$90 Cheap United flights Washington (IAD) to Louisville (SDF)

Set the “Price (lowest to highest)” filter on Expedia to find cheap United Airlines return flights from $179 from IAD to SDF. Affordable one-way options from $90 are also available.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

January is one of the least expensive months to fly to Louisville with United Airlines. You could also find great deals on return and one-way fares in December.

To find cheap United Airlines fares from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF), start searching one to three months before your intended departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact what you pay. Sunday tends to be the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your trip on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

Yes, you can travel from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF) on one of United Airlines’s 14 direct weekly flights. Make use of our “Nonstop” and “Airline” filters to find the United Airlines flight that’ll get you to SDF at your preferred time.

Depart Washington Dulles Intl. Airport (IAD) for Louisville Intl. Airport (SDF) on a direct United Airlines flight, and you’ll be airborne for around 1h 53m.

United Airlines has the most flights from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF) on Thursday. With up to 2 daily departures, you’ll get the most options and flexibility on this day.

The first flight from IAD to SDF with United Airlines departs at 12:45PM UTC-5. You’ll touch down at 2:38PM UTC-5. The last United Airlines flight of the day takes off at 5:55PM UTC-5 and arrives at 7:48PM UTC-5. With approximately 20% fewer cancellations for departures before noon, setting off early is usually the best option.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

United Airlines flights from Washington Dulles Intl. Airport (IAD) to Louisville land at Louisville Intl. Airport (SDF). This is the main gateway to this city.

Travel from IAD to SDF with United Airlines and you can look forward to a range of benefits starting with a rewarding loyalty program. When you book through Expedia as a United Mileage Plus and One Key™ member, you may also earn OneKeyCash™* to use on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

You’ll most likely board an Embraer 175 for your United Airlines flight from Washington Dulles Intl. Airport (IAD) to Louisville Intl. Airport (SDF). However, you could be switched to another aircraft for operational reasons.

Depending on your fare type, a fee will generally apply if you cancel or reschedule your booking more than 24 hours after it has been confirmed. To secure flexible fares, select our “Changes included” and “No cancel fee” boxes while looking for flights. For more information on changing or canceling your reservation, go to “Trips,” select your flight and tick “Manage Booking.”