$414 Cheap American Airlines flights Dallas (DFW) to London (LHR)

Landing cheap one-way American Airlines flights from DFW to LHR from $414 on Expedia is simple — just filter by "Price (lowest to highest)." Or check out our budget-friendly round-trip fares from $515 for your next exciting adventure.**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.

Start your search for American Airlines flights from DFW to LHR about one month before you want to leave. The cheapest time to book an international flight is generally 18 to 29 days ahead of your departure date when you can save 17% versus booking four to five months in advance. No matter your itinerary or ticket type, the best day to book international airfare is usually Sunday. Friday can be the most expensive. Travelers booking on a Sunday can save an average of 17% compared to those who book on a Friday.**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.

The earliest American Airlines flight from DFW to LHR departs at 3:20PM UTC-6, landing at 6:20AM UTC+0. If you prefer to head off later in the day, the last American Airlines flight leaves DFW at 9:06PM UTC-6 and lands at LHR at 12:05PM UTC+0. Flying earlier is generally a wise choice as morning flights are least 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.