$449 Cheap Aer Lingus flights Washington (IAD) to Edinburgh (EDI)

Use the "Price (lowest to highest)" filter on Expedia to search for cheap Aer Lingus round-trip flights from $585 from IAD to EDI. Affordable one-way fares from $449 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.

Landing the best Aer Lingus deals from IAD to EDI often comes down to booking at the right time. You can save 17% on international flights when you book 18 to 29 days before takeoff instead of four to five months ahead. Better still, you can pocket 17% on average by buying your fare on a Sunday compared to a Friday, which is often the most expensive day to book.* It's a good idea to start checking out flights 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.

Sort your results by "Early Morning" and "Morning" to browse the earliest departures from IAD to EDI. 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.

Offering a 4-star airline rating and a rewarding loyalty program, Aer Lingus is a popular option for many passengers heading from IAD to EDI. What's more, if you're an Aer Lingus AerClub and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which you can put toward future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.