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$140+ 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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — SEA
Jan 27 — Feb 31
Tue 1/27
Tue 2/3
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 December 28, 2025.

This American Airlines deal was found by Cheapflights users on 12/27. 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 12/318:05 amSDF - SEA
1 stop8h 57mAmerican Airlines
Sun 1/411:20 amSEA - SDF
1 stop7h 34mAmerican Airlines
Deal found 12/27$987
This United Airlines deal was found by Cheapflights users on 12/27. 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.
Wed 12/312:22 pmSDF - SEA
1 stop9h 35mUnited Airlines
Sun 1/45:02 amSEA - SDF
2 stops12h 30mUnited Airlines
Deal found 12/27$992
This United Airlines deal was found by Cheapflights users on 12/26. 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.
Tue 12/306:00 amSDF - SEA
1 stop9h 47mUnited Airlines
Thu 1/15:02 amSEA - SDF
1 stop6h 20mUnited Airlines
Deal found 12/26$1,062
This American Airlines deal was found by Cheapflights users on 12/27. 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.
Sun 12/288:00 amSDF - SEA
1 stop9h 02mAmerican Airlines
Thu 1/17:07 amSEA - SDF
1 stop9h 35mAmerican Airlines
Deal found 12/27$1,067
This Southwest deal was found by Cheapflights users on 12/26. 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 12/306:45 amSDF - SEA
2 stops10h 20mSouthwest
Thu 1/15:15 amSEA - SDF
1 stop9h 55mSouthwest
Deal found 12/26$1,072
This Alaska Airlines deal was found by Cheapflights users on 12/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2810:49 amSDF - SEA
1 stop9h 34mAlaska Airlines
Thu 1/111:15 pmSEA - SDF
2 stops19h 18mAlaska Airlines
Deal found 12/27$1,198
This United Airlines deal was found by Cheapflights users on 12/27. 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.
Sun 12/283:18 pmSDF - SEA
2 stops10h 50mUnited Airlines
Thu 1/18:00 amSEA - SDF
2 stops11h 30mUnited Airlines
Deal found 12/27$1,313

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 December 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$279
(Delta)

One-way from

$140
(United Airlines)

Popular in

July

Cheapest in

October

Average price

$477
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. 15% potential increase in price ($79 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 28, 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

Tue 1/20

4:59 pm-8:46 pm

1 stop6h 47m

Seattle/Tacoma Intl

Sun 1/25

11:10 pm-10:01 am

1 stop7h 51m

$279

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Mon 2/9

6:12 pm-10:43 pm

1 stop7h 31m

Seattle/Tacoma Intl

Wed 2/18

12:55 pm-10:37 pm

1 stop6h 42m

$279

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Thu 1/22

6:23 am-10:55 am

1 stop7h 32m

Seattle/Tacoma Intl

Tue 1/27

11:10 pm-10:01 am

1 stop7h 51m

$279

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Sat 2/7

3:22 pm-9:25 pm

1 stop9h 03m

Seattle/Tacoma Intl

Sat 3/7

7:00 am-4:46 pm

1 stop6h 46m

$279

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Wed 1/21

4:59 pm-8:46 pm

1 stop6h 47m

Seattle/Tacoma Intl

Sun 1/25

11:10 pm-10:01 am

1 stop7h 51m

$279

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Fri 1/23

4:59 pm-8:46 pm

1 stop6h 47m

Seattle/Tacoma Intl

Thu 1/29

11:10 pm-10:01 am

1 stop7h 51m

$279

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Tue 1/20

4:59 pm-8:46 pm

1 stop6h 47m

Seattle/Tacoma Intl

Tue 1/27

11:10 pm-10:01 am

1 stop7h 51m

$279

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Thu 1/22

6:23 am-10:55 am

1 stop7h 32m

Seattle/Tacoma Intl

Sun 1/25

11:10 pm-10:01 am

1 stop7h 51m

$279

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Fri 1/23

9:50 am-6:26 pm

2 stops11h 36m

Seattle/Tacoma Intl

Mon 2/2

12:25 pm-10:24 pm

1 stop6h 59m

$284

LouisvilleSeattle

SDF - SEA

SDFSEA

Louisville Intl

Tue 1/20

5:35 am-11:32 am

1 stop8h 57m

Seattle/Tacoma Intl

Wed 1/28

9:00 am-10:24 pm

2 stops10h 24m

$284

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/27

Showing 1-10 of 18 results
1
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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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Louisville-Seattle flight deals on Cheapflights vs. eDreams >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 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 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 December 26, 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, October is the cheapest month in which you can book a flight from Louisville to Seattle (average of $132). Flying from Louisville to Seattle in July is currently the most expensive (average of $248). 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 December 28, 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 17% 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.

How much does it cost to fly round-trip from Louisville to Seattle?

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 December 28, 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
11,551 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,551 reviews
Alaska Airlines
8.0
Very good
11,551 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Southwest
8.0
Very good
4,256 reviews
Alaska Airlines
8.0
Very good
11,551 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,019 reviews
Alaska Airlines
8.0
Very good
11,551 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
United Airlines
7.4
Good
9,113 reviews
Alaska Airlines
8.0
Very good
11,551 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
American Airlines
7.2
Good
11,073 reviews
Alaska Airlines
8.0
Very good
11,551 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

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 10h 30m. Fly via American Airlines 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 53% 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 $134 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, October is the cheapest month in which you can book a flight from Louisville to Seattle (average of $132). Flying from Louisville to Seattle in July is currently the most expensive (average of $248). 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
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Edmonds
Lynnwood
Renton
Puyallup
Kirkland
Kent
Tukwila
Cle Elum
Marysville
Fife
Aberdeen
Shoreline
Centralia
Federal Way
Chehalis

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 December 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$209Average$410FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$270Average$515FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$292Average$435FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$350Average$498FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$506Average$616FlexibilityNo cancel feeOn-time75%

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