DL1520
DL1520 (Delta Air Lines) is a multi-stop service on 15 routes, busiest Chicago to Detroit. Of 719 departures recorded from October 2024 to July 2026, 85.7% left on time, according to the US BTS.
- On-time departures85.7%of 719 flights
- Average delay4.0 min
- July 202631▲ 29.2%vs July 2025
- Cancelled1.0%
- Legs flown under this number15
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 54 | 36 | ▼ 33.3% |
| February | 52 | 50 | ▼ 3.8% |
| March | 57 | 38 | ▼ 33.3% |
| April | 41 | 22 | ▼ 46.3% |
| May | 46 | 28 | ▼ 39.1% |
| June | 12 | 30 | ▲ 150.0% |
| July | 24 | 31 | ▲ 29.2% |
| August | 12 | – | – |
| September | 17 | – | – |
| October | 23 | – | in progress |
| November | 20 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 286 | 235 | ▼ 17.8% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 81.5% | 88.6% | ▲ 8.7% |
| February | 84.6% | 82.0% | ▼ 3.1% |
| March | 91.2% | 92.1% | ▲ 1.0% |
| April | 82.9% | 86.4% | ▲ 4.1% |
| May | 95.7% | 89.3% | ▼ 6.6% |
| June | 91.7% | 96.6% | ▲ 5.3% |
| July | 70.8% | 79.3% | ▲ 12.0% |
| August | 83.3% | – | – |
| September | 64.7% | – | – |
| October | 82.6% | – | in progress |
| November | 75.0% | – | – |
| December | 69.2% | – | – |
| Year-to-date average (Jan–Jul) | 85.5% | 87.7% | ▲ 2.6% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 2 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 3 | – | – |
| Year to date (Jan–Jul) | 0 | 4 |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.0% 712
- Cancelled 1.0% 7
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ORD DTW Chicago O'Hare International Airport – Detroit Metropolitan Wayne County Airport | 376 | -1.7 min | 90.9% | 175 |
| DTW ORD Detroit Metropolitan Wayne County Airport – Chicago O'Hare International Airport | 376 | 2.7 min | 88.0% | 166 |
| PHX SLC Phoenix Sky Harbor International Airport – Salt Lake City International Airport | 818 | 15.1 min | 75.0% | 89 |
| MIA JFK Miami International Airport – John F. Kennedy International Airport | 1,757 | 1.6 min | 86.5% | 55 |
| PDX SEA Portland International Airport – Seattle–Tacoma International Airport | 208 | -3.9 min | 91.7% | 36 |
| ATL MEM Hartsfield Jackson Atlanta International Airport – Frederick W. Smith International Airport | 533 | 7.5 min | 75.0% | 34 |
| MCO AUS Orlando International Airport – Austin Bergstrom International Airport | 1,596 | 10.1 min | 90.3% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 24 | 24 | 100.0% | 0 |
| November 2024 | 28 | 28 | 92.9% | 0 |
| December 2024 | 45 | 45 | 86.7% | 0 |
| January 2025 | 54 | 54 | 81.5% | 0 |
| February 2025 | 52 | 52 | 84.6% | 0 |
| March 2025 | 57 | 57 | 91.2% | 0 |
| April 2025 | 41 | 41 | 82.9% | 0 |
| May 2025 | 46 | 46 | 95.7% | 0 |
| June 2025 | 12 | 12 | 91.7% | 0 |
| July 2025 | 24 | 24 | 70.8% | 0 |
| August 2025 | 12 | 12 | 83.3% | 0 |
| September 2025 | 17 | 17 | 64.7% | 0 |
| October 2025 | 23 | 23 | 82.6% | 0 |
| November 2025 | 20 | 20 | 75.0% | 0 |
| December 2025 | 29 | 26 | 69.2% | 3 |
| January 2026 | 36 | 35 | 88.6% | 1 |
| February 2026 | 50 | 50 | 82.0% | 0 |
| March 2026 | 38 | 38 | 92.1% | 0 |
| April 2026 | 22 | 22 | 86.4% | 0 |
| May 2026 | 28 | 28 | 89.3% | 0 |
| June 2026 | 30 | 29 | 96.6% | 1 |
| July 2026 | 31 | 29 | 79.3% | 2 |