SDF - SEA

$156 Find Cheap Flights from Louisville to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Louisville to Seattle departing on 6/30. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Louisville to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Louisville to Seattle, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$311
Typical prices: $598-$466
Delta
Wed 7/1Sat 7/4
SDF - SEA • 1 stop
Cheapest one-way
$156
Typical prices: $238-$336
American Airlines
Tue 6/30
SDF - SEA • 1 stop
Top airlines
Cheapest • from $311 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
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Nonstop flights
Not available
There are currently no direct flights between Louisville and Seattle. You'll need at least 1 connection.
Insights
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Top layover airports
Cheapest • Avg $370 (round-trip)
Shortest trip • 7h 12m (one-way)
Insights
Insights
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Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 46% compared to booking last minute.
Insights
Insights
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Insights
When to travel
Cheapest • 33% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Louisville to Seattle (SDF-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Louisville to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Louisville to Seattle

Wed, Jul 1 - Sat, Jul 4
Delta Logo
7:51 pm - 11:59 pm
SDF
-
SEA
7h 08m
1 stop
Delta Logo
5:30 am - 4:46 pm
SEA
-
SDF
8h 16m
1 stop
$311Delta
Mon, Aug 31 - Sat, Sep 5
Delta Logo
4:30 pm - 10:00 pm
SDF
-
SEA
8h 30m
1 stop
Delta Logo
9:53 am - 9:19 pm
SEA
-
SDF
8h 26m
1 stop
$346Delta
Tue, Sep 1 - Tue, Sep 8
Southwest Logo
12:10 pm - 6:10 pm
SDF
-
SEA
9h 00m
1 stop
Southwest Logo
11:05 pm - 11:15 am
SEA
-
SDF
9h 10m
1 stop
$355Southwest
Wed, Aug 12 - Wed, Aug 19
American Airlines Logo
8:16 am - 4:20 pm
SDF
-
SEA
11h 04m
1 stop
American Airlines Logo
12:15 pm - 11:11 pm
SEA
-
SDF
7h 56m
1 stop
$359American Airlines
Tue, Sep 1 - Tue, Sep 8
Southwest Logo
11:50 am - 8:15 pm
SDF
-
SEA
11h 25m
2 stops
Southwest Logo
11:05 pm - 11:15 am
SEA
-
SDF
9h 10m
1 stop
$360Southwest
Wed, Jul 15 - Tue, Jul 28
American Airlines Logo
7:10 pm - 12:52 am
SDF
-
SEA
8h 42m
1 stop
American Airlines Logo
11:56 pm - 10:03 am
SEA
-
SDF
7h 07m
1 stop
$362American Airlines
Wed, Jul 15 - Tue, Jul 28
American Airlines Logo
7:10 pm - 12:52 am
SDF
-
SEA
8h 42m
1 stop
American Airlines Logo
11:56 pm - 10:03 am
SEA
-
SDF
7h 07m
1 stop
$365American Airlines
Tue, Sep 1 - Tue, Sep 8
Southwest Logo
4:00 pm - 11:05 pm
SDF
-
SEA
10h 05m
2 stops
Southwest Logo
11:05 pm - 12:10 pm
SEA
-
SDF
10h 05m
2 stops
$366Southwest
Tue, Sep 22 - Thu, Oct 8
Delta Logo
1:15 pm - 7:01 pm
SDF
-
SEA
8h 46m
1 stop
Delta Logo
11:53 pm - 10:17 am
SEA
-
SDF
7h 24m
1 stop
$368Delta
Tue, Sep 15 - Tue, Sep 22
Southwest Logo
10:50 am - 6:10 pm
SDF
-
SEA
10h 20m
2 stops
Southwest Logo
6:40 am - 8:35 pm
SEA
-
SDF
10h 55m
2 stops
$371Southwest
Booking Insights

KAYAK's insights & trends for Louisville to Seattle flights

Get data-powered insights and trends into flights from Louisville to Seattle to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Louisville to Seattle?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Louisville to Seattle departing in July.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Louisville to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Louisville to Seattle is January, where tickets cost $299 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is $586 and $566 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Louisville to Seattle, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Louisville to Seattle, you should book around 4 weeks before departure, which saves you about 46% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 10 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$156
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly with an average 6% increase in price.
Flight from Louisville to Seattle

When to book flights from Louisville to Seattle

Are your dates flexible? Find out the best times to travel from Louisville to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Louisville to Seattle

  • How do I get to downtown Seattle from Seattle–Tacoma International Airport (SEA)?

