$393 Cheap Swiss International Air Lines flights Washington (IAD) to London (LHR)

View $393 flight on Wed, Apr 8, 2026Opens in a new window

$393 Cheap Swiss International Air Lines flights Washington (IAD) to London (LHR)

Prices were available within the past 7 days and start at $393 for one-way flights and $622 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Thu, Mar 12 - Fri, Mar 20
IAD
Washington
LHR
London
$622 Roundtrip, found 1 day ago
$622
Roundtrip
found 1 day ago
Select Swiss International Air Lines flight, departing Thu, Mar 12 from Washington to London, returning Fri, Mar 20, priced at $622 found 1 day ago
Swiss International Air Lines
Thu, Mar 12 - Fri, Mar 20
IAD
Washington
LHR
London
$633 Roundtrip, found 1 day ago
$633
Roundtrip
found 1 day ago
Select Swiss International Air Lines flight, departing Thu, Mar 12 from Washington to London, returning Fri, Mar 20, priced at $633 found 1 day ago
Swiss International Air Lines
Thu, Mar 12 - Fri, Mar 20
IAD
Washington
LHR
London
$636 Roundtrip, found 1 day ago
$636
Roundtrip
found 1 day ago
Select Swiss International Air Lines flight, departing Thu, Mar 12 from Washington to London, returning Fri, Mar 20, priced at $636 found 1 day ago

Find the cheapest month to fly from Washington (IAD) to London (LHR)

January is typically the cheapest month to fly

From $444 - $934 per traveler.
Flights from Washington (IAD) to London (LHR)
Origin airport
Washington Dulles Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Swiss International Air Lines, United, Virgin Atlantic
Popular airline
Delta
Distance
5866 km
Average flight time
12 hours 22 mins