April is by far the best month, wherein you can get cheapest flights for London to Washington. Meanwhile, is perceived as the expensive month due to the varying factors. That’s why it’s highly advised to make advanced online flight booking to save huge amounts of money.
Disclaimer - All the mentioned fares were found within last 48 hrs. The displayed fares are based on historical data and are subject to change. The fares cannot be guaranteed at the time of booking.

London
13:05
London Heathrow Airport [LHR]
Wed , 22 Apr 2026

Washington
19:20
Washington Dulles International Airport [IAD]
Wed, 22 Apr 2026

London
13:05
London Heathrow Airport [LHR]
Wed , 29 Apr 2026

Washington
19:20
Washington Dulles International Airport [IAD]
Wed, 29 Apr 2026

London
21:25
London Heathrow Airport [LHR]
Mon , 27 Apr 2026

Washington
19:20
Washington Dulles International Airport [IAD]
Tue, 28 Apr 2026

London
06:55
London Heathrow Airport [LHR]
Wed , 29 Apr 2026

Washington
19:25
Washington Dulles International Airport [IAD]
Wed, 29 Apr 2026

London
06:55
London Heathrow Airport [LHR]
Wed , 22 Apr 2026

Washington
15:00
Washington Dulles International Airport [IAD]
Wed, 22 Apr 2026

London
06:55
London Heathrow Airport [LHR]
Mon , 27 Apr 2026

Washington
15:00
Washington Dulles International Airport [IAD]
Mon, 27 Apr 2026

London
06:55
London Heathrow Airport [LHR]
Mon , 13 Apr 2026

Washington
15:00
Washington Dulles International Airport [IAD]
Mon, 13 Apr 2026

London
09:55
London Heathrow Airport [LHR]
Thu , 30 Apr 2026

Washington
15:35
Washington Dulles International Airport [IAD]
Thu, 30 Apr 2026

London
06:30
London Heathrow Airport [LHR]
Thu , 30 Apr 2026

Washington
15:35
Washington Dulles International Airport [IAD]
Thu, 30 Apr 2026

London
06:30
London Heathrow Airport [LHR]
Thu , 30 Apr 2026

Washington
15:35
Washington Dulles International Airport [IAD]
Thu, 30 Apr 2026

London
09:55
London Heathrow Airport [LHR]
Thu , 30 Apr 2026

Washington
15:35
Washington Dulles International Airport [IAD]
Thu, 30 Apr 2026