    SEA is connected to downtown Seattle via the LINK Light Rail system at the Airport Parking Garage, Level 4, which operates every 6 to 15 minutes on weekdays and 10 to 15 minutes on weekends and holidays. The ride to downtown Seattle takes around 40 minutes. You can also take the King County Metro buses, which connect the airport to downtown Seattle. Other options include the Sound Transit express buses, taxis, car rentals, ridesharing, and hotel shuttles.

  • Which airlines offer an unaccompanied minor service on flights from Louisville to Seattle?

    American Airlines, United Airlines, and Delta Airlines offer an unaccompanied minor service for children flying alone from Louisville to Seattle. This service is mandatory for children aged 8 to 14 and optional for children aged 15 to 17 on all airlines. Children below 8 are only allowed to travel alone on direct flights. Your child will be escorted and receive necessary help throughout the flight.

  • What assistance does Louisville Muhammad Ali International Airport (SDF) offer travelers with limited mobility?

    Travelers with special needs or reduced mobility flying through Louisville Muhammad Ali International Airport (SDF) can access several services and amenities, including accessible parking, wheelchair assistance, accessible restrooms, specially-designed ramps, elevators, and the GoodMaps program to enable travelers with low vision to move through the terminal safely. For wheelchair assistance, contact your airline when making your reservation.

  • Are there hotels near Seattle–Tacoma International Airport (SEA)?

    For hotels close to Seattle–Tacoma International Airport (SEA), you can check into Hilton Seattle Airport & Conference Center, Radisson Hotel Seattle Airport, Crowne Plaza Seattle Airport, Red Roof Inn Seattle Airport SEATAC, La Quinta Inn & Suites Seattle SeaTac Airport, Red Lion Hotel Seattle Airport, which offer a free shuttle from the airport.

  • What is the cheapest flight from Louisville to Seattle?

    In the last 5 days, the lowest price for a flight from Louisville to Seattle was $156 for a one-way ticket and $311 for a round-trip.

  • Do I need a passport to fly between Louisville and Seattle?

    No

  • Which aircraft models fly most regularly from Louisville to Seattle?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Louisville to Seattle?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between Louisville and Seattle, with SkyTeam being the most commonly used for this route.

  • What is the most popular layover when flying to Seattle from Louisville?

    Chicago is the most popular layover city among KAYAK users traveling from Louisville to Seattle.

  • Which is the best airline for flights from Louisville to Seattle, Southwest or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from Louisville to Seattle are Southwest and Alaska Airlines. With an average price for the route of $505 and an overall rating of 7.9, Southwest is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $637 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Louisville to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Louisville to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Louisville to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Louisville is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Louisville to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Louisville with another airline. Booking your flights between Louisville and SEA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Louisville to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Louisville up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Louisville to Seattle

  • The Louisville (SDF) to Seattle (SEA) route is mainly served by one-stop flights. Common layover cities for one-stop flights on this route include Chicago (ORD), Las Vegas (LAS), Dallas (DFW), Detroit (DTW), Denver (DEN), Minneapolis (MSP), Charlotte (CLT), Los Angeles (LAX), Houston (IAD), and Atlanta (ATL). The layover city depends on the flight route.
  • For Business Class flights from Louisville to Seattle, consider booking American Airlines, United Airlines, or Delta Airlines, which offer this travel option on some of their connecting flights on this route. General Business Class benefits and amenities these airlines offer include spacious cabins with comfortable seats, special baggage allowance, premium dining, priority check-in and boarding, in-flight entertainment, and access to specific lounges.
  • American Airlines, United Airlines, Spirit Airlines, and Delta Airlines have no maximum weight limit for carry-on bags on flights from Louisville to Seattle. However, your carry-on bag and personal item shouldn’t exceed the required dimensions and perfectly fit in the overhead compartment and underneath the seat in front of you.
  • If you’re mindful of the environment, you can book Spirit Airlines, American Airlines, United Airlines, Alaska Airlines, or United Airlines, which have reduced carbon emissions on their flights from Louisville to Seattle.
  • From Seattle, you can fly to other cities within the U.S., like Los Angeles, San Francisco, Dallas, Houston, Phoenix, Chicago, New York City, Las Vegas, and Denver, or international destinations like London, Vancouver, Toronto, Tokyo, Dubai, Seoul, Beijing, Amsterdam, Frankfurt, and Mexico City.

