AirHint found the following cheapest return flights from Washington (IAD) to London (LHR)
in May 2025 (see full year ).
Return flights
05 May
- 13 May
Icelandair
$ 615
13 May
- 20 May
Icelandair
$ 617
07 May
- 14 May
TAP
$ 627
13 May
- 19 May
Icelandair
$ 628
12 May
- 22 May
Aer Lingus
$ 630
11 May
- 20 May
Aer Lingus
$ 638
05 May
- 12 May
Icelandair
$ 651
10 May
- 20 May
Air Canada
$ 661
05 May
- 28 May
Icelandair
$ 662
12 May
- 26 May
Icelandair
$ 664
13 May
- 17 Jun
Aer Lingus
$ 686
29 May
- 03 Jun
Scandinavian Airlines
$ 712
21 May
- 18 Jun
Air Canada
$ 717
21 May
- 02 Jun
Air Canada
$ 718
29 May
- 09 Jun
Porter Airlines (Canada) Ltd
$ 718
13 May
- 17 Jun
British Airways
$ 721
direct
14 May
- 02 Jun
Icelandair
$ 731
14 May
- 18 Jun
Icelandair
$ 731
27 May
- 02 Jun
Porter Airlines (Canada) Ltd
$ 736
21 May
- 03 Jun
Aer Lingus
$ 740
Also check the deals for one-way flights from Washington to London in May .
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.
