Flight UA637
United Airlines flight UA637
Looking for UA637 in the airâŚ
Alerts at this flight's airports
Dulles (IAD) to Austin (AUS)
Historically, this flight arrives 15+ minutes late 8% of the time, and when it is late the delay averages 67 minutes. It was cancelled 0.8% of the time.
- On-time arrivals
- 92.5%
- Less than 15 minutes late
- Cancelled
- 0.8%
- Of scheduled flights
- Average delay when late
- 67 min
- Flights arriving 15+ minutes late
- Flights tracked
- 254
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Air traffic control & airport 41%
- Airline (crew, maintenance, cleaning) 11%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Austin (AUS) to Los Angeles (LAX)
Historically, this flight arrives 15+ minutes late 13% of the time, and when it is late the delay averages 81 minutes. It was cancelled 1.1% of the time.
- On-time arrivals
- 87.4%
- Less than 15 minutes late
- Cancelled
- 1.1%
- Of scheduled flights
- Average delay when late
- 81 min
- Flights arriving 15+ minutes late
- Flights tracked
- 89
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 70%
- Late-arriving aircraft 14%
- Air traffic control & airport 11%
- Extreme weather 6%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Portland (PWM) to Chicago (ORD)
Historically, this flight arrives 15+ minutes late 29% of the time, and when it is late the delay averages 108 minutes. It was cancelled 2.9% of the time.
- On-time arrivals
- 70.6%
- Less than 15 minutes late
- Cancelled
- 2.9%
- Of scheduled flights
- Average delay when late
- 108 min
- Flights arriving 15+ minutes late
- Flights tracked
- 35
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 85%
- Late-arriving aircraft 10%
- Airline (crew, maintenance, cleaning) 5%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Syracuse (SYR) to Dulles (IAD)
Historically, this flight arrives 15+ minutes late 11% of the time, and when it is late the delay averages 88 minutes. It was cancelled 5.0% of the time.
- On-time arrivals
- 89.5%
- Less than 15 minutes late
- Cancelled
- 5.0%
- Of scheduled flights
- Average delay when late
- 88 min
- Flights arriving 15+ minutes late
- Flights tracked
- 20
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 71%
- Air traffic control & airport 29%
- Late-arriving aircraft 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Medford (MFR)
Only 9 flights on record, which is too few for reliable odds.
- On-time arrivals
- 66.7%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 62 min
- Flights arriving 15+ minutes late
- Flights tracked
- 9
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 59%
- Airline (crew, maintenance, cleaning) 37%
- Air traffic control & airport 4%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Myrtle Beach (MYR) to Denver (DEN)
Only 7 flights on record, which is too few for reliable odds.
- On-time arrivals
- 100.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- â
- Flights arriving 15+ minutes late
- Flights tracked
- 7
- Scheduled flights in the period
Los Angeles (LAX) to Phoenix (PHX)
Only 5 flights on record, which is too few for reliable odds.
- On-time arrivals
- 80.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 26 min
- Flights arriving 15+ minutes late
- Flights tracked
- 5
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 100%
- Airline (crew, maintenance, cleaning) 0%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Dulles (IAD) to Hayden (HDN)
Only 3 flights on record, which is too few for reliable odds.
- On-time arrivals
- 100.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- â
- Flights arriving 15+ minutes late
- Flights tracked
- 3
- Scheduled flights in the period
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 96.2% | 26 |
| October 2025 | 92.6% | 27 |
| November 2025 | 100.0% | 25 |
| December 2025 | 90.0% | 31 |
| January 2026 | 94.4% | 19 |
| February 2026 | 90.5% | 21 |
| March 2026 | 90.9% | 33 |
| April 2026 | 90.6% | 65 |
| May 2026 | 89.9% | 71 |
| June 2026 | 69.0% | 30 |
| July 2026 | 90.0% | 31 |
| August 2026 | 79.1% | 43 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 â August 2026. Covers flights operated by reporting U.S. carriers. About our data