$229 Cheap Icelandair flights Washington (IAD) to London (LGW)

You can find affordable round-trip Icelandair flights from $484 from IAD to LGW by sorting your results from “Price (lowest to highest)” on Expedia. Or search for options from $229 for a one-way journey.**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.

Browse for one-way or round-trip flights to London in January or February. You could find a cheap fare with Icelandair during these quieter months.

Landing the best Icelandair deals from IAD to LGW 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. As an added bonus, 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 your travel dates.*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.

Use the “Nonstop” filter when browsing for direct Icelandair flights from IAD to LGW. It’s also an easy way to compare other carriers offering the same nonstop journey.

Filter your results by “Morning” and “Early Morning” to find the earliest departures from IAD to LGW. Jetting off early means you’re 20% less likely to experience cancellations.**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.

Gatwick Airport (LGW) is the main London hub for Icelandair flights from Washington Dulles Intl. Airport (IAD).

On Icelandair, you can fly standard economy from IAD to LGW with a small personal item and 1 cabin bag. Your carry-on bag should be no bigger than 21 inches x 7 inches x 13 inches and weigh under 13 lb. Going over these restrictions may lead to additional charges, so read your airline’s latest guidelines before confirming your booking.

Offering a rewarding loyalty program and top-tier customer service, Icelandair is a favorite for many passengers flying from IAD to LGW. Also, if you’re an Icelandair Saga Club and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be put toward future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on your fare type, a fee will generally apply if you cancel or change your flight more than 24 hours after it’s confirmed. To find flexible fares, select our “No cancel fee” or “Changes included” filter while searching for flights. For more details on changing or canceling your reservation, head to “Trips,” select your flight and tick “Manage Booking.”