$1,622 Cheap Delta flights Cardiff (CWL) to Washington (IAD)

Make use of the “Price (lowest to highest)” filter on Expedia to look for cheap Delta Air Lines return flights from CWL to IAD. Affordable one-way fares from $1,622 are also on offer.**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.

Search for round-trip or one-way flights to Washington in January or February. You could find lower fares with Delta Air Lines during these off-peak travel months.

Getting the best Delta Air Lines deals from CWL to IAD often comes down to timing. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. What’s more, you can pocket 17% on average by buying your tickets on a Sunday compared to a Friday, which is usually the most expensive day to book.* It’s smart to kick off your flight search about one month before you plan to travel.*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.

Select our “Nonstop” filter when browsing for direct Delta Air Lines flights from CWL to IAD. You can also compare other carriers servicing the same direct trip.

Filter your results by “Early Morning” and “Morning” to browse the earliest departures from CWL to IAD. Heading off early means flight cancellations are less likely.**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.

Washington Dulles Intl. Airport (IAD) is the primary Washington gateway for Delta Air Lines flights from Cardiff Intl. Airport (CWL).

Delta Air Lines makes traveling from CWL to IAD enjoyable with a rewarding loyalty program and an excellent in-flight experience. You also have the chance to earn points with Delta SkyMiles. Be sure to join Expedia’s free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the type of fare you purchased, a fee generally applies if you change or cancel your booking more than 24 hours after it has been confirmed. To find tickets with more flexibility, select our “No cancel fee” or “Changes included” filter while looking for flights. For additional information on changing or canceling your reservation, head to “Trips,” select your flight and tick “Manage Booking.”