Flight number record
UA 1372
United Airlines · San Francisco to Boston
- Route
- SFO → BOS
- Departs
- 12:25
- Flights
- 340
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1372, check with United Airlines.
UA 1372 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 340 flights, with a median arrival 6 minutes early.
Key figures
On time
74.3%
Arrivals under 15 minutes late, of 335 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
1.18%
National rate is 1.89%
1 hour+ late
13.1%
National rate is 8.3%
These figures cover 340 flights between September 2025 and August 2026. Beyond the headline rate, 13.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 1372 flies
UA 1372 flies SFO to BOS without a single fixed slot. Its most common scheduled departure was 12:25, used on 82 of 340 flights, with 13:00 (71 flights) and 15:10 (55 flights) next.
- Departs 12:2582 flights24.1%
- Departs 13:0071 flights20.9%
- Departs 15:1055 flights16.2%
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 12:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1372 runs 4 points worse at 74.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 1372 next to SFO to BOS
Every carrier on SFO to BOS combined arrived on time 74.5% of the time across 4,815 flights, so UA 1372 is about level with it. United flew 1,939 flights on the same city pair under all its flight numbers, including this one, and those ran 78.5% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1372thin sample | 340 | 74.3% | 79 min | 1.18% | C |
| All United Airlines on SFO–BOS | 1,939 | 78.5% | 73 min | 1.08% | B |
| All carriers on SFO–BOS | 4,815 | 74.5% | 74 min | 1.81% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1372 quarter by quarter
UA 1372 did not run the same all year. Its best quarter was Oct–Dec 2025 at 84.4% on time and its weakest Jul–Sep 2026 at 58.1%, a swing of 26 points on roughly 68 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 flights80.0%
- Oct–Dec 202591 flights84.4%
- Jan–Mar 202666 flights79.0%
- Apr–Jun 202691 flights70.3%
- Jul–Sep 202662 flights58.1%
Scale runs 50% to 90%.
By weekday, UA 1372 did best on Saturday at 81.2% on time and worst on Sunday at 68.1%. Each day rests on about 49 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1372 runs when it is late
UA 1372 often beats the schedule: 121 of 335 completed flights, 36%, arrived 15 minutes or more early. When UA 1372 is late it tends to be very late: 44 of its 86 late arrivals were an hour or more behind, and 23 were two hours or more.
- 15+ min early121 flights36.1%
- Within 15 min128 flights38.2%
- 15–29 min late22 flights6.6%
- 30–59 min late20 flights6.0%
- 1–2 hours late21 flights6.3%
- 2+ hours late23 flights6.9%
Scale runs 0% to 100%.
Share of 335 completed flights by arrival against schedule.
25 of 99 late departures made up the time and arrived on time, 25% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for UA 1372
The latest arrival of the period was on 28 August 2026, 4 hours 47 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On four of the five worst days the largest share was filed as national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 August 2026 | 4 hours 47 minutes | Carrier |
| 6 November 2025 | 4 hours | National Airspace System |
| 18 June 2026 | 3 hours 28 minutes | National Airspace System |
| 7 July 2026 | 3 hours 23 minutes | National Airspace System |
| 30 October 2025 | 3 hours 21 minutes | National Airspace System |
Delay causes
Why UA 1372 runs late
National Airspace System accounts for 55% of the 6,771 delay minutes carriers reported here, and the remaining four split what is left.
- 55%National Airspace System
- 29%Late-arriving aircraft
- 16%Carrier
55% 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 3,722 minutes out of 6,771, against a national NAS share of 21%. The split is drawn from 6,771 delay minutes reported on UA 1372.
Cancellations sit at 1.18% against a national 1.89%, which is ordinary. Diversions add another 0.29%.
Connections and routes
What a delay on this flight costs
13.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 2,704 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on five other city pairs in the data, including LAX to SFO (153), SEA to SFO (50) and IAD to JAX (24), but none flew often enough under UA 1372 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to BOS only.
One caution: this is a thin sample. 340 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 1372
For a booking, UA 1372 is a flight to put a long connection behind. 13.1% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- SFO to BOS, every carrier and departure
- BOS to SFO, the return direction
- Delta Air Lines 400 on the same route88.5%
- JetBlue Airways 734 on the same route74.1%
- United Airlines 1665 on the same route83.7%
- JetBlue Airways 1734 on the same route66.2%
- United Airlines 2647 on the same route81.8%
- United Airlines 2356 on the same route63.0%
- San Francisco International (SFO) delay statistics
- Boston Logan International (BOS) 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
- The best time of day to fly, according to 7.05 million flight records
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.