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 2026-07-23 → 2026-07-30. Showing recent fares on IAD → LHR — pick a different date in the calendar above or run a live search.

Washington → London · 19 fares12-month low · $334

Cached from Travelpayouts · filter & sort below

Showing 19 of 19 results

Cheapest
Icelandair · FI 644
OutboundIAD → LHRSun, Jul 5 · 12:30 AM· 9h 5m· 1 stop
$334
one-way
Book →
TAP Portugal · TP 234
OutboundIAD → LHRThu, Oct 1 · 2:35 AM· 10h 5m· 1 stop
ReturnLHR ← IADMon, Oct 5 · 5:00 AM· 11h 20m· 1 stop
$483
total round-trip
Book →
Air Canada · AC 3569
OutboundIAD → LHRSat, Jul 4 · 2:10 AM· 8h 14m· 1 stop
$526
one-way
Book →
TAP Portugal · TP 234
OutboundIAD → LHRThu, Oct 15 · 2:35 AM· 10h 5m· 1 stop
ReturnLHR ← IADWed, Oct 28 · 6:30 PM· 11h 40m· 1 stop
$640
total round-trip
Book →
TAP Portugal · TP 232
OutboundIAD → LHRSat, Jul 4 · 9:05 PM· 10h 10m· 1 stop
ReturnLHR ← IADWed, Jul 15 · 6:50 PM· 11h 15m· 1 stop
$734
total round-trip
Book →
United Airlines · UA 918
OutboundIAD → LHRFri, Jul 10 · 10:30 PM· 7h 25m· Non-stop
ReturnLHR ← IADTue, Jul 28 · 7:45 AM· 11h 40m· 1 stop
$785
total round-trip
Book →
TAP Portugal · TP 232
OutboundIAD → LHRFri, Jul 3 · 9:05 PM· 10h 10m· 1 stop
ReturnLHR ← IADWed, Jul 8 · 5:00 AM· 11h 20m· 1 stop
$811
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRSat, Jun 27 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADWed, Jul 15 · 5:40 AM· 10h 25m· 1 stop
$837
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRFri, Jun 26 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADThu, Jul 16 · 5:40 AM· 10h 25m· 1 stop
$837
total round-trip
Book →
TAP Portugal · TP 232
OutboundIAD → LHRFri, Jul 3 · 9:05 PM· 10h 10m· 1 stop
ReturnLHR ← IADFri, Jul 17 · 11:00 AM· 11h 10m· 1 stop
$887
total round-trip
Book →
Icelandair · FI 644
OutboundIAD → LHRFri, Jul 17 · 12:30 AM· 9h 5m· 1 stop
ReturnLHR ← IADSat, Jul 25 · 4:05 PM· 8h 15m· Non-stop
$915
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRSat, Jun 27 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADTue, Jul 14 · 6:30 PM· 10h 25m· 1 stop
$926
total round-trip
Book →
Icelandair · FI 648
OutboundIAD → LHRMon, Jun 15 · 3:20 AM· 9h· 1 stop
ReturnLHR ← IADThu, Jun 18 · 12:05 PM· 9h 40m· 1 stop
$989
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRTue, Jun 23 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADWed, Jul 1 · 5:40 AM· 10h 25m· 1 stop
$1,056
total round-trip
Book →
TAP Portugal · TP 232
OutboundIAD → LHRSat, Jul 11 · 9:05 PM· 10h 10m· 1 stop
ReturnLHR ← IADSat, Jul 18 · 6:50 PM· 11h 20m· 1 stop
$1,060
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRSun, Jun 21 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADSat, Jun 27 · 5:40 AM· 10h 25m· 1 stop
$1,117
total round-trip
Book →
Icelandair · FI 644
OutboundIAD → LHRWed, Jun 24 · 12:30 AM· 9h 5m· 1 stop
ReturnLHR ← IADTue, Jun 30 · 8:25 PM· 9h 35m· 1 stop
$1,132
total round-trip
Book →
SAS · SK 926
OutboundIAD → LHRSun, Jun 21 · 12:20 AM· 9h 50m· 1 stop
ReturnLHR ← IADFri, Jul 3 · 6:30 PM· 10h 25m· 1 stop
$1,154
total round-trip
Book →
KLM · KL 7120
OutboundIAD → LHRWed, Dec 23 · 11:20 PM· 8h 40m· 1 stop
ReturnLHR ← IADSat, Jan 2 · 6:00 AM· 11h 45m· 1 stop
$1,291
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.

Jun
Shoulder
from $837
Jul
Low
from $734
Aug
No data
Sep
Low
from $483
Oct
Low
from $640
Nov
No data
Dec
Peak
from $1291
Jan
No data
Feb
No data
Mar
No data
Apr
No data
May
No data

Cheapest next 12 months: September from $483 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

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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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