$384 Cheap American Airlines flights Washington (IAD) to London (LHR)

Finding cheap one-way American Airlines flights from IAD to LHR from $384 on Expedia is simple — just filter by “Price (lowest to highest).” Alternatively, check out our budget-friendly return fares from $396 for your next exciting getaway.**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.

American Airlines flights to London are usually more affordable in the quieter months of January and February. Whether you’re searching for a one-way or a return ticket, you could land a better deal then.

To discover cheap flights from IAD to LHR with American Airlines, begin your search about one month before your intended departure. You can save 17% when you book your international tickets 18 to 29 days ahead instead of booking four to five months in advance. Another good tip? Booking on Sunday offers average savings of 17% compared to Friday (the most expensive day).**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.

To find out if there’s a direct journey from IAD to LHR with American Airlines or other carriers, check the “Nonstop” box when browsing for tickets.

Search American Airlines’s earliest flights from IAD to LHR by selecting the “Morning” and “Early Morning” filters. Not only will you get to where you’re going sooner, early departures are also 20% less likely to be canceled.**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.

American Airlines flights from Washington Dulles Intl. Airport (IAD) to London land at Heathrow Airport (LHR). This is the main gateway to this city.

Changes are usually free within 24 hours of making your booking, but your airline may add a charge after that time. For further details about altering your reservation, head to your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to update your itinerary without extra charges, apply the “Changes included” or “No cancel fee” filter when planning your next escape.