Flight number record
UA 2279
United Airlines · San Francisco to Seattle
- Route
- SFO → SEA
- Departs
- 16:10
- Flights
- 296
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2279, check with United Airlines.
UA 2279 sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 296 flights, with a median arrival 8 minutes early.
Key figures
On time
75.7%
Arrivals under 15 minutes late, of 296 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
9.1%
National rate is 8.3%
These figures cover 296 flights between September 2025 and August 2026. Beyond the headline rate, 9.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 2279 flies
UA 2279 flies SFO to SEA without a single fixed slot. Its most common scheduled departure was 16:10, used on 117 of 296 flights, with 16:27 (69 flights) and 16:12 (34 flights) next.
- Departs 16:10117 flights39.5%
- Departs 16:2769 flights23.3%
- Departs 16:1234 flights11.5%
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 2279 runs 4 points better at 75.7%. 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 2279 next to SFO to SEA
Every carrier on SFO to SEA combined arrived on time 72.3% of the time across 6,821 flights, so UA 2279 is 3 points ahead of it. United flew 2,063 flights on the same city pair under all its flight numbers, including this one, and those ran 75.1% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2279thin sample | 296 | 75.7% | 66 min | 0.00% | B+ |
| All United Airlines on SFO–SEA | 2,063 | 75.1% | 57 min | 0.44% | B+ |
| All carriers on SFO–SEA | 6,821 | 72.3% | 56 min | 1.08% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2279 quarter by quarter
UA 2279 did not run the same all year. Its best quarter was Jan–Mar 2026 at 83.1% on time and its weakest Jul–Sep 2026 at 67.2%, a swing of 16 points on roughly 74 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.
- Oct–Dec 202561 flights82.0%
- Jan–Mar 202683 flights83.1%
- Apr–Jun 202691 flights70.3%
- Jul–Sep 202661 flights67.2%
Scale runs 60% to 90%.
By weekday, UA 2279 did best on Saturday at 86.8% on time and worst on Friday at 68.2%. Each day rests on about 42 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2279 runs when it is late
UA 2279 often beats the schedule: 100 of 296 completed flights, 34%, arrived 15 minutes or more early. The 72 late arrivals split 22 under half an hour, 23 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early100 flights33.8%
- Within 15 min124 flights41.9%
- 15–29 min late22 flights7.4%
- 30–59 min late23 flights7.8%
- 1–2 hours late15 flights5.1%
- 2+ hours late12 flights4.1%
Scale runs 0% to 100%.
Share of 296 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 72 departures that left 15 minutes late or more, only 6 made it up before arrival. 6 flights left on time and still arrived late.
The worst days
Worst days for UA 2279
The latest arrival of the period was on 5 November 2025, 4 hours 34 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 November 2025 | 4 hours 34 minutes | Late-arriving aircraft |
| 15 February 2026 | 3 hours 53 minutes | Late-arriving aircraft |
| 19 December 2025 | 3 hours 47 minutes | Late-arriving aircraft |
| 3 January 2026 | 3 hours 21 minutes | Late-arriving aircraft |
| 28 May 2026 | 3 hours 19 minutes | Late-arriving aircraft |
Delay causes
Why UA 2279 runs late
Late-arriving aircraft accounts for 71% of the 4,750 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Late-arriving aircraft
- 17%Carrier
- 8%National Airspace System
- 3%Extreme weather
71% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,750 reported delay minutes here, that single category outweighs weather by 22 to one. The split is drawn from 4,750 delay minutes reported on UA 2279.
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
9.1% 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.
The 679 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on six other city pairs in the data, including BOS to SFO (144), RNO to SFO (95) and PDX to SFO (45), but none flew often enough under UA 2279 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to SEA only.
One caution: this is a thin sample. 296 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 2279
For a booking, read UA 2279 as 75.7% on time with 0.00% cancelled over 296 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SFO to SEA, every carrier and departure
- SEA to SFO, the return direction
- Delta Air Lines 2721 on the same route95.3%
- Delta Air Lines 1412 on the same route74.1%
- SkyWest Airlines 3707 on the same route65.1%
- Alaska Airlines 758 on the same route67.2%
- SkyWest Airlines 3991 on the same route64.3%
- Alaska Airlines 1327 on the same route67.9%
- San Francisco International (SFO) delay statistics
- Seattle-Tacoma International (SEA) 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
- Why the first flight of the morning is statistically safest
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.