How often are flights between London and Denver on time?

80% of 1,851 flights were on time (within 15 minutes) over the last 12 months of UK Civil Aviation Authority figures, and 0.6% were cancelled.

Which airline is most punctual between London and Denver?

United Airlines, with 82.4% on time. British Airways was the least punctual at 76.1%.

LHR to DEN

London to Denver flights

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

Flights from London Heathrow (LHR) to Denver (DEN) cover 7,496 km. 1,851 flights flew between them in the last 12 months of UK Civil Aviation Authority figures; 80% were on time across 2 airlines.

1,851

flights, August 2025 to July 2026

80%

on time (within 15 min)

0.6%

cancelled

+12 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	1,141	82%	0.8%	11 min
British Airways	710	76%	0.3%	14 min

Month by month

Over the last 12 months, London and Denver ran best in February 2026 (89.1% on time) and worst in May 2026 (72.3%).

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%	1.1%	184
September 2025	78%	1.1%	178
October 2025	88%	0%	174
November 2025	85%	0.9%	109
December 2025	77%	0.8%	121
January 2026	76%	0%	118
February 2026	89%	0%	110
March 2026	85%	0.8%	129
April 2026	87%	1.1%	178
May 2026	72%	1.1%	184
June 2026	78%	0%	180
July 2026	74%	0%	186

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 Denver (DEN).

Questions and answers

How often are flights between London and Denver on time?: 80% of 1,851 flights were on time (within 15 minutes) over the last 12 months of UK Civil Aviation Authority figures, and 0.6% were cancelled.
Which airline is most punctual between London and Denver?: United Airlines, with 82.4% on time. British Airways was the least punctual at 76.1%.
What is the best month to fly between London and Denver?: Over the last 12 months, London and Denver ran best in February 2026 (89.1% on time) and worst in May 2026 (72.3%).

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