London City
Washington, D.C. Dulles Intl
2 stops
37h 20mMultiple Airlines
London Gatwick
Baltimore/Washington
1 stop
11h 25mIcelandair
London Heathrow
Washington, D.C. Dulles Intl
1 stop
14h 15mTAP AIR PORTUGAL
London Gatwick
Washington, D.C. Dulles Intl
1 stop
31h 40mRoyal Air Maroc
London City
Washington, D.C. Dulles Intl
1 stop
30h 05mAer Lingus
London Heathrow
Baltimore/Washington
1 stop
27h 00mIcelandair
London Heathrow
Washington, D.C. Dulles Intl
1 stop
25h 35mWashington, D.C. Dulles Intl
London Heathrow
1 stop
22h 10mBrussels Airlines
London Heathrow
Washington, D.C. Dulles Intl
1 stop
12h 35mWashington, D.C. Dulles Intl
London Heathrow
1 stop
22h 50mMultiple Airlines
London Heathrow
Washington, D.C. Dulles Intl
1 stop
26h 50mWashington, D.C. Dulles Intl
London Heathrow
1 stop
16h 05mIcelandair
London Gatwick
Washington, D.C. Dulles Intl
1 stop
31h 40mWashington, D.C. Dulles Intl
London Gatwick
1 stop
13h 20mRoyal Air Maroc
London Gatwick
Washington, D.C. Dulles Intl
1 stop
27h 55mWashington, D.C. Dulles Intl
London Gatwick
1 stop
11h 50mTAP AIR PORTUGAL
London Heathrow
Washington, D.C. Dulles Intl
Nonstop
8h 05mWashington, D.C. Dulles Intl
London Heathrow
Nonstop
7h 20mFinnair
January
£1,941
February
£1,554
March
£1,766
April
£1,460
May
£1,895
June
£2,439
July
£2,156
August
£2,161
September
£2,081
October
£2,198
November
£2,099
December
£1,699
Currently, April is the cheapest month in which you can book a business class flight to Washington, D.C.. Flying business class to Washington, D.C. in June will prove the most costly. There are multiple factors that influence the price of a flight so comparing airlines, departure airports and times can help keep costs down.