$182 Cheap Flights from Louisville (SDF) to Seattle (SEA)
Popular airlines from Louisville Intl. Airport (SDF) to Seattle-Tacoma International Airport (SEA)
Alaska AirlinesAlaska Airlines
DeltaDelta
American AirlinesAmerican Airlines
UnitedUnited
Southwest AirlinesSouthwest Airlines
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Cheap Flights from Louisville to Seattle (SDF-SEA)
Alternative airports near Seattle
Prices were available within the past 7 days. Prices and availability are subject to change.
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Louisville (SDF) to Seattle (SEA) at a glance
Travel between Louisville (SDF) and Seattle (SEA) with a variety of airlines offering convenient options for this domestic short-haul route. Discover a range of Seattle flights, including both full-service and budget carriers, to find the best itinerary that aligns with your travel plans and budget. Whether you're seeking cheap flights from Louisville or simply want to explore Seattle's iconic attractions and neighborhoods, key details for flights from Louisville International Airport to Seattle-Tacoma International Airport are readily available.
- Fastest flight duration: around 6h 30m in-flight, plus roughly 1h 15m layover with one stop
- Route distance: roughly 1,900 miles (3,060 km)
- Flights per week: around 15+ flights with multiple daily departures on average
- Typical fares (one-way): economy tickets often range from $135–$505, depending on seasonality and how far ahead you book
Flights from Louisville International Airport (SDF) to Seattle - Tacoma International Airport (SEA)
According to recent traveler bookings, the top airlines flying from Louisville to Seattle are favored for their one-stop services. Common layover locations include O'Hare International Airport (ORD) with a layover of about 1 hour and 15 minutes, Dallas-Fort Worth International Airport (DFW) at around 1 hour, and Denver International Airport (DEN) with a 1 hour and 30 minute layover. This variety allows you to compare prices, total travel times, and cabin classes to create your ideal itinerary.
- American Airlines: This full-service carrier provides one-stop flights, with one-way ticket prices generally falling between $135 and $535. It represents about 39% of departures on this route, featuring an in-flight duration of 6 hours 30 minutes and a total travel time of approximately 7 hours 45 minutes, including layover.
- United: As a full-service airline, United offers one-stop travel with one-way fares typically ranging from $155 to $535. It accounts for around 23% of all departures on this route, with a flight time of 6 hours 30 minutes and an overall journey time of about 7 hours 45 minutes, factoring in a layover.
- Delta: Delta is a full-service carrier providing one-stop services, with one-way fares usually between $135 and $625. It accounts for approximately 20% of departures along this route, featuring a flight time of 6 hours 30 minutes and a total travel duration of roughly 7 hours 45 minutes, including a layover.
- Southwest Airlines: This low-cost airline offers one-stop service with one-way fares generally between $135 and $510. It makes up about 15% of departures on this route, with an in-flight time of 6 hours 30 minutes and an overall journey time of around 7 hours 45 minutes, including layover.
- Alaska Airlines: A full-service carrier, Alaska Airlines provides one-stop flights with one-way fares typically ranging from $255 to $535. This airline accounts for about 4% of departures on this route, featuring a flight duration of 6 hours 30 minutes and a total travel time of approximately 7 hours 45 minutes, including layover.
Travelers flying from Louisville to Seattle have the option to enhance their experience by upgrading their flight. American Airlines offers first-class service, while Delta provides both first class and premium economy class. United also features first-class seating for a more comfortable journey.
Best time to fly from Louisville (SDF) to Seattle (SEA)
The most popular months for travelers flying from Louisville to Seattle are April, June, and September, when peak temperatures in Seattle reach up to 61.3°F in September. If you prefer quieter travel, consider February, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 40.5°F. For better deals, September usually offers the lowest average one-way fare around $255. Flight availability peaks in June and September, with approximately 26 flights per week, making it easier to find convenient departure times.
- Cheapest time to fly: September usually offers good deals with average one-way fare around $255, roughly 12% cheaper than the yearly average.
- More budget-friendly months to fly: October, August, and February typically offer average one-way fares of around $261.
- Most flight options: June and September have the highest number of flights from Louisville to Seattle, with approximately 26 flights per week, giving you more flexibility in scheduling your trip.
| Month | Temperature | Demand | Weekly Flights | Average one-way Fare |
| January | 40.3°F (4.6°C) | Average | 14 | $292 |
| February | 40.5°F (4.7°C) | Moderately Low | 12 | $264 |
| March | 43.9°F (6.6°C) | Average | 16 | $322 |
| April | 48.6°F (9.2°C) | Moderately High | 15 | $301 |
| May | 55.8°F (13.2°C) | Average | 18 | $303 |
| June | 61.0°F (16.1°C) | Moderately High | 26 | $305 |
| July | 67.1°F (19.5°C) | Average | 25 | $295 |
| August | 67.5°F (19.7°C) | Average | 19 | $261 |
| September | 61.3°F (16.3°C) | Moderately High | 26 | $255 |
| October | 52.7°F (11.5°C) | Average | 17 | $258 |
| November | 44.2°F (6.8°C) | Moderately Low | 15 | $289 |
| December | 39.2°F (4.0°C) | Moderately Low | 14 | $352 |
*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.
