For evening departures, expect crowded check-in areas at IAD. Arrive early to navigate the busy terminal efficiently.
Round-trip from | $656 (United) |
---|---|
One-way from | $301 (Mytrip) |
Popular in | June |
Cheapest in | September |
Average price | $1,041 |
Good round-trip deal | $687 or less |
Good one-way deal | $446 or less |
Fly from
Fly to
Route
Depart
Return
Price
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Wed 7/30
6:35 pm-6:55 am
Nonstop7h 20m
London Heathrow
Mon 8/4
12:10 pm-4:15 pm
1 stop33h 05m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Tue 7/22
9:35 am-6:30 am
1 stop15h 55m
London Heathrow
Mon 7/28
8:05 pm-4:15 pm
1 stop25h 10m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Mon 7/7
12:00 pm-1:10 pm
1 stop20h 10m
London Heathrow
Mon 7/21
8:10 pm-12:02 pm
1 stop20h 52m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Sun 8/24
10:05 pm-9:40 pm
1 stop18h 35m
London Heathrow
Sun 10/19
10:20 am-7:59 pm
1 stop14h 39m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Fri 7/25
10:40 pm-11:05 am
Nonstop7h 25m
London Heathrow
Fri 8/1
2:25 pm-5:30 pm
Nonstop8h 05m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Mon 7/14
10:40 pm-11:05 am
Nonstop7h 25m
London Heathrow
Mon 7/21
4:25 pm-10:59 am
1 stop23h 34m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Wed 7/30
5:50 pm-6:20 am
Nonstop7h 30m
London Heathrow
Mon 8/4
12:35 pm-4:00 pm
Nonstop8h 25m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Sat 8/30
8:45 pm-7:55 am
1 stop30h 10m
London Heathrow
Mon 9/8
6:40 pm-4:15 pm
1 stop26h 35m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Mon 7/7
7:25 pm-7:45 am
Nonstop7h 20m
London Heathrow
Sun 8/17
5:05 pm-8:15 pm
Nonstop8h 10m
Washington, D.C.London
IAD - LHR
IADLHR
Washington, D.C. Dulles Intl
Mon 7/14
6:10 pm-10:40 am
1 stop11h 30m
London Heathrow
Thu 7/24
6:30 am-1:30 pm
1 stop12h 00m
To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport, you should look to book at least 45 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport (average of $661). Flying from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in June is currently the most expensive (average of $1,108). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
It’s optimal to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the morning. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight at noon.
Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight should consider departing on Wednesday mornings when fares are most often at their lowest. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
The most flights from IAD to LHR are scheduled on a Wednesday (27 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (23 on average).
In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.
If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Kim,May 2025
PIH - SLC
Crew
Overall
Boarding
Comfort
Food
Entertainment
Reviews
Kim,May 2025
PIH - SLC
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