Washington (IAD) → London (LHR)
Washington Dulles International Airport to London Heathrow Airport · 3,187 nm (5,902 km) · about 7.5 h nonstop
Cheapest economy fares, checked daily · 1 day of history
Booking links are plain searches — none are affiliate links, and the site earns nothing if you book. Prices are the cheapest fares other travellers recently found, not live availability — always confirm the fare before you pay.
Economy
last checked 31m agoIcelandair · 1 stop · 31h 35m · travel Oct 4
| Checked | Fare | Airline | Stops | Travel | Sold via | |
|---|---|---|---|---|---|---|
| 2026-09-09 | $324 | Icelandair | 1 stop | Oct 4 | — | Book ↗ |
Airlines selling the cheapest fares
Which carrier had the lowest fare on each of our checks over the last 90 days.
- Icelandair ×1
About this route
Washington (IAD) to London (LHR) is one of the busiest air routes in its market (Transatlantic). It links Washington Dulles International Airport in United States with London Heathrow Airport in United Kingdom. The great-circle distance is about 3,187 nautical miles (3,668 statute miles), so expect roughly 7.5 hours in the air nonstop.
Every night we ask our fare provider for the cheapest one-way economy fare other travellers recently found on this route and record it, with the airline and the seller it was found with. A fare is flagged as a deal when it falls at least 30% below the route's 90-day typical price. Prices are a research starting point, not live availability — the booking links open the itinerary so you can confirm what's on sale right now.
Fares are approximate, from public sources, and can be stale — always verify before booking.