Flights Houston → London
IAH → LHR
How long is the flight from Houston to London?
The flight from Houston (IAH) to London (LHR) takes 8h 48m on average. That is the median time recorded across 1 scheduled flight on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
Route overview
The flight route from Houston to London has a relatively low on-time performance rate of 43%, with an average delay time of 200.7 minutes per flight. Over the course of a year, this route sees eight total flights using various Boeing aircraft models including the 747-400, 777, 767-300, and 787-8, serving a destination airport that handles approximately 83,884,572 passengers annually.
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 Houston (IAH) → London (LHR) route is operated by American Airlines, British Airways, Iberia Airlines, Lufthansa Cargo, United Airlines. Across 22 flights monitored in recent months, 74% arrived on time (within 15 min of schedule), with an average delay of 75 minutes. The cancellation rate is 0.00%. FlightGuard's average computed risk is 15.6/100 (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 Houston the average ATFM delay is 5.5 minutes.
Heading to London: what to expect in this direction
Flying from Houston (IAH) to London (LHR) heads north-east for about 7,763 km, a flight time of roughly 8h 48m.
Departures from Houston on this leg cluster in the evening window: about 100% of IAH-LHR flights take off then.
Air-traffic congestion: departing Houston the average ATFM delay is 5.5 min (atfm); arriving into London it is 1.8 min (atfm).
Across 22 tracked IAH-LHR flights, 74% left on time with an average delay of 75 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) | 87% | 20 min | 1.2% |
| United Airlines (UA) | 83% | 5 min | 1.3% |
| American Airlines (AA) | 79% | 6 min | 1.1% |
| Lufthansa Cargo (LH) | 74% | 21 min | 0.0% |
| British Airways (BA) | 66% | 31 min | 1.3% |
Airlines operating IAH-LHR
Airports
Frequently asked questions about IAH-LHR
The flight from Houston (IAH) to London (LHR) takes 8h 48m on average. That is the median time recorded across 1 scheduled flight on this leg; the actual time varies by a few minutes with wind, routing and take-off queues.
On the Houston (IAH) -> London (LHR) route, on-time performance is 74% with an average delay of 75 minutes, based on 22 tracked flights.
The cancellation rate on Houston-London is 0.00% across 22 monitored flights.
The route is operated by 5 airlines: American Airlines, British Airways, 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.
