UA636
UA636 (United Airlines) is a multi-stop service on 15 routes, busiest Chicago to Burlington. Of 971 departures recorded from October 2024 to July 2026, 77.5% left on time, according to the US BTS.
- On-time departures77.5%of 971 flights
- Average delay16.6 min
- July 202661▼ 1.6%vs July 2025
- Cancelled1.0%
- Legs flown under this number15
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 62 | ▲ 100.0% |
| February | 28 | 56 | ▲ 100.0% |
| March | 31 | 62 | ▲ 100.0% |
| April | 30 | 35 | ▲ 16.7% |
| May | 38 | 42 | ▲ 10.5% |
| June | 56 | 60 | ▲ 7.1% |
| July | 62 | 61 | ▼ 1.6% |
| August | 44 | – | – |
| September | 59 | – | – |
| October | 56 | – | in progress |
| November | 29 | – | – |
| December | 61 | – | – |
| Year to date (Jan–Jul) | 276 | 378 | ▲ 37.0% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 71.0% | 68.9% | ▼ 3.0% |
| February | 92.9% | 71.4% | ▼ 23.1% |
| March | 87.1% | 63.9% | ▼ 26.6% |
| April | 96.7% | 62.9% | ▼ 35.0% |
| May | 76.3% | 80.5% | ▲ 5.5% |
| June | 74.1% | 81.0% | ▲ 9.4% |
| July | 82.0% | 72.1% | ▼ 12.0% |
| August | 88.6% | – | – |
| September | 81.4% | – | – |
| October | 83.9% | – | in progress |
| November | 75.0% | – | – |
| December | 71.7% | – | – |
| Year-to-date average (Jan–Jul) | 82.9% | 71.5% | ▼ 13.7% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 2 | 2 | 0.0% |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 3 | 5 | ▲ 66.7% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.0% 961
- Cancelled 1.0% 10
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ORD BTV Chicago O'Hare International Airport – Patrick Leahy Burlington International Airport | 1,225 | 22.4 min | 71.4% | 327 |
| IAD LAS Washington Dulles International Airport – Harry Reid International Airport | 3,316 | 9.1 min | 88.9% | 135 |
| HDN ORD Yampa Valley Airport – Chicago O'Hare International Airport | 1,620 | 31.3 min | 69.7% | 90 |
| IAH SAT George Bush Intercontinental Airport – San Antonio International Airport | 306 | 17.7 min | 71.3% | 82 |
| MSO ORD Missoula Montana Airport – Chicago O'Hare International Airport | 2,139 | 17.3 min | 87.0% | 72 |
| PNS ORD Pensacola International Airport – Chicago O'Hare International Airport | 1,281 | 6.2 min | 84.6% | 66 |
| PHX IAH Phoenix Sky Harbor International Airport – George Bush Intercontinental Airport | 1,620 | 2.7 min | 90.6% | 54 |
| LAX CLE Los Angeles International Airport – Cleveland Hopkins International Airport | 3,296 | 5.0 min | 79.1% | 43 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 26 | 26 | 88.5% | 0 |
| November 2024 | 11 | 11 | 81.8% | 0 |
| December 2024 | 31 | 31 | 80.7% | 0 |
| January 2025 | 31 | 31 | 71.0% | 0 |
| February 2025 | 28 | 28 | 92.9% | 0 |
| March 2025 | 31 | 31 | 87.1% | 0 |
| April 2025 | 30 | 30 | 96.7% | 0 |
| May 2025 | 38 | 38 | 76.3% | 0 |
| June 2025 | 56 | 54 | 74.1% | 2 |
| July 2025 | 62 | 61 | 82.0% | 1 |
| August 2025 | 44 | 44 | 88.6% | 0 |
| September 2025 | 59 | 59 | 81.4% | 0 |
| October 2025 | 56 | 56 | 83.9% | 0 |
| November 2025 | 29 | 28 | 75.0% | 1 |
| December 2025 | 61 | 60 | 71.7% | 1 |
| January 2026 | 62 | 61 | 68.9% | 1 |
| February 2026 | 56 | 56 | 71.4% | 0 |
| March 2026 | 62 | 61 | 63.9% | 1 |
| April 2026 | 35 | 35 | 62.9% | 0 |
| May 2026 | 42 | 41 | 80.5% | 1 |
| June 2026 | 60 | 58 | 81.0% | 2 |
| July 2026 | 61 | 61 | 72.1% | 0 |