Cheap flights from London to Washington from $573 LCY, LGW, LHR, LTN, SEN, STN → DCA, IAD
London City Airport (LCY), London Gatwick Airport (LGW), London Heathrow Airport (LHR), London Luton Airport (LTN), London Southend Airport (SEN), Stansted Airport (STN) → Ronald Reagan National Airport (DCA), Washington Dulles International Airport (IAD)
The cheapest return found recently is $573 with Icelandair, 20 May 2027 – 30 May 2027, found 2 days ago.
- Cheapest return found recently
- $573, 20 May 2027 to 30 May 2027
- Usual return price
- $573 to $886
- Cheapest month to fly
- February 2027, return fares from $468 found in the last 7 days
Return
The cheapest return fare on each of 5 departure dates is usually $573 to $886.
Cheapest return found recently
$573
20 May 2027 – 30 May 2027 · Icelandair
London Heathrow Airport (LHR) → Washington Dulles International Airport (IAD)
Leaves 1:05 p.m. · Return leaves 8:30 p.m. · 21 h 40 min of travel, both ways together
out 1 stop, back 1 stop
found 2 days ago
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$573 20 May 2027 – 30 May 2027found 2 days agoSee prices for these dates
$468 26 Feb 2027 – 7 Mar 2027found 3 days agoSee prices for these dates
What have prices looked like?
Over 49 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $463 to $934.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 5 departure dates from 20 Nov to 20 May 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 10-night return fares leaving within 3 days of 20 May 2027 to compare.
Every date we hold
22 fares on 5 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 20 Nov – 3 Dec | $979 | SWISS | London City Airport (LCY) → Washington Dulles International Airport (IAD) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 7 Dec – 10 Dec | $886 | Helvetic Airways | London City Airport (LCY) → Washington Dulles International Airport (IAD) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
| 19 Dec – 7 Jan 2027 | $786 | British Airways | London Heathrow Airport (LHR) → Ronald Reagan National Airport (DCA) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 26 Feb 2027 – 7 Mar 2027 | $468 | Icelandair | London Heathrow Airport (LHR) → Washington Dulles International Airport (IAD) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
| 20 May 2027 – 30 May 2027 | $573 | Icelandair | London Heathrow Airport (LHR) → Washington Dulles International Airport (IAD) | out 1 stop, back 1 stop | found 2 days ago | See prices for these dates |
Which month looks cheapest?
February 2027 is the cheapest month — from $468.
Airlines on the cheapest dates: Icelandair, SWISS, Helvetic Airways, British Airways.
Premium cabin fares from London to Washington
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 20 May 2027 – 30 May 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for London to Washington?
Return
Fares 90 to 179 days before departure were typically 50% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 11 Nov (49 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $934 | $816 | +98% | 16 |
| 7–13 days | $979 | $717 | +107% | 27 |
| 14–29 days | $745 | $469 | +58% | 25 |
| 30–59 days | $660 | $530 | +40% | 13 |
| 60–89 days | $528 | $464 | +12% | 24 |
| 90–179 days | $472 | $463 | Cheapest seen | 24 |
| 180+ days | $570 | $469 | +21% | 40 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
London → Baltimore
57 km from Washington
$652
$79 more than flying to Washington
20 May 2027 – 30 May 2027 · LGW → BWI · out 1 stop, back 1 stop
found 2 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 20 May 2027 – 30 May 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from London to Washington?
The cheapest return found recently is $573 with Icelandair, 20 May 2027 to 30 May 2027, found 2 days ago. The cheapest return we hold, of any age, is $468 with Icelandair, 26 Feb 2027 to 7 Mar 2027, found 3 days ago. The cheapest return fare on each of 5 departure dates is usually $573 to $886.
What is the cheapest month to fly from London to Washington?
February 2027 is the cheapest month for a return, from $468, 26 Feb 2027 to 7 Mar 2027, found 3 days ago.
How far ahead should I book a flight from London to Washington?
In 49 days of prices between 24 Sept and 11 Nov, return fares 90 to 179 days before departure were typically 50% lower than 0 to 6 days before departure.
Which airlines have the cheapest flights from London to Washington?
Between 20 Nov and 20 May 2027, Icelandair has the cheapest return on 2 of the 5 departure dates we hold, SWISS on 1 and Helvetic Airways on 1.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work