found 8/12$271
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 10/2112:58 pmSDF - SEA
1 stop10h 12mAmerican Airlines
Di 10/2812:34 amSEA - SDF
1 stop10h 09mAmerican Airlines
Deal found 8/12$273
This Delta deal was found by Cheapflights users on 8/14. 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.
Di 10/217:15 pmSDF - SEA
1 stop7h 42mDelta
Mi 10/2911:40 amSEA - SDF
1 stop9h 19mDelta
Deal found 8/14$277
This Kiwi.com deal was found by Cheapflights users on 8/14. 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.
Mi 10/110:14 amSDF - SEA
2 stops32h 17mMultiple Airlines
So 10/51:22 pmSEA - SDF
1 stop21h 40mMultiple Airlines
Deal found 8/14$287
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 10/41:06 pmSDF - SEA
1 stop9h 59mAmerican Airlines
Fr 10/1012:34 amSEA - SDF
1 stop10h 13mAmerican Airlines
Deal found 8/12$293
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 9/41:09 pmSDF - SEA
1 stop9h 50mAmerican Airlines
Di 9/96:42 amSEA - SDF
1 stop8h 57mAmerican Airlines
Deal found 8/12$297
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 10/112:25 pmSDF - SEA
1 stop7h 28mAmerican Airlines
Fr 10/316:10 amSEA - SDF
1 stop12h 35mAmerican Airlines
Deal found 8/12$298
This American Airlines 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 11/14:36 pmSDF - SEA
1 stop10h 51mAmerican Airlines
Fr 11/711:42 amSEA - SDF
1 stop8h 17mAmerican Airlines
Deal found 8/12$303
This Delta deal was found by Cheapflights users on 8/13. 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.
Di 9/96:00 pmSDF - SEA
1 stop8h 59mDelta
Fr 9/1211:40 pmSEA - SDF
1 stop9h 09mDelta
Deal found 8/13$307
This Kiwi.com deal was found by Cheapflights users on 8/14. 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.
Sa 9/1310:14 amSDF - SEA
2 stops41h 16mMultiple Airlines
Sa 9/209:39 pmSEA - SDF
1 stop17h 00mMultiple Airlines
Deal found 8/14$309
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.
Sa 9/273:40 pmSDF - SEA
1 stop9h 36mDelta
Mo 9/2911:40 pmSEA - SDF
1 stop9h 09mDelta
Deal found 8/11$317

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 August 14, 2025.
Use the filters below to find and compare flights from Louisville to Seattle that are best for you.

Fly from

Louisville

Fly to

Seattle

Route

Depart

Return

Price

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Sa 10/4

7:00 am-5:29 pm

1 stop13h 29m

Seattle/Tacoma Intl

Fr 10/10

12:34 am-1:47 pm

1 stop10h 13m

$269

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Mi 10/8

2:13 pm-12:27 am

1 stop13h 14m

Seattle/Tacoma Intl

Fr 10/10

12:34 am-1:47 pm

1 stop10h 13m

$269

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Do 9/25

4:20 pm-3:45 pm

1 stop26h 25m

Seattle/Tacoma Intl

Sa 10/4

9:39 pm-5:39 pm

1 stop17h 00m

$271

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Di 10/21

12:58 pm-8:10 pm

1 stop10h 12m

Seattle/Tacoma Intl

Di 10/28

12:34 am-1:43 pm

1 stop10h 09m

$273

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Di 10/21

6:05 pm-10:03 pm

1 stop6h 58m

Seattle/Tacoma Intl

Mi 10/29

11:40 am-11:59 pm

1 stop9h 19m

$277

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Mi 9/17

4:41 pm-9:23 pm

1 stop7h 42m

$139

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Fr 10/10

8:08 pm-7:48 pm

1 stop26h 40m

$150

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Do 10/2

6:34 pm-7:36 pm

1 stop28h 02m

$155

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Mo 12/15

6:28 pm-11:05 pm

1 stop7h 37m

$159

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Di 9/2

11:50 am-9:40 pm

1 stop12h 50m

$164

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 13 results
1
2

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 August 8, 2025.

The best time to book flights from Louisville to Seattle is 69 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, January is the cheapest month in which you can book a flight from Louisville to Seattle (average of $238). Flying from Louisville to Seattle in June is currently the most expensive (average of $389). 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 SEA?

Find hourly flight availability from Louisville to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

A simple way to save on the total cost of your ticket is to fly from Louisville to Seattle in the evening. If you’re flexible enough to do this you can expect to save up to 18% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Louisville to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Louisville to Seattle. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Louisville to Seattle flight should consider departing on Wednesday evenings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 August 14, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Overall

8.0

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Overall

8.0

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Southwest
8.0
Very good
4,244 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Overall

8.0

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Overall

8.0

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
United Airlines
7.4
Good
8,916 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Overall

8.0

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Overall

8.0

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.

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.

  • 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 54% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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, January is the cheapest month in which you can book a flight from Louisville to Seattle (average of $238). Flying from Louisville to Seattle in June is currently the most expensive (average of $389). 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
Tukwila
Tacoma
Ocean Shores
Lakewood
Lynnwood
Lacey
Leavenworth
Renton
Olympia
Puyallup
Kent
Cle Elum
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline
Federal Way
Shelton

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Louisville to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$206Average$408FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$274Average$519FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$319Average$445FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$354Average$496FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$506Average$617FlexibilityNo cancel feeOn-time75%

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