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$114+ Cheap flights from Dulles Intl (IAD) to Louisville (SDF)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SDF
Sep 6 — Sep 131
Sun 9/6
Sun 9/13
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Louisville Intl are usually found in January or December, booked 65 days in advance, depart on a Saturday or Wednesday and return on a Friday

Cheap flight deals from Dulles Intl to Louisville

Cheapest flights from Dulles Intl to Louisville
Explore the most affordable flight options available from Dulles Intl to Louisville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 7, 2026.

This Delta deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:07 pm -
1 stop5h 52m
Mon 9/143:43 pm -
1 stop6h 01m
Deal found 8/4$237
This United Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:35 am -
Nonstop1h 43m
Sun 8/306:00 am -
Nonstop1h 35m
Deal found 8/5$243
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:09 pm -
1 stop15h 40m
Mon 8/3111:19 am -
1 stop8h 25m
Deal found 8/3$246
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/68:03 am -
1 stop4h 51m
Tue 10/135:59 pm -
1 stop6h 43m
Deal found 8/5$247
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/512:28 pm -
1 stop22h 04m
Thu 9/109:09 pm -
2 stops27h 01m
Deal found 8/3$252
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/412:30 pm -
1 stop7h 00m
Sun 9/66:00 am -
1 stop4h 04m
Deal found 8/5$253
This Kiwi.com deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/38:25 am -
2 stops9h 50m
Thu 9/109:09 pm -
1 stop15h 54m
Deal found 8/4$257
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:25 pm -
Nonstop1h 50m
Thu 8/271:56 pm -
Nonstop1h 38m
Deal found 8/3$258
This United Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/305:35 pm -
Nonstop1h 55m
Sun 11/16:00 am -
Nonstop1h 35m
Deal found 8/4$259
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:50 pm -
2 stops20h 55m
Thu 11/52:50 pm -
1 stop26h 04m
Deal found 8/2$260
This Delta deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:28 am -
1 stop3h 53m
Mon 8/315:25 pm -
1 stop6h 01m
Deal found 8/4$263
This Kiwi.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:13 pm -
1 stop16h 22m
Thu 9/249:09 pm -
2 stops27h 01m
Deal found 8/3$266

Find flight deals from Dulles Intl to Louisville

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Louisville (SDF). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 7, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$237
(Delta)

One-way from

$114
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$333

Good round-trip deal

$289 or less

Good one-way deal

$277 or less
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Louisville Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Louisville Intl flights.
Search Deals
From Washington, D.C. Dulles Intl to Louisville Intl
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Louisville Intl
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($72 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Louisville Intl.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Louisville Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Louisville that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 7, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Louisville that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Wed 10/28

12:29 pm-7:10 pm

1 stop6h 41m

Louisville Intl

Tue 11/3

8:05 am-2:09 pm

1 stop6h 04m

$247

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Thu 11/5

6:05 am-9:57 am

1 stop3h 52m

Louisville Intl

Sun 11/8

7:05 am-11:32 am

1 stop4h 27m

$263

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Fri 9/11

8:08 am-2:58 pm

1 stop6h 50m

Louisville Intl

Mon 9/14

5:50 pm-11:14 pm

1 stop5h 24m

$263

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Fri 8/28

5:25 pm-7:15 pm

Nonstop1h 50m

Louisville Intl

Mon 8/31

1:56 pm-3:34 pm

Nonstop1h 38m

$313
Quickest round-trip

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Thu 10/15

8:35 am-10:18 am

Nonstop1h 43m

Louisville Intl

Sun 10/18

6:00 am-7:35 am

Nonstop1h 35m

$313

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Thu 11/5

8:37 am-10:34 am

Nonstop1h 57m

Louisville Intl

Sun 11/8

6:00 am-7:35 am

Nonstop1h 35m

$313

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Fri 10/2

12:55 pm-2:39 pm

Nonstop1h 44m

Louisville Intl

Mon 10/5

6:00 am-7:35 am

Nonstop1h 35m

$313

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Fri 9/4

5:25 pm-7:15 pm

Nonstop1h 50m

Louisville Intl

Wed 9/9

1:56 pm-3:34 pm

Nonstop1h 38m

$313

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Wed 9/16

8:20 am-1:08 pm

1 stop4h 48m

Louisville Intl

Wed 9/23

10:05 am-11:47 am

Nonstop1h 42m

$316

Washington, D.C.Louisville

IAD Washington, D.C. Dulles Intl - SDF Louisville Intl

IADSDF

Washington, D.C. Dulles Intl

Sat 9/19

6:25 pm-8:09 pm

Nonstop1h 44m

Louisville Intl

Sun 9/20

7:10 am-11:49 am

1 stop4h 39m

$316

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/5

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Dulles Intl to Louisville

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Louisville in August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Louisville flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Louisville flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Louisville flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Louisville flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-Louisville flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Dulles Intl to Louisville

Have a flexible travel schedule? Discover the best time to fly to Louisville from Dulles Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Louisville

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Louisville?