Reviews of the top 5 airlines serving from Louisville to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Louisville to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Louisville to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
Alaska AirlinesOverall score based on 12535 reviews
8.1Boarding
7.0Entertainment
7.8Comfort
8.5Crew
7.0Food
Airline reviews

there was no entertainment available and only water/coffee/juice/soda

8.0 ExcellentAnonymous, Jun 2026
PHX - SEA
Read more Alaska Airlines reviews

there was no entertainment available and only water/coffee/juice/soda

Subject: Formal Complaint – Incompetent Service and Denied Boarding on Flight 1409 (CLSVJM – Dear Alaska Airlines Customer Relations, I am writing to file a formal complaint regarding my experience on Flight 1409 departing from Seattle on 6/13/26. As a physician and business owner who frequently coordinates group travel, this was one of the worst airline experiences I have encountered. Upon arrival, I was informed that my check-in boarding pass was not official, despite successfully obtaining it electronically through your website/app with no warnings or indications of issues. My electronic boarding pass was rejected, leading to cancellation/denial of boarding. The gate agent (an older woman) was unhelpful, claimed my name had been announced multiple times (which it had not—she did not even know my name correctly), and mistakenly boarded my traveling companion under my name. Additionally, an older blonde staff member nearly failed to return my passport, highlighting a clear lack of training on your check-in and boarding systems. This chaos forced me onto a later flight while my group waited in Canada, unable to check into our Airbnb or pick up rental cars (as I was the primary booker). The entire incident caused significant business disruption, stress, and additional expenses. I have flown Alaska Airlines previously but will not consider it again without resolution. I request: • Full reimbursement of any additional costs incurred. • Appropriate compensation (vouchers/miles) for the inconvenience and poor service. • Confirmation of corrective actions for Please respond within 7-10 business days. Sincerely, Dr. Chunwen Teng

Never had so many staff members be rude and disrespectful. I had a staff member sarcastically call me “girly” after making me wait 20 minutes to be seen by her. I was able to print my luggage tag and she told me I was too late to check luggage I said the system obviously disagrees. And you had me wait way too long while you asked every single passenger ahead of me about their Disney vacations. She wasted so much time to then say “girly your bag won’t make it on the plane” I’m not her girly I’m a full grown adult. She needs to learn a hell of a lot of respect

The agents were super helpful. I was traveling with my mother inlaw who needed whell chair assisstance. The help and accomodation from the checkin crew, to the boarding crew and inflight crew was excellent.

Completely full flight. Boarding was smooth, but people didn’t listen about use of overhead bins which is typical. We pre-purchased a snack which was tasty. Drinks were good and plentiful. Flight left late because previous flight was delayed.

Eva Airlines attendants were wonderful. I really enjoyed the hot meals. They always greeted me with a warm smile. I'm looking forward to flying back to the USA with them again!

Flight maintenance was on so that flight didn’t go able to fly out to Seattle and Inhad to get another flight,,

3 of the 4 legs of our trip the crews were awesome! 1 leg the trip attendants were rude & dismissive, didn't even greet us when boarding even though both myself & my husband said hello directly to them when we boarded.

Well organized boarding. Cabin crew were efficient and professional. Thoroughly enjoyed the flight.

The first flight was fine, great crew, but the plane was delayed 45 minutes to go to Seattle because of they were missing a ramp. That would make sense if the plane was actually at the gate. Not if we’re still waiting for a plane. After we landed we waited 30-45 minutes on the tarmac just to get off the plane. Alaska made me miss my connecting flight, wasting my time, and my money. I should honestly be reimbursed, but hey, when does the airline ever actually take accountability? Never.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Flight was delayed over 3 hours. Planes were dirty. Staff indifferent. And they serve vegan pretzels as snacks.

It was great. The gate staff were very helpful in Portland when my son forgot his rolling bag and had to go back to get it just in time to make it on the plane. We really appreciate that. Great job!

Airline is not very senior friendly. Flights are late, forcing us to run to the connecting flight. Food is awful. Wish they would go back to pretzels and peanuts. During flight, pressurization isn’t quite right and all of our ears get plugged. Everything is nickel and dime, charging for boarding, seat selection and legroom. While a screen at the desk in the gate area says check your roll on bag now for free due to space limitation, the employee at the desk will not check the bag without a $100 fee. Insane.

Kayak could’ve posted the correct gate number. Almost missed my flight.

Slow boarding, limited food and drink portions. Bad delays and turbulence

there were two flight attendants that were up front...that were the best! They get KUDOs for making my trip only fantastic. Tell them Jeff said that!

OKay. I sat in the back of the plane and it was really loud between babies and little kids, and adults who.like to talk a lot and loudly most of the flight.

Flight coming out of Buffalo was delayed, so we had to be rescheduled on another flight from Baltimore to Phoenix which means we had a long layover and got home 3.5 hours late. Shuttle to parking stopped at 10pm, so we had to pay for an Uber to the parking lot and got charged an extra day of parking since it was after midnight. Not the best experience. Long day!

