Cheapest one-way flights from Washington to London in April from $298

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

AirHint found the following cheapest one-way flights from Washington (IAD) to London (LCY) in April 2026 (see full year).

One-Way flights

07 Apr SWISS
26 Apr SWISS
24 Apr ITA Airways
16 Apr SWISS

Also check the deals for return flights from Washington to London in April.

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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