Flights Washington → London
IAD → LHR
Route overview
The flight route from Washington to London operates with a high frequency of fourteen flights annually, featuring aircraft such as the Boeing 747-400, Boeing 777, Airbus A330-300, and Boeing 757-200. With a punctuality rate of seventy-five percent and an average delay of six minutes, this route ensures relatively reliable travel for passengers connecting to London's busy airport, which serves over eighty-three million passengers per year.
Your rights on this US flight (DOT)
US flights have no statutory cash compensation for delays. Under the US DOT rules, if your flight is cancelled or significantly changed and you decline rebooking, you're owed an automatic refund of the unused ticket. The tarmac-delay limit is 3 hours (domestic) / 4 hours (international). Amenities for controllable delays depend on each airline's contract of carriage.
US flight refund rules & checker →General information, not legal advice.
The Washington (IAD) → London (LHR) route is operated by American Airlines, British Airways, Delta Air Lines, Iberia Airlines, Lufthansa Cargo, United Airlines. Across 14 flights monitored in recent months, 75% arrived on time (within 15 min of schedule), with an average delay of 6 minutes. The cancellation rate is 0.00%. FlightGuard's average computed risk is 16.4/100 (medium), updated in real time from weather, ATC delays, strikes, NOTAMs, fuel and flight history. At London the average ATFM delay is 1.8 minutes (main cause: atfm). Departing from Washington the average ATFM delay is 2.0 minutes.
Heading to London: what to expect in this direction
Flying from Washington (IAD) to London (LHR) heads north-east for about 5,902 km, a flight time of roughly 7h 48m.
Departures from Washington on this leg cluster in the evening window: about 100% of IAD-LHR flights take off then.
Air-traffic congestion: departing Washington the average ATFM delay is 2.0 min (atfm); arriving into London it is 1.8 min (atfm).
Across 14 tracked IAD-LHR flights, 75% left on time with an average delay of 6 min and a 0.0% cancellation rate.
Route facts
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Airline punctuality on this route
| Airline | On-time | Average delay | Cancellations |
|---|---|---|---|
| Iberia Airlines (IB) | 86% | 17 min | 4.8% |
| Delta Air Lines (DL) | 80% | 8 min | 1.8% |
| British Airways (BA) | 77% | 17 min | 2.4% |
| Lufthansa Cargo (LH) | 76% | 15 min | 7.1% |
| United Airlines (UA) | 74% | 10 min | 6.9% |
| American Airlines (AA) | 74% | 16 min | 3.0% |
Airlines operating IAD-LHR
Airports
Frequently asked questions about IAD-LHR
On the Washington (IAD) -> London (LHR) route, on-time performance is 75% with an average delay of 6 minutes, based on 14 tracked flights.
The cancellation rate on Washington-London is 0.00% across 14 monitored flights.
The route is operated by 6 airlines: American Airlines, British Airways, Delta Air Lines, Iberia Airlines, Lufthansa Cargo, United Airlines.
Enter your flight number on FlightGuard for a real-time analysis based on 9 factors: weather at London, ATC delays, strikes, NOTAMs, fuel, airline punctuality and recent trends.
US flights have no statutory cash compensation for delays. Under US DOT rules, if the airline cancels or significantly changes your flight and you decline rebooking, you're owed an automatic refund of the unused ticket. The tarmac-delay limit is 3 hours (domestic) / 4 hours (international). Meals or hotels for controllable delays depend on each airline's contract of carriage.