Was fine, delayed and feels like southwest is always late

Horrible. Faucet in sink not working, wifi not working. Didn’t bring food or snacks

Flight was delayed before take off and at landing. Baggage took 20 minutes. Flight crew would not serve full soft drink and had to ask multiple times before receiving water.

From checking to boarding, it was a seamless experience. The service agents were so helpful. The flight crew was so pleasant.

Gate agent showed up 20 minutes before boarding and was not at all friendly. Had to take this flight due to the one on the day before being cancelled and any later options were already full with long standby lists. Despite having paid for Delta Comfort seats, Delta did not allow me (or anyone) to choose their seat. The agent assigned them for everyone just prior to boarding. Self seat selection was allowed on the original flight. Flight staff was great - very friendly.

Flight attendants were great. Cheerful, upbeat and friendly. Jet, in particular, was fantastic.

I have Precheck. Flew HPN to DEN and return this past weekend. Delta didn't attach my Precheck number to this trip. So it was waiting in general line especially in Denver. Unavailable.

Original flight was delayed, then cancelled and the gate staff did not expedite rebooking. Also, no instructions were given that a ticket number was needed before being called to facilitate rebooking. This could have been much more organized.

Be on time? When not on time a circling for over an hour offer more than 1 bag of chips to the passengers? It was a 7 hour flight by the time we got done.

Five hour delays every hour, I wish it were all at once

Flight delayed four separate times. I’m now one hour hours late to landing.

Very easy ! Use the kiosk and bag drop and right to security within 10 min

Checking bag at terminal was horrible. No agents to check us in and only 1 kiosk working. Boarding went ok. Crew onboard was very scattered rained. Missed our row while serving and then didn’t see them hardly again.

Crew was amazing, takeoff wonderful. The bathroom was disgusting from before takeoff the odor made the flight uncomfortable as you could smell the bathroom from the center of the plane where we were sitting. Smelled like raw sewage. My daughter was throwing up as we landed due to the smell and horrible turbulence as we approached Newark.

Airline tickets are not cheap. You expect reliable competent service. Thanks to canceled flights and botched transfers we arrived at our destination two days late. This is not acceptable

Horrible! Several delays and then was cancelled! I spent over 24 hours in the airport and was unable to get a hotel or food voucher.

The entertainment is a bit limited, it would be better if they added some games to play besides the movies and tv shows. But the seats are comfortable and the crew is polite

This planes staff was top tier. Everything went great and had a great flight home.

Food was great. Staff was phenomenal. Seats were a bit hard and could use a lot more entertainment options as far as movies to choose from. WiFi was good. Overall great trip.

This was an overnight flight, and in the morning they did know coffee service. How you can throw passengers in a San Francisco airport at 5:40 a.m. in the morning and not giving them Coffee is a crime.

Our flight was delayed several Times due to mechanical issues. Although I understand this may happen at times, it was very inconvenient and we had to book a hotel for an overnight stay. We were traveling with my 3-yo grandson and waiting at the airport from noon until 6:30pm with no reassurance that our next rescheduled flight would depart, we had to decide what’s best for him. A day later, I found out that I may be able to demand compensation if my flight is delayed more than 4 hours. I will hav to read the fine print next time.

Excellent service. Flight attendance like Jessica,, on our flight, is a reason I wouldn’t mind flying through British Airways again. Jessica,, was very courteous and helpful.

The seats were extremely cramped, with very little legroom or personal space. There was no room left in the overhead bins for a backpack, and the space under the seat in front was so limited that I could barely fit my bag underneath. Overall, the seating arrangement felt very uncomfortable and overcrowded.

Significant delays on my trip to Chicago and my trip back to NY

Terrible boarding and first class experience. Nice staff but overall disorganized, dirty plane.

Delayed by 5 hours and I had to wit in the airport for more than 6+ hours.

weather delay of almost 2 hours then we landed and our gate wasn't available so we waited another 30 min

Flight had mechanical issues and it was delayed 30 mins - some of us boarded and then had to deplane.

technology worked well and everything ran smoothly. The seats are quite cramped so please don't try to re-engineer the cabin to squeeze more bodies on board.

Delayed flight more than I hour. When boarding we spent some additional time on the plane before takeoff ....

Flight was delayed due to connecting passengers. Lack of snack options bad. Sitting in Aisle, last cart run pulled the cart directly into my knee. Rude awakening.

Everything you need to know for your flight from Louisville to Seattle

Information on your arrival and departure airports