Alternative routes from Louisville (SDF) to Seattle (SEA)
- Louisville to Renton (SDF-RNT): Renton Municipal Airport (RNT) is located approximately 5 miles from Seattle - Tacoma International Airport (SEA), providing convenient access to the Seattle area.
- Louisville to Seattle (SDF-BFI): Boeing Field Airport (BFI) lies roughly 6 miles from Seattle - Tacoma International Airport (SEA), making it a viable option for travelers heading to Seattle.
- Louisville to Seattle (SDF-LKE): Lake Union Seaplane Base Airport (LKE) is about 13 miles away from Seattle - Tacoma International Airport (SEA), offering a scenic alternative for reaching the city.
How to find the best prices for flights from Louisville (SDF) to Seattle (SEA)
Getting some of the best deals on flights from Louisville to Seattle is all about timing and flexibility. Here are some key tips to help you save:
- Best times to book and fly: cheaper fares are usually found when booking at least two months in advance, although most travelers tend to book 2 to 8 weeks ahead. Afternoon departures from 12 PM to 6 PM often offer lower prices, while morning flights from 5 AM to 12 PM are the most popular. Additionally, flying on Tuesday generally provides better deals, although Sunday is the busiest travel day.
- Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
- Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
- Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
- Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
- Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.
*Members only. Savings vary and are not available on all bundles. Select hotels.
Arriving at Seattle - Tacoma International Airport from Louisville International Airport
Seattle welcomes travelers from Louisville with a range of transport options based on price, convenience, and proximity. Seattle city center is approximately a 20-minute drive (covering about 14 miles) from Seattle - Tacoma International Airport, depending on traffic. Here's how to reach Seattle efficiently:
- Hotel transfer: Transfers offer a convenient way to reach your hotel in Seattle, with private rides that can be arranged in advance.
- Car rental: Renting a car from Seattle - Tacoma International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Seattle - Tacoma International Airport on Expedia.
- Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
- Public transportation: From Seattle - Tacoma International Airport, SeaTac/Airport Station, a metro station, is located about 0.3 miles away on foot, while Tukwila Station, a train station, is situated about 4.3 miles away by car, providing convenient access to public transport options for travelers.
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 2026. You can also book with separate airlines for your outbound and return journeys, from $182 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, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
You can find cheap one-way flights from $182 and cheap return flights $347 Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) with Expedia. One-way flights generally range between $175 and $1407, and roundtrip flights usually range from $382 to $1326. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) ticket fares go up or down.
*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The cheapest month to fly from SDF to SEA is December when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Enter SDF to SEA and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Sun Country Airlines is one of the cheapest airlines offering connecting flights from Louisville, KY (SDF) to Seattle, WA (SEA) with a layover in Minneapolis (MSP), starting from around $363 for a round-trip ticket. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
To find a cheap flight from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from Louisville (Louisville Intl.) to Seattle (Seattle - Tacoma Intl.) typically departs at around 5:00 AM, operated by American Airlines. This seasonal service is available in March and April, allowing you to start your day early in Seattle. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The most popular departure times for flights from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) are in the early morning, from 6am to 9am. About 36% of passengers prefer this time window. Many major carriers, including American Airlines, Delta and United Airlines, offer flights during this window. This timing works well because it allows you to start your day early and arrive in Seattle with plenty of time to explore.
How long does it take to fly from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
A flight from SDF to SEA with a layover takes around 7 hours 50 minutes, with the route covering approximately 1,940 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
First class is available on flights from SDF to SEA. First class cabins are available on:
- United Airlines
- Delta Air Lines
- American Airlines
How do I earn miles on a Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight with Expedia?
It's easy to earn miles on a Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.
*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Seattle from Louisville Intl. (SDF)?
If you're planning to travel to Seattle from Louisville Intl. (SDF), you can fly into Seattle - Tacoma Intl. (SEA) Some flights may connect through major hubs like O'Hare Intl. (ORD), Midway Intl. (MDW), Denver Intl. (DEN) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) at the last minute?
Typically, booking a last minute flight from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package?
Securing a Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) Seattle Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
If you booked your Louisville, KY (SDF-Louisville Intl.) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.
Travel information
Origin airport | Louisville Intl. Airport |
|---|---|
Destination airport | Seattle-Tacoma International Airport |
Distance | 1,939 miles away |
Airlines serving | Alaska Airlines, Delta, American Airlines, United, Southwest Airlines |
Popular airline | Alaska Airlines |
Roundtrip price | $347 |