LHR→PIT

British Airways is the only carrier the DOT report shows on LHR to PIT, with 592 flights and an average of 184 passengers aboard each. A single-carrier route gives a delayed passenger no same-day alternative on the same ticket, which is worth knowing before booking a tight onward connection.

Flights are scheduled departures in the CAA file, operated plus cancelled; on time is within 15 minutes of the planned off-block time. The DOT count below includes the return direction and may differ.

The DOT's international report puts 65 flights on the pair in July 2025, the busiest month of the window, and 29 in February 2026, the thinnest. A summer-to-winter swing of that size means the winter schedule is a different operation: fewer frequencies, so a cancellation leaves a longer wait for the next seat.

Coming the other way, 72.4% of arrivals from Pittsburgh International into London Heathrow reached the gate within 15 minutes of schedule, across 290 flights. 23% arrived more than 15 minutes early, which is normal for an eastbound crossing with the jet stream behind it and a schedule padded for the days it is not. 1.03% of those arrivals were three hours or more late, the figure that decides a compensation claim on the return trip, and 1.7% were cancelled.

EUROCONTROL's figures for London Heathrow as a whole, every airline and every destination: 80.3% of departures and 80.5% of arrivals within 15 minutes of schedule from 1 January to 21 October 2026, with 96.7% of scheduled flights operated. The last seven days ran at 80.8% for departures, in line with the year. Air traffic flow management delay attributed to the airport averaged 1.2 minutes per arriving flight this year, 1.0 over the last week.

Every US route from London Heathrow, and its full punctuality record

Pittsburgh International is scored on this site from the DOT's domestic data: 80.7% of its 42,768 domestic departures arrived on time over the last twelve months, with delayed flights running a little over an hour late, and 2.16% were cancelled. Those are domestic flights, not this route, but an arriving transatlantic flight shares the same runways, the same weather and the same ground delay programmes, so a bad day at PIT reaches a flight from LHR just as surely. The airport's own page has the hour-by-hour and month-by-month detail, and its live FAA status appears above when the FAA has something to say.

Pittsburgh International (PIT) delay statistics, hour by hour and month by month

Every flight that departs London Heathrow falls under UK261, the retained version of the EU regulation, whichever airline flies it and wherever it lands. If it arrives at Pittsburgh International three hours or more late, or is cancelled with under 14 days' notice, and the cause was within the airline's control, each passenger is owed £520 (£260 if the airline got you there under four hours late), on top of rebooking and care. Weather, air traffic control restrictions and strikes outside the airline are the usual exemptions. The return flight from PIT is covered only when the carrier is UK or EU based. The sector is about 3,710 miles, 5,969 km, which puts it in the top distance band.

Delayed three hours or more? Check a claim with Compensair →

Booked blind, LHR to PIT is a C+ route by the departure record, and there is no carrier choice to make. Leave at least two hours for any onward connection at PIT: 6% of departures were an hour or more late, and immigration comes before the connecting flight.

• London Heathrow (LHR): every US route
• Pittsburgh International (PIT) delay statistics
• LHR to JFK, New York (JFK)14,572 flights
• LHR to EWR, Newark (EWR)6,322 flights
• LHR to LAX, Los Angeles (LAX)5,981 flights
• LHR to ORD, Chicago (ORD)5,762 flights
• KEF to PIT, from Reykjavík188 flights
• Every Europe-to-US route and airport

The departure record is the CAA's, measured at London Heathrow; the arrival record for the return leg is also measured at London Heathrow. Nothing here is measured at PIT, where the DOT keeps no record of international flights.