IAD - SDF

$121 Find Cheap Flights from Washington Dulles Airport to Louisville - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Louisville departing on 9/26. 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

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Everything you should know

Cheapest round-trip
$235
Typical prices: $309-$364
United Airlines
Thu 8/20Sun 8/23
IAD - SDF • Non-stop
Cheapest one-way
$121
Typical prices: $178-$346
Multiple Airlines
Sat 9/26
IAD - SDF • 1 stop
Top airlines
Cheapest • from $235 (round-trip)
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with United Airlines. Average duration is 1h 49m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
When to book
in advance
Our data shows that travelers who book at least 6 weeks in advance save around 43% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 29% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
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Start a new search
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We hope you love your trip to Louisville!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Dulles Intl to Louisville (IAD-SDF)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl to Louisville 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 Dulles Intl to Louisville

Thu, Aug 20 - Sun, Aug 23
United Airlines Logo
8:35 am - 10:18 am
IAD
-
SDF
1h 43mnonstop
United Airlines Logo
6:00 am - 7:35 am
SDF
-
IAD
1h 35mnonstop
$235United Airlines
Thu, Aug 20 - Sun, Aug 23
United Airlines Logo
8:35 am - 10:18 am
IAD
-
SDF
1h 43mnonstop
United Airlines Logo
10:05 am - 11:47 am
SDF
-
IAD
1h 42mnonstop
$235United Airlines
Wed, Nov 11 - Sun, Nov 15
Delta Logo
5:00 pm - 12:05 am
IAD
-
SDF
7h 05m
1 stop
Delta Logo
7:00 am - 11:35 am
SDF
-
IAD
4h 35m
1 stop
$235Delta
Fri, Aug 21 - Wed, Aug 26
Delta Logo
8:28 am - 12:21 pm
IAD
-
SDF
3h 53m
1 stop
Delta Logo
11:17 am - 4:42 pm
SDF
-
IAD
5h 25m
1 stop
$235Delta
Thu, Nov 5 - Sun, Nov 8
Delta Logo
6:05 am - 9:57 am
IAD
-
SDF
3h 52m
1 stop
Delta Logo
7:05 am - 11:32 am
SDF
-
IAD
4h 27m
1 stop
$235Delta
Sat, Aug 29 - Wed, Sep 2
United Airlines Logo
5:25 pm - 7:15 pm
IAD
-
SDF
1h 50mnonstop
United Airlines Logo
1:56 pm - 3:34 pm
SDF
-
IAD
1h 38mnonstop
$241United Airlines
Thu, Aug 20 - Mon, Aug 24
United Airlines Logo
5:25 pm - 7:15 pm
IAD
-
SDF
1h 50mnonstop
United Airlines Logo
1:56 pm - 3:34 pm
SDF
-
IAD
1h 38mnonstop
$241United Airlines
Thu, Aug 13 - Mon, Aug 17
Multiple Airlines Logo
8:25 am - 6:15 pm
IAD
-
SDF
9h 50m
2 stops
Multiple Airlines Logo
9:10 pm - 7:44 pm
SDF
-
IAD
22h 34m
1 stop
$268Multiple Airlines
Thu, Aug 20 - Sun, Aug 23
Multiple Airlines Logo
6:09 pm - 9:49 am
IAD
-
SDF
15h 40m
1 stop
Multiple Airlines Logo
6:55 pm - 4:13 pm
SDF
-
IAD
21h 18m
2 stops
$268Multiple Airlines
Thu, Oct 29 - Mon, Nov 2
Multiple Airlines Logo
5:25 pm - 9:45 am
IAD
-
SDF
16h 20m
2 stops
Multiple Airlines Logo
7:08 pm - 8:21 pm
SDF
-
IAD
25h 13m
1 stop
$273Multiple Airlines
Booking Insights

KAYAK's insights & trends for Dulles Intl to Louisville flights

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

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Louisville?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to Louisville departing in August.

Flight prices are below average for this route right now.

Flights to Louisville from Washington, D.C. Dulles Intl Airport usually cost between $309 and $364 in August.
The lowest price found in the past 5 days was $235 on United Airlines (Aug 20-Aug 23).

What’s the cheapest day of the week to fly from Washington Dulles Airport to Louisville?

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to Louisville clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Louisville on a Saturday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Washington Dulles Airport to Louisville. For your return ticket, we recommend flying on a Friday and avoiding Mondays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Louisville, 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 Washington, D.C. Dulles Intl Airport to Louisville is January, where tickets cost $249 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is $464 and $459 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport to Louisville, 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 Washington, D.C. Dulles Intl Airport to Louisville, you should book around 6 weeks before departure, which saves you about 43% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Good to know

Low season

June

Cheapest flight

$121
Best time to beat the crowds but there is an average 31% increase in price.
Most popular time to fly with an average 32% increase in price.
Flight from Washington Dulles Airport to Louisville

When to book flights from Dulles Intl to Louisville

Are your dates flexible? Find out the best times to travel from Dulles Intl to Louisville 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 Washington Dulles Airport to Louisville flights

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

    In the last 5 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Louisville was $121 for a one-way ticket and $235 for a round-trip.

