Cheapest return flights from Washington (IAD) to London (LHR), May

18 dates in May 2027, from $ 717. Book in one tap, or check whether to buy now or wait.

One-wayReturn
Dates, airline, and price
Dates Airline Price
9 May 16 May 2027 Air Canada
11 May 18 May 2027 Aer Lingus
12 May 19 May 2027 British Airways
2 May 8 May 2027 Air Canada
19 May 21 Jun 2027 Air Canada
19 May 26 May 2027 Air Canada
18 May 26 May 2027 Air Canada
1 May 15 May 2027 Scandinavian Airlines
19 May 23 Jun 2027 Air Canada
6 May 21 May 2027 Scandinavian Airlines
7 May 10 May 2027 British Airways
23 May 30 May 2027 Air Canada
25 May 8 Jun 2027 TAP
31 May 21 Jun 2027 Royal Air Maroc
19 May 23 Jun 2027 Iberia
Direct Flight
26 May 2 Jun 2027 British Airways
Direct Flight
25 May 8 Jun 2027 British Airways
Direct Flight
19 May 21 Jun 2027 American Airlines
Direct Flight
Powered by

Cheapest deals for the full year

Deals for one-way flights from Washington to London in May.

Book a cheap hotel in London

Cheap car rent in Heathrow

Updated Oct 13, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

Feel free to contact us with any feedback or request another flight research.