AirHint found the following cheapest return flights from Washington (DCA) to London (LGW) in April 2026 (see full year).

Return flights

29 Apr - 05 May	jetBlue
15 Apr - 09 May	jetBlue
25 Apr - 07 May	jetBlue
16 Apr - 09 May	jetBlue
22 Apr - 16 May	jetBlue
01 Apr - 25 Apr	jetBlue
17 Apr - 26 Apr	jetBlue
17 Apr - 09 May	jetBlue
03 Apr - 18 Apr	jetBlue
08 Apr - 15 Apr	jetBlue
28 Apr - 23 May	jetBlue
09 Apr - 23 Apr	jetBlue
04 Apr - 10 Apr	Icelandair
16 Apr - 21 Apr	Icelandair
03 Apr - 12 Apr	Icelandair
02 Apr - 09 Apr	TAP
23 Apr - 27 Apr	Icelandair
06 Apr - 02 May	TAP

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

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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Cheapest return flights from Washington to London in April from $579

Return flights