  • Do I need a passport to fly between Washington Dulles Airport and Louisville?

    A passport is not required to fly from Washington Dulles Airport to Louisville.

  • Which airports will I be using when flying from Washington Dulles Airport to Louisville?

    Washington Dulles Airport and Louisville are both served by 1 main airport. You will leave Washington Dulles Airport from Washington, D.C. Dulles Intl and will be arriving at Louisville Intl.

  • Which airlines offer Wi-Fi service onboard planes from Washington Dulles Airport to Louisville?

    American Airlines, Delta, and JetBlue offer inflight Wi-Fi service on the Washington Dulles Airport to Louisville flight route.

  • Which aircraft models fly most regularly from Washington Dulles Airport to Louisville?

    The Embraer 175 (Enhanced Winglets) is the aircraft model that flies most regularly on the Washington Dulles Airport to Louisville flight route.

  • Which airline alliances offer flights from Washington Dulles Airport to Louisville?

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

  • On which days can I fly direct from Washington Dulles Airport to Louisville?

    There are nonstop flights from Washington Dulles Airport to Louisville on a daily basis.

  • Which is the best airline for flights from Washington, D.C. to Louisville, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Louisville are Delta and United Airlines. With an average price for the route of $358 and an overall rating of 7.8, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $337 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport to Louisville?

    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 Washington Dulles Airport to Louisville.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Louisville from Washington Dulles Airport 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 Washington Dulles Airport to Louisville?

    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 Louisville with an airline and back to Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport and SDF 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 Washington Dulles Airport to Louisville?

    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 Louisville from Washington Dulles Airport 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 Washington, D.C. Dulles Intl Airport to Louisville

  • Looking for a cheap flight? 25% of our users found flights on this route for $277 or less one-way and $277 or less round-trip.

Prefer to fly direct from Washington Dulles Airport to Louisville?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Washington, D.C. Dulles Intl to Louisville Intl.
Find which airlines fly direct from Washington, D.C. Dulles Intl Airport to Louisville Intl Airport, which days they fly and book direct flights.

Direct departures

Washington, D.C. Dulles Intl to Louisville Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

Louisville Intl to Washington, D.C. Dulles Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Reviews of the top airlines flying from Dulles Intl to Louisville

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Louisville. 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 Dulles Intl to Louisville? 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.
7.8
DeltaOverall score based on 8486 reviews
7.2Food
7.8Comfort
8.5Crew
7.8Entertainment
8.1Boarding
Airline reviews

Flight was delayed for about an hour but overall good experience

8.0 ExcellentNana, Jul 2026
DCA - ATL
Read more Delta reviews

Flight was delayed for about an hour but overall good experience

The gentleman at the gate I think his name is RIE was exceptional

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

2 of the seats in row 31 the entertainment system was not working, and one seat the tray table did not go all the way down. Flight arrived early and departed on time which was great.

Waited at the usual crowded gate at DCA where one ends up standing up because there aren't enough seats.

Lady Pilot was perfect in every way wheels up to wheels down communication, professionalism, excellent on time departure and on time arrival, excellent communication! Fantastic job with Superb attitude!!

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

Inexpensive, got an exit row aisle aeat with no middle passenger, bought a great breakfast sandwich, flight comfortable & arrived ahead of schedule.

I wouldn't say I liked being forced to check my small roller bag at the gate; too many people had bags and were in a higher boarding group.

715PM departure was 2.5 hours late. Received hotel & food voucher but after we already booked a room. Entire team just seemed like they were 2-3 steps behind in execution, and notifcations.

My flight was delayed so bad i missed u it so i just said never mind

Delayed 2 hours while stuck on the aircraft. If the luggage was properly loaded the first time we probably wouldn’t have been delayed at all

Onboard staff was courteous, helpful, responsive and friendly. The boarding process was disorganized, poorly communicated, and disheveled. Gate agents were yelling instead of using the PA system, didn’t communicate the timing delay of our flight, and created an atmosphere of chaos rather than order and communication. As far as I know, there was no reason for their. I would hate to see how it operated under extreme conditions. I’ve never seen United Airlines operations in such a state.

The flight did not have its customary snacks during the flight. Apparently they were never loaded on the plane.

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Short flight, but no drink/snack service. The flights both going and coming were delayed.

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

Everything you need to know for your flight from Dulles Intl to Louisville

Information on your arrival and departure airports