How often is Delta Air Lines delayed at Heathrow?
56 flights a year cross the 3-hour compensation line
Each one worth £520 per passenger.
In the last 12 months, Delta Air Lines operated 7,025 flights at Heathrow, and 0.8% were 3 or more hours late, the threshold where £520 per passenger becomes payable.
Punctuality is up on last year: 80.2% of flights ran on time against 76.1% in the twelve months before, and the average delay fell from 15.9 to 12 minutes.
| Delta Air Lines at Heathrow, last 12 months | Figure | vs year before |
|---|---|---|
| Flights at Heathrow | 7,025 | was 6,957 |
| Ran on time (within 15 min) | 80.2% | ▲ was 76.1% |
| Average delay | 12 min | ▼ was 15.9 min |
| 3h+ late (compensation threshold) | 0.8% | - |
| Cancelled | 1.4% | - |
| Flights 3h+ late (a year) | 56 flights/year | - |
The CAA's figures combine arrivals and departures, so this covers traffic both ways, not departures alone.
Delta Air Lines at Heathrow, month by month
Worst month: December 2025, averaging 18.8 minutes.
Delta Air Lines' busiest routes at Heathrow
| Destination | 3h+ % | 3h+ delay pays |
|---|---|---|
| Atlanta | 0.6% | £520 |
| New York (John F Kennedy) | 1.6% | £520 |
| Detroit | 0.8% | £520 |
| Minneapolis-St Paul | 0.5% | £520 |
| Boston | 0.6% | £520 |
| Seattle (Tacoma) | 0.5% | £520 |
| Salt Lake City | 0.5% | £520 |
Your rights on this route
Heathrow is a UK airport, so every flight departing from it is covered by UK261, whichever airline you fly with. Delays of 3 or more hours pay £220 to £520 per passenger depending on how far you were flying, and the table above gives the exact figure for each of these routes. See the full breakdown on the 3-hour rule. If the flight is cancelled instead of delayed, broadly the same amounts apply under different conditions. See cancelled flight compensation.
Flying soon? We'll watch your flight
Enter your flight and email. The moment it goes 3+ hours late or gets cancelled, we email you what you're owed and how to claim it. Free, one email, no spam.
Other airlines at Heathrow
Source: UK Civil Aviation Authority punctuality statistics, July 2025 to June 2026. Analysis by CheckFlightCompensation; the CAA is credited as the data source as its publication conditions require. Figures cover the 25 largest UK airports.