Flight UA1939
United Airlines flight UA1939
Looking for UA1939 in the airâŚ
Alerts at this flight's airports
Los Angeles (LAX) to Newark (EWR)
Historically, this flight arrives 15+ minutes late 23% of the time, and when it is late the delay averages 85 minutes. It was cancelled 2.3% of the time.
- On-time arrivals
- 76.8%
- Less than 15 minutes late
- Cancelled
- 2.3%
- Of scheduled flights
- Average delay when late
- 85 min
- Flights arriving 15+ minutes late
- Flights tracked
- 171
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 48%
- Late-arriving aircraft 31%
- Airline (crew, maintenance, cleaning) 21%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to Newark (EWR)
Historically, this flight arrives 15+ minutes late 0% of the time. It was cancelled 13.3% of the time.
- On-time arrivals
- 100.0%
- Less than 15 minutes late
- Cancelled
- 13.3%
- Of scheduled flights
- Average delay when late
- â
- Flights arriving 15+ minutes late
- Flights tracked
- 30
- Scheduled flights in the period
San Francisco (SFO) to Indianapolis (IND)
Historically, this flight arrives 15+ minutes late 7% of the time, and when it is late the delay averages 79 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 93.1%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 79 min
- Flights arriving 15+ minutes late
- Flights tracked
- 30
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 89%
- Late-arriving aircraft 11%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Columbus (CMH)
Historically, this flight arrives 15+ minutes late 19% of the time, and when it is late the delay averages 51 minutes. It was cancelled 3.6% of the time.
- On-time arrivals
- 80.8%
- Less than 15 minutes late
- Cancelled
- 3.6%
- Of scheduled flights
- Average delay when late
- 51 min
- Flights arriving 15+ minutes late
- Flights tracked
- 28
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 89%
- Airline (crew, maintenance, cleaning) 10%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Indianapolis (IND) to Dulles (IAD)
Historically, this flight arrives 15+ minutes late 12% of the time, and when it is late the delay averages 33 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 88.5%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 33 min
- Flights arriving 15+ minutes late
- Flights tracked
- 26
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 69%
- Airline (crew, maintenance, cleaning) 31%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Dulles (IAD) to Columbus (CMH)
Historically, this flight arrives 15+ minutes late 13% of the time, and when it is late the delay averages 72 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 87.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 72 min
- Flights arriving 15+ minutes late
- Flights tracked
- 23
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 58%
- Extreme weather 16%
- Airline (crew, maintenance, cleaning) 13%
- Air traffic control & airport 13%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Portland (PDX) to San Francisco (SFO)
Historically, this flight arrives 15+ minutes late 52% of the time, and when it is late the delay averages 63 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 47.6%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 21
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 71%
- Late-arriving aircraft 19%
- Airline (crew, maintenance, cleaning) 11%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Orlando (MCO)
Only 12 flights on record, which is too few for reliable odds.
- On-time arrivals
- 50.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 50 min
- Flights arriving 15+ minutes late
- Flights tracked
- 12
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 81%
- Late-arriving aircraft 19%
- Airline (crew, maintenance, cleaning) 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Los Angeles (LAX)
Only 6 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
- 6
- Scheduled flights in the period
Miami (MIA) to Newark (EWR)
Only 1 flight 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
- 1
- Scheduled flights in the period
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 88.6% | 35 |
| October 2025 | 85.7% | 51 |
| November 2025 | 66.7% | 30 |
| December 2025 | 74.2% | 31 |
| January 2026 | 100.0% | 5 |
| February 2026 | 100.0% | 18 |
| March 2026 | 63.3% | 32 |
| April 2026 | 88.2% | 35 |
| May 2026 | 92.6% | 29 |
| June 2026 | 95.7% | 26 |
| July 2026 | 87.5% | 17 |
| August 2026 | 50.0% | 39 |
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