Cheapest return flights from London to Washington in September from 585€

Best time to book flights for London (LHR) to Washington (IAD) flights at AirHint

AirHint found the following cheapest return flights from London (LHR) to Washington (IAD) in September 2025 (see full year).

Return flights

25 Sep - 29 Sep British Airways
05 Sep - 08 Sep British Airways
25 Sep - 30 Sep British Airways
21 Sep - 02 Oct Icelandair
15 Sep - 29 Sep Icelandair
10 Sep - 24 Sep Icelandair
04 Sep - 09 Sep British Airways
08 Sep - 16 Sep Icelandair
29 Sep - 06 Oct Icelandair
01 Sep - 01 Oct Lufthansa
09 Sep - 17 Sep Icelandair
05 Sep - 30 Sep Scandinavian Airlines
19 Sep - 04 Oct Austrian Airlines
22 Sep - 10 Oct Icelandair
20 Sep - 25 Sep Icelandair
27 Sep - 04 Oct Icelandair
25 Sep - 17 Oct Icelandair
01 Sep - 01 Oct Virgin Atlantic direct
01 Sep - 31 Oct Lufthansa
21 Sep - 02 Oct Virgin Atlantic direct

Also check the deals for one-way flights from London to Washington in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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