Flight number record

UA 1074

United Airlines · Boston to San Francisco

Route: BOS → SFO
Departs: 14:00
Flights: 268
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1074, check with United Airlines.

UA 1074 lands a B+, 4 points better than the national rate of 77.6%. Roughly 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 268 flights, with a median arrival 9 minutes early.

On time

81.5%

Arrivals under 15 minutes late, of 265 completed flights

Avg delay

78 min

Across delayed arrivals only, not all flights

Cancelled

0.37%

National rate is 1.81%

1 hour+ late

10.2%

National rate is 8.1%

These figures cover 268 flights between July 2025 and June 2026. Beyond the headline rate, 10.2% 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 1074 flies

UA 1074 flies BOS to SFO without a single fixed slot. Its most common scheduled departure was 14:00, used on 49 of 268 flights, with 11:35 (41 flights) and 13:50 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:0049 flights18.3%
Departs 11:3541 flights15.3%
Departs 13:5037 flights13.8%

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 14:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 1074 runs 9 points better at 81.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1074 next to BOS to SFO

Every carrier on BOS to SFO combined arrived on time 72.6% of the time across 4,676 flights, so UA 1074 is 9 points ahead of it. United flew 1,867 flights on the same city pair under all its flight numbers, including this one, and those ran 76.3% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 3 points.

UA 1074 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1074thin sample	268	81.5%	78 min	0.37%	B+
All United Airlines on BOS–SFO	1,867	76.3%	66 min	1.12%	B
All carriers on BOS–SFO	4,676	72.6%	65 min	1.22%	C
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1074 quarter by quarter

Quarter by quarter UA 1074 held fairly steady: 81.8% in Jul–Sep 2025, 82.7% in Oct–Dec 2025, 85.1% in Jan–Mar 2026 and 78.0% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202555 flights81.8%
Oct–Dec 202554 flights82.7%
Jan–Mar 202668 flights85.1%
Apr–Jun 202691 flights78.0%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1074 did best on Saturday at 87.2% on time and worst on Friday at 71.1%. Each day rests on about 38 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1074 runs late

One category carries most of the weight here. National Airspace System accounts for 51% of the 3,804 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
51%
Carrier
26%
Late-arriving aircraft
21%
Extreme weather
2%

51% 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 1,934 minutes out of 3,804, against a national NAS share of 21%. The split is drawn from 3,804 delay minutes reported on UA 1074.

Cancellations are rare at 0.37%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

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. 10.2% 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 eight other city pairs in the data, including SFO to SAN (90), EWR to BOS (53) and SFO to PHX (37), but none flew often enough under UA 1074 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to SFO only.

One caution: this is a thin sample. 268 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 1074

For a booking, read UA 1074 as 81.5% on time with 0.37% cancelled over 268 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