DL541
DL541 (Delta Air Lines) is a multi-stop service on 4 routes, busiest Seattle to Dulles. Of 663 departures recorded from October 2024 to July 2026, 75.9% left on time, according to the US BTS.
- On-time departures75.9%of 663 flights
- Average delay17.6 min
- July 202631▲ 0.0%vs July 2025
- Cancelled1.2%
- Legs flown under this number4
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 | 44 | 31 | ▼ 29.5% |
| February | 42 | 28 | ▼ 33.3% |
| March | 33 | 31 | ▼ 6.1% |
| April | 30 | 30 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 241 | 212 | ▼ 12.0% |
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 | 70.5% | 66.7% | ▼ 5.4% |
| February | 72.5% | 74.1% | ▲ 2.2% |
| March | 71.9% | 73.3% | ▲ 2.0% |
| April | 80.0% | 96.6% | ▲ 20.7% |
| May | 74.2% | 87.1% | ▲ 17.4% |
| June | 72.4% | 70.0% | ▼ 3.3% |
| July | 93.6% | 67.7% | ▼ 27.6% |
| August | 77.4% | – | – |
| September | 86.7% | – | – |
| October | 74.2% | – | in progress |
| November | 73.3% | – | – |
| December | 48.4% | – | – |
| Year-to-date average (Jan–Jul) | 76.4% | 76.5% | ▲ 0.1% |
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 | 2 | 1 | ▼ 50.0% |
| March | 1 | 1 | 0.0% |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 4 | 0.0% |
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 98.8% 655
- Cancelled 1.2% 8
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SEA IAD Seattle–Tacoma International Airport – Washington Dulles International Airport | 3,702 | 15.0 min | 77.9% | 538 |
| AUS BOS Austin Bergstrom International Airport – Boston Logan International Airport | 2,729 | 18.0 min | 76.3% | 61 |
| BOS AUS Boston Logan International Airport – Austin Bergstrom International Airport | 2,729 | 42.1 min | 66.0% | 48 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 87.5% | 0 |
| November 2024 | 24 | 24 | 87.5% | 0 |
| December 2024 | 17 | 17 | 76.5% | 0 |
| January 2025 | 44 | 44 | 70.5% | 0 |
| February 2025 | 42 | 40 | 72.5% | 2 |
| March 2025 | 33 | 32 | 71.9% | 1 |
| April 2025 | 30 | 30 | 80.0% | 0 |
| May 2025 | 31 | 31 | 74.2% | 0 |
| June 2025 | 30 | 29 | 72.4% | 1 |
| July 2025 | 31 | 31 | 93.6% | 0 |
| August 2025 | 31 | 31 | 77.4% | 0 |
| September 2025 | 30 | 30 | 86.7% | 0 |
| October 2025 | 31 | 31 | 74.2% | 0 |
| November 2025 | 30 | 30 | 73.3% | 0 |
| December 2025 | 31 | 31 | 48.4% | 0 |
| January 2026 | 31 | 30 | 66.7% | 1 |
| February 2026 | 28 | 27 | 74.1% | 1 |
| March 2026 | 31 | 30 | 73.3% | 1 |
| April 2026 | 30 | 29 | 96.6% | 1 |
| May 2026 | 31 | 31 | 87.1% | 0 |
| June 2026 | 30 | 30 | 70.0% | 0 |
| July 2026 | 31 | 31 | 67.7% | 0 |