ExceptionalNonstop · 3.5h
LON to RAKMorocco
Marrakech
$48
usually $130
−63%
Most monthly lows $74–$164. Cheaper than every other month on record (6).
Flights · LON → WAS
London to Washington
Best fare, round trip
$428
−10%
below its usual $475
you keep $47
Found
- Depart
- Sun 8 Nov
- Return
- Sun 15 Nov
- Stay
- 7 nights
- Flight
- 1 stop · 10h
- Airline
Aer Lingus
Most of this route’s monthly lows fall between $464 and $475. The drop beats 21% of measured fares on the board, over 4 observed months.
Cached fare — the booking search re-prices live before you pay.
United StatesWashingtonFree museums by the dozen, and three airports competing hard enough to keep transatlantic fares honest.Best windowApr–May · Sep–OctAirportsDulles (IAD) · Reagan National (DCA) · Baltimore (BWI)Every route into WashingtonFare seasonality
When this route gets cheap.
Fares bottom out in November around $428 and peak in October near $665, 55% dearer, across the 4 months we track. The cheapest itinerary we are tracking makes one stop and takes about 10 hours outbound, on a 7-night trip — ticketed under Aer Lingus, which on a connecting fare need not operate every leg. At $428 for 5,898 km each way, that works out to about $36 per 1,000 km flown. That is below the $43 per 1,000 km typical of medium-haul fares here. Of the 16 departure cities we track at a similar distance from Washington, this is the cheapest right now — 25% under the next one, Rome. That puts it in the cheaper half of the 12 routes of similar length we watch out of London, where the middle fare is $667. The best time to be in Washington: Apr–May · Sep–Oct.
Day-level prices for the next 4 months
Press a day to compare its fares
The median cached fare across this calendar is 8% lower than when tracking began on 8 Aug — $797 then versus $730 now, across 20 recorded snapshots. This is a calendar-level trend, so an individual deal above can be lower. The lowest single day we have seen here is $414, on 25 Nov.
Cached day-level data for this route is sparse — 10 of 109 days priced, from 48 tracked fares. The days below are shown as found, with no cheapest-day or below-median call.
October 2026
November 2026
December 2026
1234567891011121314151617Friday 18 December: $732. Compare fares from this day.Saturday 19 December: $728. Compare fares from this day.202122Wednesday 23 December: $464. Compare fares from this day.2425262728293031
January 2027
12345678910111213141516171819202122232425262728293031
Cached fares · checked 15 Oct 2026
Cheapest in Nov, around $428
10% below the $475 typical fare
$665Oct, above the usual price. Compare October fares.$428Nov, the cheapest month. Compare November fares.$464Dec, around the usual price. Compare December fares.$474May ’27, around the usual price. Compare May fares.
CheapestBelow usualUsualAbove usualPress a month to compare its fares
Cheapest round-trip fare found each month, London to Washington, from cached prices.
Route facts
- Airports
- Heathrow (LHR) · Gatwick (LGW) · Stansted (STN) · Luton (LTN) ↔ Dulles (IAD) · Reagan National (DCA) · Baltimore (BWI)
- Flight time
- ≈10 hours outbound
- Distance
- ≈5,898 km each way
- Typical price
- $475 round-trip (seasonal median)
- Airlines on the board
- Aer Lingus
- Itineraries
- Connections on current fares
- Best months to visit
- Apr–May · Sep–Oct
Good to know
LON → WAS, answered.
Is $428 a good price for London to Washington?
Only slightly. The seasonal median is around $475 round-trip and this fare is 10% under it. We do not call a drop notable until 20%, so this is an ordinary price for the route rather than a reason to hurry.
What is the cheapest month to fly from London to Washington?
Across 4 months of cached-fare history, Nov comes out cheapest on this route. The best months to actually be in Washington are Apr–May · Sep–Oct — when those overlap, that's your window.
How far in advance should I book LON → Washington?
We do not publish a number for this, because we cannot measure it yet. Answering it honestly means watching the same departure date on this route over many weeks as it approaches, and that archive is still filling up — so any "book N days ahead" figure here would be borrowed from somewhere else rather than measured. What we can measure is which month is cheap: across 4 months of cached fares, Nov comes out lowest on this route. Our guide Why flight prices change covers what does move a fare.
Are there nonstop flights from London to Washington?
The current cheapest fares involve a connection, ticketed under Aer Lingus. We hold no nonstop fare on this route right now, which does not mean none flies — search your exact dates to see what does.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on 17 October). Airlines reprice constantly, so the booking search re-checks the live price before you pay. Fresher finds are far more likely to still be available.
Next step
Sleeping in Washington?
Lock the flight first — then compare stays for 8–15 Nov · 7 nights.
Browse hotelsMissed it?
Cached fares expire. This route has a feed of its own — follow it and the next LON → WAS drop reaches you as soon as we find it.
Follow this route’s feedKeep browsing
Related routes on the board.
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