UA644
This is a historical record of departures already flown, not a forecast for your flight.
86.6%
UA644, operated by United Airlines, flies 15 different airport pairs — it is a multi-leg service. Across all 1,044 recorded departures, 86.6% left on time; the legs differ and are listed below.
Because this number covers several legs, the headline figure is an average across all of them. Read the leg table for the one you are flying.
These charts combine all legs flown under this number. Changes in the mix of legs can affect the monthly figures; consult the leg table below.
On-time departures by month
On time means departing no more than 15 minutes after schedule. Monthly punctuality uses only non-cancelled flights with a recorded departure delay; flights with missing times are excluded. Each month reflects the records available from the source.
according to us_bts_otp · 2024-09 → 2026-06
Recorded departures by month
according to us_bts_otp · 2024-09 → 2026-06
Cancellation share
- Not cancelled 99.8% 1,042
- Cancelled 0.2% 2
Share of all recorded flights over the period shown, including every leg. Not cancelled does not necessarily mean on time.
according to us_bts_otp · 2024-09-01 → 2026-06-30
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| September 2024 | 30 | 30 | 96.7% | 0 |
| October 2024 | 36 | 36 | 80.6% | 0 |
| November 2024 | 59 | 59 | 78.0% | 0 |
| December 2024 | 48 | 48 | 83.3% | 0 |
| January 2025 | 31 | 31 | 71.0% | 0 |
| February 2025 | 28 | 28 | 75.0% | 0 |
| March 2025 | 33 | 33 | 87.9% | 0 |
| April 2025 | 30 | 30 | 70.0% | 0 |
| May 2025 | 41 | 41 | 85.4% | 0 |
| June 2025 | 85 | 85 | 90.6% | 0 |
| July 2025 | 62 | 60 | 88.3% | 2 |
| August 2025 | 71 | 71 | 87.3% | 0 |
| September 2025 | 83 | 83 | 80.7% | 0 |
| October 2025 | 31 | 31 | 93.6% | 0 |
| November 2025 | 30 | 30 | 100.0% | 0 |
| December 2025 | 45 | 45 | 84.4% | 0 |
| January 2026 | 36 | 36 | 86.1% | 0 |
| February 2026 | 45 | 45 | 91.1% | 0 |
| March 2026 | 38 | 38 | 86.8% | 0 |
| April 2026 | 60 | 60 | 95.0% | 0 |
| May 2026 | 62 | 62 | 91.9% | 0 |
| June 2026 | 60 | 60 | 91.7% | 0 |
Legs flown under this number
9| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN PDX Denver International Airport – Portland International Airport | 1,592 | 7.3 min | 85.2% | 532 |
| PDX SFO Portland International Airport – San Francisco International Airport | 886 | 19.4 min | 81.6% | 136 |
| DFW DEN Dallas Fort Worth International Airport – Denver International Airport | 1,032 | -0.2 min | 93.6% | 62 |
| BNA IAH Nashville International Airport – George Bush Intercontinental Airport | 1,057 | -1.9 min | 94.2% | 52 |
| LGA DEN LaGuardia Airport – Denver International Airport | 2,600 | 2.3 min | 88.9% | 38 |
| MIA DEN Miami International Airport – Denver International Airport | 2,749 | 1.5 min | 89.2% | 37 |
| SFO EUG San Francisco International Airport – Eugene Airport | 727 | 21.1 min | 78.4% | 37 |
| SFO SAN San Francisco International Airport – San Diego International Airport | 719 | 14.2 min | 77.8% | 36 |
| SFO PIT San Francisco International Airport – Pittsburgh International Airport | 3,618 | -0.7 min | 97.0% | 33 |