London City
Washington, D.C. Dulles Intl
2 stops
19h 30mMultiple Airlines
London Heathrow
Washington, D.C. Dulles Intl
1 stop
12h 20mTAP AIR PORTUGAL
London Gatwick
Washington, D.C. Dulles Intl
1 stop
14h 10mIcelandair
London Gatwick
Washington, D.C. Dulles Intl
1 stop
31h 25mRoyal Air Maroc
London Heathrow
Washington, D.C. Dulles Intl
Nonstop
8h 05mAustrian Airlines
London City
Washington, D.C. Dulles Intl
1 stop
11h 35mAer Lingus
London Heathrow
Washington, D.C. Dulles Intl
Nonstop
8h 00mWashington, D.C. Dulles Intl
London Heathrow
Nonstop
7h 20mFinnair
London Heathrow
Washington, D.C. Dulles Intl
1 stop
12h 20mWashington, D.C. Dulles Intl
London Heathrow
1 stop
15h 30mTAP AIR PORTUGAL
London Heathrow
Washington, D.C. Dulles Intl
1 stop
14h 00mWashington, D.C. Dulles Intl
London Heathrow
1 stop
31h 40mIcelandair
London Heathrow
Washington, D.C. Dulles Intl
1 stop
13h 25mWashington, D.C. Dulles Intl
London Heathrow
Nonstop
7h 20mIberia
London Gatwick
Washington, D.C. Dulles Intl
1 stop
31h 25mWashington, D.C. Dulles Intl
London Gatwick
1 stop
13h 35mRoyal Air Maroc
London Heathrow
Washington, D.C. Dulles Intl
1 stop
24h 05mWashington, D.C. Dulles Intl
London Heathrow
Nonstop
7h 25mAustrian Airlines
January
£2,195
February
£2,130
March
£2,558
April
£1,623
May
£2,055
June
£2,268
July
£2,364
August
£2,026
September
£1,716
October
£2,209
November
£1,964
December
£2,032
Currently, April is the cheapest month in which you can book a business class flight to Washington, D.C. Dulles Intl. Flying business class to Washington, D.C. Dulles Intl in March 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.