Best time to book Washington to London
Fares vary significantly by season. Booking at the right time can save you considerably.
Transatlantic · 3673 miles
Washington to London Flights — IAD to LHR Airlines, Airports & Fare Tips
Searching for cheap flights from Washington to London? Compare departures from Dulles International (IAD) to Heathrow (LHR). Find the best time to book, top airlines, flight duration, and money-saving tips for your US East Coast to UK trip.
Which airport should you fly from?
Compare departure and arrival airports for the Washington to London route.
IAD — Washington
Dulles International (IAD)
Silver Line Metro to downtown Washington in 60 minutes.
LHR — London
Heathrow (LHR)
Heathrow Express to Paddington in 15 minutes.
Airlines flying Washington to London
British Airways, United, and American Airlines operate nonstop transatlantic flights between Washington Dulles and London Heathrow.
Flight duration & logistics
Nonstop flights from Washington to London take approximately ~7h 20m. The distance is 3673 miles. Around 8+ flights operate daily on this route.
- Flight time: ~7h 20m
- Time difference: +5h
- Daily flights: 8+
Money-saving tips for Washington to London travel
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Book in advance
United has a hub at Dulles — often competitive fares.
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Compare airlines
Book 6–10 weeks ahead for best transatlantic fares.
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Flexible dates
January and February offer the lowest fares.
London — your destination
Discover what awaits after your flight from Washington.
Why book with Tikitikita?
- Compare fares across IAD and LHR in one search
- Flexible date grids to spot the cheapest days to fly
- Filter by nonstop, airline, or departure time
- Prices shown include taxes and surcharges
Frequently asked questions
How long IAD to LHR?
~7h 20m nonstop. Distance ~3673 miles.
Airlines Washington–London?
British Airways, United, American Airlines nonstop.
Cheapest month IAD–LHR?
January, February, November.
US visa for UK?
No visa up to 6 months. eTA required from 2025.
Best time to book?
6–10 weeks in advance.