$140 Cheap Flights from Louisville (SDF) to Seattle (SEA)

View $140 flight on Wed, Sep 24, 2025Opens in a new window

Popular airlines from Louisville Intl. Airport (SDF) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Louisville to Seattle (SDF-SEA)

Prices were available within the past 7 days and start at $140 for one-way flights and $269 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Dec 3 - Tue, Dec 9
SDF
Louisville
SEA
Seattle
$269 Roundtrip, found 7 hours ago
$269
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Wed, Dec 3 from Louisville to Seattle, returning Tue, Dec 9, priced at $269 found 7 hours ago
Delta
Wed, Oct 1 - Tue, Oct 7
SDF
Louisville
SEA
Seattle
$281 Roundtrip, found 6 days ago
$281
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, Oct 1 from Louisville to Seattle, returning Tue, Oct 7, priced at $281 found 6 days ago
American Airlines
Tue, Dec 16 - Tue, Dec 30
SDF
Louisville
SEA
Seattle
$283 Roundtrip, just found
$283
Roundtrip
just found
Select American Airlines flight, departing Tue, Dec 16 from Louisville to Seattle, returning Tue, Dec 30, priced at $283 just found
Southwest Airlines
Wed, Dec 3 - Tue, Dec 9
SDF
Louisville
SEA
Seattle
$289 Roundtrip, found 7 hours ago
$289
Roundtrip
found 7 hours ago
Select Southwest Airlines flight, departing Wed, Dec 3 from Louisville to Seattle, returning Tue, Dec 9, priced at $289 found 7 hours ago
Delta
Wed, Dec 3 - Tue, Dec 9
SDF
Louisville
SEA
Seattle
$291 Roundtrip, found 7 hours ago
$291
Roundtrip
found 7 hours ago
Select Delta flight, departing Wed, Dec 3 from Louisville to Seattle, returning Tue, Dec 9, priced at $291 found 7 hours ago
Delta
Wed, Oct 1 - Wed, Oct 8
SDF
Louisville
SEA
Seattle
$293 Roundtrip, found 2 days ago
$293
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Oct 1 from Louisville to Seattle, returning Wed, Oct 8, priced at $293 found 2 days ago
American Airlines
Mon, Sep 29 - Sat, Oct 11
SDF
Louisville
SEA
Seattle
$293 Roundtrip, found 6 days ago
$293
Roundtrip
found 6 days ago
Select American Airlines flight, departing Mon, Sep 29 from Louisville to Seattle, returning Sat, Oct 11, priced at $293 found 6 days ago
Southwest Airlines
Wed, Oct 1 - Wed, Oct 8
SDF
Louisville
SEA
Seattle
$294 Roundtrip, found 2 days ago
$294
Roundtrip
found 2 days ago
Select Southwest Airlines flight, departing Wed, Oct 1 from Louisville to Seattle, returning Wed, Oct 8, priced at $294 found 2 days ago
American Airlines
Wed, Oct 22 - Sat, Oct 25
SDF
Louisville
SEA
Seattle
$296 Roundtrip, found 5 days ago
$296
Roundtrip
found 5 days ago
Select American Airlines flight, departing Wed, Oct 22 from Louisville to Seattle, returning Sat, Oct 25, priced at $296 found 5 days ago
United
Tue, Oct 7 - Tue, Oct 14
SDF
Louisville
SEA
Seattle
$315 Roundtrip, found 3 hours ago
$315
Roundtrip
found 3 hours ago
Select United flight, departing Tue, Oct 7 from Louisville to Seattle, returning Tue, Oct 14, priced at $315 found 3 hours ago

Find the cheapest month to fly from Louisville (SDF) to Seattle (SEA)

August is typically the cheapest month to fly

From $204 - $690 per traveler.

Graph displaying average flight prices per month

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $322
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $322
Flights from Louisville (SDF) to Seattle (SEA)
Origin airport
Louisville Intl.
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Southwest Airlines, United
Roundtrip price
$269
Distance
1939 mi

Louisville to Seattle Flights

The cheapest times to fly from Louisville to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Louisville to Seattle are during the month of December. You can find some of the cheapest flights from Louisville to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Louisville to Seattle

Sunday is one of the best days to book for cheap flights from Louisville to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Louisville to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Louisville to Seattle in 2025. You can also book with separate airlines for your outbound and return journeys, from $140 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Louisville to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Louisville to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA) cost?
Snag a cheap one-way flight from $140 or cheap return flight from $269 from Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA)?
The cheapest month to fly from SDF to SEA is December, when demand is low. Off-peak season is often when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA)?
To find the cheapest airline flying from SDF to SEA, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA)?
You'll need to hop on a flight with a layover when traveling from Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from SDF to SEA?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* But this can vary depending on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA)?
To avoid possible delays on the Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA) route, travel before 3 PM. Later flights are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA) last-minute?
Last-minute bookings from SDF to SEA are generally more expensive. To secure the lowest prices, start looking for flights well ahead of time. That said, if you're flexible with your travel plans, it's possible to score a cheap ticket right before your journey.
Is it cheaper to book a SDF to SEA flight and hotel package?
You'll generally save money by booking a SDF to SEA flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one place. After selecting your ideal accommodations and flights, you can add extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from Louisville Intl. Airport (SDF) to Seattle - Tacoma Intl. Airport (SEA)?
In most instances, you're able to cancel or reschedule your SDF to SEA flight. However, additional fees may apply, especially if you made your booking more than 24 hours ago. Double-check your itinerary for the airline's guidelines and fees on flight changes, or if you want more details, visit our Customer Service portal.

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*Available to One Key members.