How often are flights between London and Houston on time?

71.4% of 2,689 flights were on time (within 15 minutes) over the last 12 months of UK Civil Aviation Authority figures, and 1.5% were cancelled.

Which airline is most punctual between London and Houston?

United Airlines, with 71.4% on time. British Airways was the least punctual at 71.3%.

LHR to IAH

London to Houston flights

Name: London to Houston (LHR-IAH) flights: on-time record
Creator: TripStow
License: https://tripstow.com/notices

Flights from London Heathrow (LHR) to Houston (IAH) cover 7,763 km. 2,689 flights flew between them in the last 12 months of UK Civil Aviation Authority figures; 71% were on time across 2 airlines.

2,689

flights, August 2025 to July 2026

71%

on time (within 15 min)

1.5%

cancelled

+17 min

average delay

Both directions together. On time means within 15 minutes of schedule, counted over every scheduled flight to and from the UK airport, including cancelled ones (the CAA's definition).

Airlines on this route

Airline	Flights	On time	Cancelled	Average delay
United Airlines	1,450	71%	0.6%	16 min
British Airways	1,239	71%	2.5%	18 min

Month by month

Over the last 12 months, London and Houston ran best in May 2026 (78.4% on time) and worst in November 2025 (62%).

Share of flights on time, by month (UK Civil Aviation Authority). Green is the best month, orange the worst.

See the figures

Month	On time	Cancelled	Flights
August 2025	76%	0.4%	223
September 2025	78%	0.9%	230
October 2025	70%	3%	237
November 2025	62%	0.9%	213
December 2025	65%	0.9%	219
January 2026	67%	2.8%	211
February 2026	77%	1.6%	190
March 2026	69%	0%	218
April 2026	77%	2.3%	222
May 2026	78%	1.2%	245
June 2026	69%	1.7%	237
July 2026	67%	2%	244

Source: UK Civil Aviation Authority punctuality statistics, August 2025 to July 2026. Contains UK Civil Aviation Authority data. Figures describe the past and do not predict a future flight.

More about London Heathrow (LHR) and Houston (IAH).

Questions and answers

How often are flights between London and Houston on time?: 71.4% of 2,689 flights were on time (within 15 minutes) over the last 12 months of UK Civil Aviation Authority figures, and 1.5% were cancelled.
Which airline is most punctual between London and Houston?: United Airlines, with 71.4% on time. British Airways was the least punctual at 71.3%.
What is the best month to fly between London and Houston?: Over the last 12 months, London and Houston ran best in May 2026 (78.4% on time) and worst in November 2025 (62%).

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