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

Loading prices…

No cached fares for exactly 2026-09-07 → 2026-09-14. Showing recent fares on IAD → LHR — pick a different date in the calendar above or run a live search.

Washington → London · 15 fares12-month low · $276

Cached from Travelpayouts · filter & sort below

Showing 15 of 15 results

Cheapest
Icelandair · FI 644
OutboundIAD → LHRTue, Sep 22 · 12:30 AM· 9h 10m· 1 stop
$276
one-way
Book →
United Airlines · UA 1997
OutboundIAD → LHRThu, Sep 24 · 2:41 AM· 10h 18m· 2 stops
$410
one-way
Book →
Icelandair · FI 644
OutboundIAD → LHRFri, Dec 4 · 12:40 AM· 9h 5m· 1 stop
ReturnLHR ← IADMon, Dec 7 · 12:15 PM· 9h 55m· 1 stop
$525
total round-trip
Book →
TAP Portugal · TP 234
OutboundIAD → LHRFri, Sep 18 · 2:35 AM· 10h 5m· 1 stop
ReturnLHR ← IADTue, Sep 22 · 5:00 AM· 11h 15m· 1 stop
$560
total round-trip
Book →
TAP Portugal · TP 234
OutboundIAD → LHRFri, Sep 18 · 2:35 AM· 10h 5m· 1 stop
ReturnLHR ← IADThu, Sep 24 · 5:00 AM· 11h 15m· 1 stop
$560
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRSun, Aug 23 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADSat, Aug 29 · 9:20 AM· 10h 35m· 1 stop
$666
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRFri, Aug 28 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADMon, Aug 31 · 9:20 AM· 10h 35m· 1 stop
$686
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRSat, Sep 5 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADSat, Sep 12 · 4:00 PM· 10h 30m· 1 stop
$693
total round-trip
Book →
Icelandair · FI 644
OutboundIAD → LHRFri, Oct 2 · 12:30 AM· 9h 5m· 1 stop
ReturnLHR ← IADThu, Oct 8 · 12:05 PM· 9h 40m· 1 stop
$704
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRSat, Sep 12 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADSun, Sep 13 · 5:40 AM· 12h 10m· 2 stops
$707
total round-trip
Book →
Icelandair · FI 644
OutboundIAD → LHRSun, Oct 11 · 12:30 AM· 9h 10m· 1 stop
ReturnLHR ← IADSat, Oct 17 · 8:50 AM· 9h 40m· 1 stop
$716
total round-trip
Book →
Air Canada · AC 4693
OutboundIAD → LHRSun, Nov 22 · 10:37 PM· 9h 53m· 2 stops
ReturnLHR ← IADSun, Nov 29 · 8:50 AM· 9h 45m· 1 stop
$782
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRFri, Aug 7 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADMon, Aug 10 · 9:20 AM· 10h 35m· 1 stop
$831
total round-trip
Book →
United Airlines · UA 1998
OutboundIAD → LHRThu, Sep 3 · 10:16 AM· 8h 4m· 1 stop
ReturnLHR ← IADSat, Sep 5 · 12:05 PM· 9h 35m· 1 stop
$942
total round-trip
Book →
Icelandair · FI 644
OutboundIAD → LHRMon, Dec 14 · 12:40 AM· 9h 5m· 1 stop
ReturnLHR ← IADSat, Jan 2 · 7:25 PM· 11h 50m· 1 stop
$1,017
total round-trip
Book →

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.

Jul
No data
Aug
Shoulder
from $666
Sep
Low
from $560
Oct
Peak
from $704
Nov
Peak
from $782
Dec
Low
from $525
Jan
No data
Feb
No data
Mar
No data
Apr
No data
May
No data
Jun
No data

Cheapest next 12 months: December from $525 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.

Price drop alerts

Email me when Washington → London drops.

One email per route, only when fares actually move. Set a ceiling if you only want to hear about big drops.

Also text me when it drops — fastest alert

We’ll never share your email. Unsubscribe in any send.

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

Complete your London trip

Trip plannerLondon one-stop planTours, transfers, packages, and events for London in one place.StaysWhere to stay in LondonNeighborhood-by-neighborhood picks with live nightly rates.ExperiencesThings to do in LondonCurated sights, food, nightlife, and tours across every district.Getting thereCheap flights to LondonUS gateway fares with the months each route bottoms out.NeighborhoodsLondon by districtLongform breakdowns of where locals eat, drink, and sleep.When to goBest time to visit United KingdomMonth-by-month verdicts on weather, crowds, and prices.