How long is the flight from Washington to London?

Non-stop flights on IAD → LHR are typically around 7 hours. Connecting itineraries add 3–8 hours depending on the hub and layover.

Which airlines fly from Washington to London?

The main carriers on this route are British Airways, United, Virgin Atlantic. Codeshare and one-stop options add several more — the filter panel above shows every airline in the current fare set.

When is the cheapest time to fly from Washington to London?

Historically the lowest fares land in January, November. Summer (mid-June through mid-August) and the Christmas / New Year window are always peak. Mid-week departures (Tuesday–Thursday) typically beat weekend prices by 10–20%.

How far ahead should I book Washington to London?

Six to ten weeks ahead is the sweet spot for this route. Inside three weeks, fares tend to spike as airlines sell to last-minute business travellers. Award availability often opens 10–11 months out if you're booking on miles.

Can I book directly on destination.com?

The Book button on each fare opens the airline or OTA (Trip.com, Kiwi, Expedia, Booking, Priceline, etc.) that's actually selling that ticket. You complete payment there at the same price you saw here — we never add a markup.

IAD → LHR

Washington to London flights.

Live cached fares on Washington (IAD) → London (LHR), refreshed every 30 minutes. Non-stop and connecting itineraries side by side — compare airlines, times and stops, then book in one click.

Flying time
~7h non-stop
Airlines
British Airways, United, Virgin Atlantic
Cheapest months
January, November

Flex dates · cheapest nearby

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Read our best-time-to-book guide for IAD → LHR →Target price, booking window, weekday pattern.

See 30-day price history for IAD → LHR →Median fare, lows, and best-day patterns.

No cached fares for exactly 2026-12-06 → 2026-12-13. Showing recent fares on IAD → LHR — pick a different date in the calendar above or run a live search.

Washington → London · 4 fares12-month low · $329

Cached from Travelpayouts · filter & sort below

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Try a nearby airport

Thin routes often have more options from a neighbouring airport.

Washington (DCA) → London (LHR)

nearby origin

Baltimore (BWI) → London (LHR)

nearby origin

Washington (IAD) → London (LGW)

nearby destination

About Washington → London

IAD → LHR non-stops fly 6-8x daily. Dulles usually undercuts JFK fares by 10-15%.

Typical non-stop flying time is around 7 hours. Major carriers on this route include British Airways, United, Virgin Atlantic. Fares are usually cheapest in January, November — book 6–10 weeks ahead and avoid school-holiday peaks (late June–August, Christmas–New Year) for the best pricing.

Month-by-month price guide: Washington to London

Live cheapest round-trip fare cached on IAD → LHR for each of the next 12 months. Tap any month and run a live search to confirm.

Oct
No data
Nov
Peak
from $876
Dec
Shoulder
from $773
Jan
Low
from $606
Feb
No data
Mar
Peak
from $912
Apr
No data
May
No data
Jun
No data
Jul
No data
Aug
No data
Sep
No data

Cheapest next 12 months: January from $606 round-trip. Run a live search →

Booking window tip

Medium-haul is the classic 6-10 week booking window. Fares drift down as the departure gets closer until about 21 days out, then start climbing fast. Tuesday and Wednesday departures are typically 10-18% cheaper than Friday or Sunday.

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Where to stay

Once you’ve booked the flight, pick a London neighbourhood.

See where to stay in London →

Questions, answered

How long is the flight from Washington to London?
Non-stop flights on IAD → LHR are typically around 7 hours. Connecting itineraries add 3–8 hours depending on the hub and layover.
Which airlines fly from Washington to London?
The main carriers on this route are British Airways, United, Virgin Atlantic. Codeshare and one-stop options add several more — the filter panel above shows every airline in the current fare set.
When is the cheapest time to fly from Washington to London?
Historically the lowest fares land in January, November. Summer (mid-June through mid-August) and the Christmas / New Year window are always peak. Mid-week departures (Tuesday–Thursday) typically beat weekend prices by 10–20%.
How far ahead should I book Washington to London?
Six to ten weeks ahead is the sweet spot for this route. Inside three weeks, fares tend to spike as airlines sell to last-minute business travellers. Award availability often opens 10–11 months out if you're booking on miles.
Can I book directly on destination.com?
The Book button on each fare opens the airline or OTA (Trip.com, Kiwi, Expedia, Booking, Priceline, etc.) that's actually selling that ticket. You complete payment there at the same price you saw here — we never add a markup.

Other ways to reach London

If your plans are flexible on the origin, these alternate departure airports also serve London on the routes we track.

Other popular routes

Keep planning

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