Swiss International Air Lines Cheap Flights from Washington to London

View €431 flight on Tue, 4 Aug 2026Opens in a new window

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Prices were available within the past 7 days and start at €431 for one-way flights and €746 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Sun, 10 May - Tue, 19 May
IAD
Washington
LHR
London
€746 Return, found 5 days ago
€746
Return
found 5 days ago
Select Swiss International Air Lines flight, departing Sun, 10 May from Washington to London, returning Tue, 19 May, priced at €746 found 5 days ago
Swiss International Air Lines
Mon, 6 Jul - Wed, 12 Aug
IAD
Washington
LHR
London
€802 Return, found 3 days ago
€802
Return
found 3 days ago
Select Swiss International Air Lines flight, departing Mon, 6 Jul from Washington to London, returning Wed, 12 Aug, priced at €802 found 3 days ago
Swiss International Air Lines
Thu, 1 Oct - Wed, 7 Oct
IAD
Washington
LCY
London
€851 Return, found 2 days ago
€851
Return
found 2 days ago
Select Swiss International Air Lines flight, departing Thu, 1 Oct from Washington to London, returning Wed, 7 Oct, priced at €851 found 2 days ago
Swiss International Air Lines
Sun, 8 Nov - Thu, 12 Nov
IAD
Washington
LCY
London
€1,009 Return, found 4 days ago
€1,009
Return
found 4 days ago
Select Swiss International Air Lines flight, departing Sun, 8 Nov from Washington to London, returning Thu, 12 Nov, priced at €1,009 found 4 days ago
Swiss International Air Lines
Mon, 18 May - Tue, 26 May
IAD
Washington
LGW
London
€1,101 Return, found 1 day ago
€1,101
Return
found 1 day ago
Select Swiss International Air Lines flight, departing Mon, 18 May from Washington to London, returning Tue, 26 May, priced at €1,101 found 1 day ago
Swiss International Air Lines
Mon, 18 May - Tue, 26 May
IAD
Washington
LGW
London
€1,114 Return, found 1 day ago
€1,114
Return
found 1 day ago
Select Swiss International Air Lines flight, departing Mon, 18 May from Washington to London, returning Tue, 26 May, priced at €1,114 found 1 day ago

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

April is typically the cheapest month to fly

From €409 - €764 per traveller.

Travel information

Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Gatwick
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Popular airline
British Airways
Distance
5829 km
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