Flight number record
UA 2019
United Airlines · Los Angeles to San Francisco
- Route
- LAX → SFO
- Departs
- 16:10
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2019, check with United Airlines.
UA 2019 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about 50 minutes behind schedule. Build slack into anything you connect to. That rests on 361 flights, with a median arrival 5 minutes late.
The national on-time rate over the same period is 77.3%, so UA 2019 runs 12 points behind the country as a whole. Across a thousand flights that is about 122 extra late arrivals.
Key figures
On time
65.1%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
6.9%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When UA 2019 flies
UA 2019 flies LAX to SFO without a single fixed slot. Its most common scheduled departure was 16:10, used on 128 of 361 flights, with 16:14 (82 flights) and 15:40 (53 flights) next.
- Departs 16:10128 flights35.5%
- Departs 16:1482 flights22.7%
- Departs 15:4053 flights14.7%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 16:10 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 2019 runs 7 points worse at 65.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
UA 2019 next to LAX to SFO
Every carrier on LAX to SFO combined arrived on time 60.1% of the time across 11,437 flights, so UA 2019 is 5 points ahead of it. United flew 3,330 flights on the same city pair under all its flight numbers, including this one, and those ran 62.9% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2019thin sample | 361 | 65.1% | 50 min | 0.00% | C+ |
| All United Airlines on LAX–SFO | 3,330 | 62.9% | 56 min | 0.12% | D+ |
| All carriers on LAX–SFO | 11,437 | 60.1% | 57 min | 0.80% | D+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2019 quarter by quarter
UA 2019 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jul–Sep 2026 at 44.1%, a swing of 39 points on roughly 72 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights83.3%
- Oct–Dec 202592 flights72.8%
- Jan–Mar 202689 flights80.9%
- Apr–Jun 202691 flights49.5%
- Jul–Sep 202659 flights44.1%
Scale runs 35% to 90%.
By weekday, UA 2019 did best on Tuesday at 73.1% on time and worst on Thursday at 51.9%. Each day rests on about 52 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2019 runs when it is late
The 126 late arrivals split 57 under half an hour, 44 between 30 and 60 minutes, and 25 an hour or more.
- 15+ min early88 flights24.4%
- Within 15 min147 flights40.7%
- 15–29 min late57 flights15.8%
- 30–59 min late44 flights12.2%
- 1–2 hours late13 flights3.6%
- 2+ hours late12 flights3.3%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
15 of 90 late departures made up the time and arrived on time, 17% of them. In the other direction, 51 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SFO.
The worst days
Worst days for UA 2019
The latest arrival of the period was on 3 January 2026, 5 hours 43 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 January 2026 | 5 hours 43 minutes | National Airspace System |
| 15 February 2026 | 4 hours 17 minutes | National Airspace System |
| 13 July 2026 | 3 hours 41 minutes | Late-arriving aircraft |
| 19 June 2026 | 3 hours 4 minutes | Carrier |
| 11 April 2026 | 2 hours 54 minutes | National Airspace System |
Delay causes
Why UA 2019 runs late
National Airspace System accounts for 59% of the 6,270 delay minutes carriers reported here, and the remaining four split what is left.
- 59%National Airspace System
- 24%Late-arriving aircraft
- 17%Carrier
59% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,678 minutes out of 6,270, against a national NAS share of 21%. The split is drawn from 6,270 delay minutes reported on UA 2019.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
6.9% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 50 minutes, which a normal layover absorbs.
The same number turns up on eight other city pairs in the data, including SFO to SEA (160), SFO to DEN (82) and TPA to LAX (32), but none flew often enough under UA 2019 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAX to SFO only.
One caution: this is a thin sample. 361 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking UA 2019
For a booking, read UA 2019 as 65.1% on time with 0.00% cancelled over 361 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAX to SFO, every carrier and departure
- SFO to LAX, the return direction
- Delta Air Lines 2267 on the same route44.3%
- Delta Air Lines 1421 on the same route94.1%
- Delta Air Lines 1559 on the same route65.7%
- United Airlines 1791 on the same route55.4%
- Delta Air Lines 1715 on the same route48.3%
- Delta Air Lines 2986 on the same route57.1%
- Los Angeles International (LAX) delay statistics
- San Francisco International (SFO) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.