London to Washington D.C. flight
Flights from London to Washington D.C. start at £374.18.
Check dates and fares
Fares and seats move by the day. Price London to Washington D.C. on the date you actually want, rather than on the date this page was built.
The Flights from London to Washington D.C. starts at £374.18, run by 4 operators over 6,076 km. Fares bottom out about 90 days before departure.
- 11h 18mDoor to door
- 8h 8mMoving
- £443.93 to £928.17From
- 1780.3 kgCO2
11h 18m
8h 8m
£443.93 to £928.17
1780.3 kg£443.93 to £928.17 for one passenger across the 14 departure dates priced here. The low end is one day, not every day. Typical for this corridor. The operator sets the price on the day.
Kiwi.com sells the ticket itself, so you pay there rather than being handed on again.
Continue on Kiwi.comFares by date
What this journey usually costs, by departure date. It shows which days run dearer.
Typical fares
- about £851.34Wed7
- about £928.17Thu8
- about £862.96Fri9
- about £719.91Sat10
- about £647.13Sun11
- about £559.18Mon12
- about £558.67Tue13
- about £477.79Wed14
- about £602.64Thu15
- about £551.59Fri16
- about £573.33Sat17
- about £521.76Sun18
- about £452.01Mon19
- about £443.93Tue20
Based on what this route has cost recently. The live fare is confirmed when you book.
Airlines
| Operator | From | Fastest |
|---|---|---|
 Finnair | £374.18 | 11h 12m |
 British Airways | £382.25 | 11h 12m |
| United Airlines | £379.73 | 11h 11m |
 Virgin Atlantic Airways | £376.19 | 11h 11m |
The flight gets you into Washington D.C.. These two partners take it from there, and the bed is theirs to book.
A room in Washington D.C. for the night the flight gets in
Sort by distance from Washington Union Station and you can see which places are ten minutes on foot and which are not.
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When to book London to Washington D.C.
The same search run across the whole booking window, so the shape of the curve is visible rather than described.
- £304.4290 days
- £454.0460 days
- £373.6745 days
- £408.0430 days
- £377.2121 days
- £443.9314 days
- £558.677 days
- £862.963 days
- £851.341 days
- Cheapest lead time
- Fares bottom out around 90 days ahead, at £304.42.
- How much it moves
- The gap between the cheapest and dearest lead time is 183 percent. The dearest point is £862.96, 3 days out.
- What that means
- Today sits inside the cheap window, which closes about 90 days before departure. Waiting from here has usually cost money on this corridor rather than saved it.
Which departure day costs least
Median cheapest fare for each weekday, taken across the next three weeks of real prices.
- £521.76Sun
- £452.01Mon
- £443.93Tue
- £477.79Wed
- £602.64Thu
- £551.59Fri
- £573.33Sat
Where you leave from and where you arrive
London
Air- LHR
- LGW
- STN
- LTN
- LCY
- SEN
Washington
- IAD
- DCA
What the journey looks like
- How far it really runs
- The route covers 6,076 km against 5,899 km in a straight line, a detour of 3 percent. Track and road geometry account for the difference.
Questions about London to Washington D.C.
The questions people actually ask about this journey, answered from the same prices and times the page above is built on rather than written once and left to go stale.
How long does the Flight from London to Washington D.C. take?
The Flight from London to Washington D.C. covers 6,076 km. Each operator's own departure and arrival times for the date you pick are in the search at the top of this page, beside the total price.
How much does the Flight from London to Washington D.C. cost?
The Flight from London to Washington D.C. starts at £374.18 for one passenger, as of 6 October 2026. A typical fare is £450.75. Both are the total including taxes, supplier fees and our service fee, so the price here is the price at checkout.
Who runs the Flight from London to Washington D.C.?
4 operators run the Flight from London to Washington D.C.: Finnair, British Airways, United Airlines, Virgin Atlantic Airways. The operator table on this page sets out fare, journey time, cruising speed, fare conditions and what is provided on board.
Which terminal does the Flight from London to Washington D.C. use?
The Flight from London to Washington D.C. leaves from London Heathrow Airport LHR and arrives at Washington Dulles International Airport IAD. Allow about 3h 10m for reaching the departure terminal and leaving the arrival one. That time is already inside every door to door figure quoted on this page.
When should I book the Flight from London to Washington D.C.?
Fares for the Flight from London to Washington D.C. bottom out around 90 days ahead, at £304.42. The gap between the cheapest and dearest lead time across the window is 183 percent, measured on 6 October 2026. Booking inside the final week has consistently cost more.
How much CO2 does the Flight from London to Washington D.C. produce?
The Flight from London to Washington D.C. produces about 1780.3 kg of CO2 per passenger over 6076 km, which works out at roughly 293 grams per passenger kilometre. That figure is for the whole journey and for one traveller, not for the vehicle.
Where these numbers come from
Places, coordinates, operators, which operator serves which pair, and every distance on this page are real and come from open data. Where a corridor has a filed timetable the departure times are real too, and ferry fares are the prices the operators publish themselves.
Observed service A carrier record names this operator on this pair, carried through unchanged.
Prices come from the supplier wherever we hold a live quote. Elsewhere we show an indicative price built from the real distance, the real operator and a fare curve over lead time, day of the week and season. Those are labelled Estimated fare and cannot be booked.
Defined in full at Door to door, Fares, The booking window, Carbon