$149 Cheap Flights from Washington (IAD) to Louisville (SDF)

View $149 flight on Tue, Mar 17, 2026Opens 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 $149 for one-way flights and $189 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Feb 7 - Tue, Feb 10
IAD
Washington
SDF
Louisville
$189 Roundtrip, found 2 hours ago
$189
Roundtrip
found 2 hours ago
Select United flight, departing Sat, Feb 7 from Washington to Louisville, returning Tue, Feb 10, priced at $189 found 2 hours ago
United
Sat, Jan 3 - Thu, Jan 8
IAD
Washington
SDF
Louisville
$196 Roundtrip, found 2 days ago
$196
Roundtrip
found 2 days ago
Select United flight, departing Sat, Jan 3 from Washington to Louisville, returning Thu, Jan 8, priced at $196 found 2 days ago
United
Fri, Feb 27 - Mon, Mar 2
IAD
Washington
SDF
Louisville
$201 Roundtrip, found 10 hours ago
$201
Roundtrip
found 10 hours ago
Select United flight, departing Fri, Feb 27 from Washington to Louisville, returning Mon, Mar 2, priced at $201 found 10 hours ago
Delta
Tue, Mar 17 - Sat, Mar 21
IAD
Washington
SDF
Louisville
$209 Roundtrip, just found
$209
Roundtrip
just found
Select Delta flight, departing Tue, Mar 17 from Washington to Louisville, returning Sat, Mar 21, priced at $209 just found
United
Fri, Feb 27 - Mon, Mar 2
IAD
Washington
SDF
Louisville
$215 Roundtrip, found 10 hours ago
$215
Roundtrip
found 10 hours ago
Select United flight, departing Fri, Feb 27 from Washington to Louisville, returning Mon, Mar 2, priced at $215 found 10 hours ago
United
Tue, Dec 30 - Thu, Jan 1
IAD
Washington
SDF
Louisville
$216 Roundtrip, found 4 days ago
$216
Roundtrip
found 4 days ago
Select United flight, departing Tue, Dec 30 from Washington to Louisville, returning Thu, Jan 1, priced at $216 found 4 days ago
United
Wed, Dec 31 - Fri, Jan 2
IAD
Washington
SDF
Louisville
$219 Roundtrip, found 1 hour ago
$219
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Dec 31 from Washington to Louisville, returning Fri, Jan 2, priced at $219 found 1 hour ago
United
Fri, Jan 16 - Mon, Jan 19
IAD
Washington
SDF
Louisville
$221 Roundtrip, found 10 hours ago
$221
Roundtrip
found 10 hours ago
Select United flight, departing Fri, Jan 16 from Washington to Louisville, returning Mon, Jan 19, priced at $221 found 10 hours ago
United
Fri, Jan 16 - Sun, Jan 18
IAD
Washington
SDF
Louisville
$223 Roundtrip, found 11 hours ago
$223
Roundtrip
found 11 hours ago
Select United flight, departing Fri, Jan 16 from Washington to Louisville, returning Sun, Jan 18, priced at $223 found 11 hours ago
American Airlines
Sat, Jan 31 - Wed, Feb 4
IAD
Washington
SDF
Louisville
$259 Roundtrip, found 1 hour ago
$259
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Sat, Jan 31 from Washington to Louisville, returning Wed, Feb 4, priced at $259 found 1 hour ago

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

August is typically the cheapest month to fly

From $137 - $322 per traveler.

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 $219
SDF
Louisville Intl.
CheapestClosest
Average driving time to city center9 min
Flights from $219
Flights from Washington (IAD) to Louisville (SDF)
Origin airport
Washington Dulles Intl.
Destination airport
Louisville Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$189
Distance
451 mi
Average flight time
1 hour 56 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 February. 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 2026. You can also book with separate airlines for your outbound and return journeys, from $149 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?
Lock in a cheap one-way flight from $149 or cheap return flight from $189 from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF) 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 Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)?
The cheapest month to fly from IAD to SDF is February, when there's less demand. Off-peak season is usually when better flight deals are available between these airports.
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 Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF)?
Use the filters on Expedia to compare different airlines and find the cheapest carrier that'll take you from IAD to SDF. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
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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*Available to One Key members.