UA637
UA637 (United Airlines) is a multi-stop service on 12 routes, busiest Dulles to Austin. Of 692 departures recorded from October 2024 to July 2026, 91.5% left on time, according to the US BTS.
- On-time departures91.5%of 692 flights
- Average delay1.8 min
- July 202631▲ 0.0%vs July 2025
- Cancelled1.2%
- Legs flown under this number12
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 | 31 | 19 | ▼ 38.7% |
| February | 28 | 21 | ▼ 25.0% |
| March | 27 | 33 | ▲ 22.2% |
| April | 26 | 65 | ▲ 150.0% |
| May | 31 | 71 | ▲ 129.0% |
| June | 28 | 30 | ▲ 7.1% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 26 | – | – |
| October | 27 | – | in progress |
| November | 25 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 202 | 270 | ▲ 33.7% |
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 | 90.0% | 100.0% | ▲ 11.1% |
| February | 96.3% | 90.5% | ▼ 6.0% |
| March | 88.9% | 84.9% | ▼ 4.5% |
| April | 92.3% | 90.8% | ▼ 1.7% |
| May | 93.6% | 92.8% | ▼ 0.9% |
| June | 85.2% | 79.3% | ▼ 6.9% |
| July | 93.6% | 86.7% | ▼ 7.4% |
| August | 90.3% | – | – |
| September | 100.0% | – | – |
| October | 96.3% | – | in progress |
| November | 100.0% | – | – |
| December | 90.3% | – | – |
| Year-to-date average (Jan–Jul) | 91.4% | 89.3% | ▼ 2.3% |
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 | 1 | 1 | 0.0% |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 2 | – |
| June | 1 | 1 | 0.0% |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 5 | ▲ 66.7% |
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% 684
- Cancelled 1.2% 8
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| IAD AUS Washington Dulles International Airport – Austin Bergstrom International Airport | 2,084 | -1.1 min | 94.9% | 374 |
| DFW EWR Dallas Fort Worth International Airport – Newark Liberty International Airport | 2,205 | 0.8 min | 91.1% | 148 |
| AUS LAX Austin Bergstrom International Airport – Los Angeles International Airport | 1,995 | 7.5 min | 85.5% | 77 |
| PWM ORD Portland International Jetport – Chicago O'Hare International Airport | 1,444 | 21.1 min | 79.4% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 29 | 29 | 89.7% | 0 |
| December 2024 | 31 | 31 | 90.3% | 0 |
| January 2025 | 31 | 30 | 90.0% | 1 |
| February 2025 | 28 | 27 | 96.3% | 1 |
| March 2025 | 27 | 27 | 88.9% | 0 |
| April 2025 | 26 | 26 | 92.3% | 0 |
| May 2025 | 31 | 31 | 93.6% | 0 |
| June 2025 | 28 | 27 | 85.2% | 1 |
| July 2025 | 31 | 31 | 93.6% | 0 |
| August 2025 | 31 | 31 | 90.3% | 0 |
| September 2025 | 26 | 26 | 100.0% | 0 |
| October 2025 | 27 | 27 | 96.3% | 0 |
| November 2025 | 25 | 25 | 100.0% | 0 |
| December 2025 | 31 | 31 | 90.3% | 0 |
| January 2026 | 19 | 18 | 100.0% | 1 |
| February 2026 | 21 | 21 | 90.5% | 0 |
| March 2026 | 33 | 33 | 84.9% | 0 |
| April 2026 | 65 | 65 | 90.8% | 0 |
| May 2026 | 71 | 69 | 92.8% | 2 |
| June 2026 | 30 | 29 | 79.3% | 1 |
| July 2026 | 31 | 30 | 86.7% | 1 |