The price you pay for your flight from Washington, D.C. Dulles Intl Airport to Louisville may vary depending on when you book. For the best chance of a lower fare, look to book 35 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Louisville?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Louisville (average of $249). Flying from Washington, D.C. Dulles Intl Airport to Louisville in June is currently the most expensive (average of $459). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IAD to SDF?

Find hourly flight availability from Dulles Intl to Louisville. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 7, 2026.

One of the essential ways to save on airfare from Washington, D.C. Dulles Intl Airport to Louisville is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 11% on airfare.

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Louisville?

Airfare is below average for this route at the moment.

Washington, D.C. Dulles Intl Airport to Louisville flights typically cost between $309 and $378 in September.
The cheapest round-trip price found within the last 5 days was $237 on Delta (Sep 11-Sep 14).

Reviews of airlines servicing Louisville

Get insights into the airlines that provide service to Louisville. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Louisville. Reviews last updated August 7, 2026.
Read reviews from past customers who have flown Delta and United Airlines from Washington, D.C. Dulles Intl Airport to Louisville. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,503 reviews

Overall

7.8

Entertainment

7.8

Food

7.2

Boarding

8.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.8
Good
8,503 reviews
Delta
7.8
Good
8,503 reviews

Overall

7.8

Entertainment

7.8

Food

7.2

Boarding

8.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
10,077 reviews
Delta
7.8
Good
8,503 reviews

Overall

7.8

Entertainment

7.8

Food

7.2

Boarding

8.1

Crew

8.5

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Louisville. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Louisville from Washington, D.C. Dulles Intl?

    Louisville Intl (SDF) is the airport you will fly into if you book a flight from Washington, D.C. Dulles Intl to Louisville. You should not have trouble finding flights to Louisville Intl from Washington, D.C. Dulles Intl; the airport handles an average of 5 inbound flights from Washington, D.C. Dulles Intl per day. You should also have plenty of airline options to choose from since 2 airlines have flights to the Louisville airport from Washington, D.C. Dulles Intl. It is only a 5.3 mi journey from Louisville Intl (SDF) to Louisville’s city center.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Louisville?

    A quick flight from Washington, D.C. Dulles Intl Airport to Louisville can take about 1h 50m. Delta provides one of the quickest options available for as low as $313. Washington, D.C. Dulles Intl Airport and Louisville are separated by a distance of 450 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Louisville round-trip?

    According to our current data, United Airlines ($189), and Delta ($208) offers the cheapest pricing from Washington, D.C. Dulles Intl Airport to Louisville. You may be able to fly from Washington, D.C. Dulles Intl Airport to Louisville for 45% less than the average price by searching for these airlines.

  • What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Louisville?

    The top 3 most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Louisville are Copa Airlines (82%), Republic Airways (81%) and United Airlines (81%).

  • What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Louisville?

    Looking at all options, your cheapest flight can be booked for $243. While the most popular route (Washington, D.C. Dulles Intl - Louisville Intl) can be booked for $227 on average, our data indicates $368 when flying from Washington, D.C. Dulles Intl Airport to Louisville.

  • Can I find deals for flights from Dulles Intl to Louisville that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Louisville flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Louisville?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Louisville.

  • Can I find deals for business class flights from Dulles Intl to Louisville?

    Yes. Cheapflights offers flight deals from Dulles Intl to Louisville by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Louisville?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Louisville (average of $249). Flying from Washington, D.C. Dulles Intl Airport to Louisville in June is currently the most expensive (average of $459). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Louisville?

Book flights to Louisville if you plan to visit one of these locations
Corydon
Shepherdsville
Elizabethtown
Jeffersonville
Bardstown

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Dulles Intl to Louisville

Discover the top 2 airlines that operate flights from Dulles Intl to Louisville. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 7, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$189Average$341FlexibilityNo cancel feeOn-time69%
DeltaCheapest$208Average$347FlexibilityNo cancel feeOn-timeN/A

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