$90 Cheap Flights from Washington (IAD) to Louisville (SDF)

View $90 flight on Sat, Aug 30, 2025Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)

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Cheap Flights from Washington to Louisville (IAD-SDF)

Prices were available within the past 7 days and start at $90 for one-way flights and $177 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Nov 4 - Sat, Nov 8
IAD
Washington
SDF
Louisville
$177 Roundtrip, found 8 hours ago
$177
Roundtrip
found 8 hours ago
Select United flight, departing Tue, Nov 4 from Washington to Louisville, returning Sat, Nov 8, priced at $177 found 8 hours ago
United
Thu, Oct 30 - Sat, Nov 1
IAD
Washington
SDF
Louisville
$183 Roundtrip, found 7 hours ago
$183
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Oct 30 from Washington to Louisville, returning Sat, Nov 1, priced at $183 found 7 hours ago
United
Thu, Oct 30 - Sat, Nov 1
IAD
Washington
SDF
Louisville
$188 Roundtrip, found 7 hours ago
$188
Roundtrip
found 7 hours ago
Select United flight, departing Thu, Oct 30 from Washington to Louisville, returning Sat, Nov 1, priced at $188 found 7 hours ago
United
Fri, Aug 22 - Mon, Aug 25
IAD
Washington
SDF
Louisville
$189 Roundtrip, found 10 hours ago
$189
Roundtrip
found 10 hours ago
Select United flight, departing Fri, Aug 22 from Washington to Louisville, returning Mon, Aug 25, priced at $189 found 10 hours ago
United
Tue, Nov 4 - Sat, Nov 8
IAD
Washington
SDF
Louisville
$193 Roundtrip, found 8 hours ago
$193
Roundtrip
found 8 hours ago
Select United flight, departing Tue, Nov 4 from Washington to Louisville, returning Sat, Nov 8, priced at $193 found 8 hours ago
United
Sat, Aug 16 - Mon, Aug 18
IAD
Washington
SDF
Louisville
$194 Roundtrip, found 5 hours ago
$194
Roundtrip
found 5 hours ago
Select United flight, departing Sat, Aug 16 from Washington to Louisville, returning Mon, Aug 18, priced at $194 found 5 hours ago
Delta
Sat, Sep 13 - Wed, Sep 17
IAD
Washington
SDF
Louisville
$197 Roundtrip, just found
$197
Roundtrip
just found
Select Delta flight, departing Sat, Sep 13 from Washington to Louisville, returning Wed, Sep 17, priced at $197 just found
Delta
Tue, Oct 28 - Fri, Oct 31
IAD
Washington
SDF
Louisville
$198 Roundtrip, found 7 hours ago
$198
Roundtrip
found 7 hours ago
Select Delta flight, departing Tue, Oct 28 from Washington to Louisville, returning Fri, Oct 31, priced at $198 found 7 hours ago
United
Thu, Aug 7 - Thu, Aug 14
IAD
Washington
SDF
Louisville
$198 Roundtrip, found 4 days ago
$198
Roundtrip
found 4 days ago
Select United flight, departing Thu, Aug 7 from Washington to Louisville, returning Thu, Aug 14, priced at $198 found 4 days ago
American Airlines
Sat, Sep 13 - Wed, Sep 17
IAD
Washington
SDF
Louisville
$225 Roundtrip, just found
$225
Roundtrip
just found
Select American Airlines flight, departing Sat, Sep 13 from Washington to Louisville, returning Wed, Sep 17, priced at $225 just found

Find the cheapest month to fly from Washington (IAD) to Louisville (SDF)

August is typically the cheapest month to fly

From $144 - $459 per traveler.

Graph displaying average flight prices per month

Alternative airports near Louisville

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

Select flight to Louisville Intl. SDF. Cheapest and Closest option available. Average driving time to city center is 9 minutes. Flights from $269
SDF
Louisville Intl.
CheapestClosest
Average driving time to city center9 min
Flights from $269
Flights from Washington (IAD) to Louisville (SDF)
Origin airport
Washington Dulles Intl.
Destination airport
Louisville Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$177
Distance
451 mi
Average flight time
1 hour 49 mins

Washington to Louisville Flights

The cheapest times to fly from Washington to Louisville

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 Washington to Louisville are during the month of November. You can find some of the cheapest flights from Washington to Louisville with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Louisville

Sunday is one of the best days to book for cheap flights from Washington to Louisville: 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 Washington to Louisville

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 Washington to Louisville in 2025. You can also book with separate airlines for your outbound and return journeys, from $90 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 Washington to Louisville 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 Washington to Louisville 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 Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF) cost?
Cheap round-trip flights from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF) start from $172. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a United flight leaving IAD on August 12 2025 and touching down at SDF. The price was last updated on July 23 2025 and has not changed since.
What is the cheapest month to fly from IAD to SDF?
The cheapest flights from IAD to SDF are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)?
If you're departing from Washington Dulles Intl. Airport (IAD), you can catch a direct flight to Louisville Intl. Airport (SDF) with United Airlines.
What is the cheapest airline that flies from IAD to SDF?
Currently, the cheapest airline operating one-way flights from IAD to SDF is United. You can take off on this route from $116. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from IAD on August 13 2025. Prices were last updated on July 23 2025 and have not changed since.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)?
When flying out of Washington Dulles Intl. Airport (IAD), you can pick from an average of 2 daily nonstop flights to Louisville Intl. Airport (SDF).
What are the most popular departure times for flights from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)?
The 5 PM departures from IAD to SDF are the busiest. These flights can come with a higher price due to their popularity. If you want to save on your fare, choose a less crowded time to fly.
What day of the week has the most flights from IAD to SDF?
Friday has the most flights from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF). Consider taking off on this day and you'll have the best chance of finding a departure that fits your itinerary.
What is the earliest flight from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)?
Washington Dulles Intl. Airport (IAD)'s first flight to Louisville Intl. Airport (SDF) leaves at approximately 12:45PM UTC-5. With a flight time of 1h 53m, you'll land at around 2:38PM UTC-5.
How long does it take to fly from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)?
It takes around 1 hour and 53 minutes to travel the 450 mi from IAD to SDF.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)?
To avoid possible delays on the Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF) route, aim to fly 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.
What airports do you fly into for Louisville from Washington Dulles Intl. Airport (IAD)?
Louisville Intl. Airport (SDF) is the only airport in Louisville with direct flights from Washington Dulles Intl. Airport (IAD). Consider the available options and find affordable fares on Expedia.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF) last-minute?
Booking your ticket from IAD to SDF right before your journey is generally more expensive. However, if you're flexible with your schedule, you could score a cheap last-minute fare.
Is it cheaper to book an IAD to SDF flight and hotel package?
You'll typically save money by securing an IAD to SDF flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. After selecting your preferred accommodations and flights, consider adding extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)?
In most instances, you can modify or cancel your IAD to SDF flight. However, additional fees may apply, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and guidelines on flight changes, or if you need more information, head to our Customer Service portal.

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