Flight number record
UA 1074
United Airlines · Boston to San Francisco
- Route
- BOS → SFO
- Departs
- 11:35
- Flights
- 269
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1074, check with United Airlines.
UA 1074 lands a B+, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 269 flights, with a median arrival 7 minutes early.
Key figures
On time
77.8%
Arrivals under 15 minutes late, of 266 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
0.37%
National rate is 1.89%
1 hour+ late
10.5%
National rate is 8.3%
These figures cover 269 flights between September 2025 and August 2026. Beyond the headline rate, 10.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 1074 flies
UA 1074 flies BOS to SFO without a single fixed slot. Its most common scheduled departure was 11:35, used on 69 of 269 flights, with 13:50 (37 flights) and 11:10 (32 flights) next.
- Departs 11:3569 flights25.7%
- Departs 13:5037 flights13.8%
- Departs 11:1032 flights11.9%
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 11:35 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1074 runs level with that at 77.8%. 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 1074 next to BOS to SFO
Every carrier on BOS to SFO combined arrived on time 69.2% of the time across 4,817 flights, so UA 1074 is 9 points ahead of it. United flew 1,940 flights on the same city pair under all its flight numbers, including this one, and those ran 72.5% on time. Across its whole network United Airlines managed 78.8%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1074thin sample | 269 | 77.8% | 68 min | 0.37% | B+ |
| All United Airlines on BOS–SFO | 1,940 | 72.5% | 66 min | 1.19% | C |
| All carriers on BOS–SFO | 4,817 | 69.2% | 66 min | 1.58% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1074 quarter by quarter
UA 1074 did not run the same all year. Its best quarter was Jan–Mar 2026 at 85.1% on time and its weakest Jul–Sep 2026 at 62.0%, a swing of 23 points on roughly 67 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 20256 flights—
- Oct–Dec 202554 flights82.7%
- Jan–Mar 202668 flights85.1%
- Apr–Jun 202691 flights78.0%
- Jul–Sep 202650 flights62.0%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1074 did best on Wednesday at 85.3% on time and worst on Friday at 67.5%. Each day rests on about 38 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1074 runs when it is late
UA 1074 often beats the schedule: 88 of 266 completed flights, 33%, arrived 15 minutes or more early. The 59 late arrivals split 15 under half an hour, 16 between 30 and 60 minutes, and 28 an hour or more.
- 15+ min early88 flights33.1%
- Within 15 min119 flights44.7%
- 15–29 min late15 flights5.6%
- 30–59 min late16 flights6.0%
- 1–2 hours late21 flights7.9%
- 2+ hours late7 flights2.6%
Scale runs 0% to 100%.
Share of 266 completed flights by arrival against schedule.
A late pushback is often recovered here: of 73 departures that left 15 minutes late or more, 22 still arrived on time. 8 flights left on time and still arrived late.
The worst days
Worst days for UA 1074
The latest arrival of the period was on 29 March 2026, 3 hours 41 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 |
|---|---|---|
| 29 March 2026 | 3 hours 41 minutes | Carrier |
| 28 May 2026 | 3 hours 18 minutes | National Airspace System |
| 21 December 2025 | 3 hours 6 minutes | National Airspace System |
| 30 May 2026 | 2 hours 52 minutes | National Airspace System |
| 20 April 2026 | 2 hours 49 minutes | National Airspace System |
Delay causes
Why UA 1074 runs late
National Airspace System accounts for 66% of the 4,007 delay minutes carriers reported here, and the remaining four split what is left.
- 66%National Airspace System
- 16%Late-arriving aircraft
- 16%Carrier
- 2%Extreme weather
66% 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 2,635 minutes out of 4,007, against a national NAS share of 21%. The split is drawn from 4,007 delay minutes reported on UA 1074.
Cancellations are rare at 0.37%, below the national 1.89% 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
10.5% 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 eight other city pairs in the data, including EWR to BOS (53), SFO to SAN (48) 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. 269 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 77.8% on time with 0.37% cancelled over 269 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BOS to SFO, every carrier and departure
- SFO to BOS, the return direction
- Delta Air Lines 1655 on the same route66.1%
- JetBlue Airways 733 on the same route55.9%
- United Airlines 2400 on the same route51.1%
- United Airlines 2441 on the same route84.4%
- JetBlue Airways 333 on the same route54.3%
- Boston Logan International (BOS) 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
- How often a connection fails at the major US hubs
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.