Swiss International Air Lines Cheap Flights from Washington to London

View €335 flight on Mon, 19 Jan 2026Opens in a new window
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Prices were available within the past 7 days and start at €335 for one-way flights and €529 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Sun, 11 Jan - Tue, 27 Jan
IAD
Washington
LGW
London
€529 Return, found 5 days ago
€529
Return
found 5 days ago
Select Swiss International Air Lines flight, departing Sun, 11 Jan from Washington to London, returning Tue, 27 Jan, priced at €529 found 5 days ago
Swiss International Air Lines
Mon, 9 Feb - Mon, 16 Feb
IAD
Washington
LHR
London
€531 Return, found 3 days ago
€531
Return
found 3 days ago
Select Swiss International Air Lines flight, departing Mon, 9 Feb from Washington to London, returning Mon, 16 Feb, priced at €531 found 3 days ago
Swiss International Air Lines
Sun, 15 Feb - Tue, 24 Feb
IAD
Washington
LCY
London
€552 Return, found 21 hours ago
€552
Return
found 21 hours ago
Select Swiss International Air Lines flight, departing Sun, 15 Feb from Washington to London, returning Tue, 24 Feb, priced at €552 found 21 hours ago
Swiss International Air Lines
Sun, 11 Jan - Tue, 20 Jan
IAD
Washington
LCY
London
€554 Return, found 6 days ago
€554
Return
found 6 days ago
Select Swiss International Air Lines flight, departing Sun, 11 Jan from Washington to London, returning Tue, 20 Jan, priced at €554 found 6 days ago
Swiss International Air Lines
Sat, 14 Feb - Tue, 24 Feb
IAD
Washington
LCY
London
€637 Return, found 21 hours ago
€637
Return
found 21 hours ago
Select Swiss International Air Lines flight, departing Sat, 14 Feb from Washington to London, returning Tue, 24 Feb, priced at €637 found 21 hours ago
Swiss International Air Lines
Sun, 11 Jan - Tue, 20 Jan
IAD
Washington
LCY
London
€725 Return, found 6 days ago
€725
Return
found 6 days ago
Select Swiss International Air Lines flight, departing Sun, 11 Jan from Washington to London, returning Tue, 20 Jan, priced at €725 found 6 days ago

Find the cheapest month to fly from Washington (WAS) to London (LON)

February is typically the cheapest month to fly

From €286 - €656 per traveller.

Alternative airports near London

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Heathrow LHR. Cheapest option available. Average driving time to city centre is 28 minutes. Flights from €507
LHR
Heathrow
Cheapest
Average driving time to city centre28 min
Flights from €507
Select flight to Gatwick LGW. Average driving time to city centre is 52 minutes. Flights from €636
LGW
Gatwick
Average driving time to city centre52 min
Flights from €636

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Popular airline
British Airways
Distance
5866 km
*Available to Expedia members.