Flight number record

UA 1372

United Airlines · San Francisco to Boston

Route: SFO → BOS
Departs: 13:00
Flights: 309
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1372, check with United Airlines.

UA 1372 lands a B, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 309 flights, with a median arrival 8 minutes early.

On time

78.9%

Arrivals under 15 minutes late, of 304 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

1.29%

National rate is 1.81%

1 hour+ late

10.9%

National rate is 8.1%

These figures cover 309 flights between July 2025 and June 2026. Beyond the headline rate, 10.9% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When UA 1372 flies

UA 1372 flies SFO to BOS without a single fixed slot. Its most common scheduled departure was 13:00, used on 71 of 309 flights, with 15:10 (68 flights) and 12:30 (53 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:0071 flights23.0%
Departs 15:1068 flights22.0%
Departs 12:3053 flights17.2%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 13:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1372 runs level with that at 78.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1372 next to SFO to BOS

Every carrier on SFO to BOS combined arrived on time 76.9% of the time across 4,674 flights, so UA 1372 is 2 points ahead of it. United flew 1,866 flights on the same city pair under all its flight numbers, including this one, and those ran 79.1% on time. Across its whole network United Airlines managed 79.0%, close to this flight's figure.

UA 1372 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1372thin sample	309	78.9%	75 min	1.29%	B
All United Airlines on SFO–BOS	1,866	79.1%	73 min	1.02%	B
All carriers on SFO–BOS	4,674	76.9%	74 min	1.35%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	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 Apr–Jun 2026 at 70.3%, a swing of 14 points on roughly 77 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 202561 flights83.6%
Oct–Dec 202591 flights84.4%
Jan–Mar 202666 flights79.0%
Apr–Jun 202691 flights70.3%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1372 did best on Wednesday at 84.1% on time and worst on Thursday at 71.4%. Each day rests on about 44 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1372 runs late

One category carries most of the weight here. National Airspace System accounts for 47% of the 4,768 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
47%
Late-arriving aircraft
39%
Carrier
14%

39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,768 reported delay minutes here, that single category outweighs weather by 39 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,768 delay minutes reported on UA 1372.

Cancellations sit at 1.29% against a national 1.81%, which is ordinary. Diversions add another 0.32%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.9% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 (91), SEA to SFO (50) and EWR to BZN (31), 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. 309 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, read UA 1372 as 78.9% on time with 1.29% cancelled over 309 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures