Flight number record
UA 2117
United Airlines · San Diego to San Francisco
- Route
- SAN → SFO
- Departs
- 16:00
- Flights
- 358
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2117, check with United Airlines.
UA 2117 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 358 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.3%, so UA 2117 runs 4 points behind the country as a whole. Across a thousand flights that is about 40 extra late arrivals.
Key figures
On time
73.3%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.89%
1 hour+ late
8.7%
National rate is 8.3%
These figures cover 358 flights between September 2025 and August 2026. Beyond the headline rate, 8.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 2117 flies
UA 2117 flies SAN to SFO without a single fixed slot. Its most common scheduled departure was 16:00, used on 101 of 358 flights, with 16:09 (81 flights) next.
- Departs 16:00101 flights28.2%
- Departs 16:0981 flights22.6%
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 16:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 2117 runs level with that at 73.3%. 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 2117 next to SAN to SFO
Every carrier on SAN to SFO combined arrived on time 59.5% of the time across 6,763 flights, so UA 2117 is 14 points ahead of it. United flew 2,666 flights on the same city pair under all its flight numbers, including this one, and those ran 67.2% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2117thin sample | 358 | 73.3% | 58 min | 0.56% | C+ |
| All United Airlines on SAN–SFO | 2,666 | 67.2% | 57 min | 0.56% | C+ |
| All carriers on SAN–SFO | 6,763 | 59.5% | 60 min | 1.29% | D |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2117 quarter by quarter
UA 2117 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jul–Sep 2026 at 58.3%, a swing of 28 points on roughly 72 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 flights86.7%
- Oct–Dec 202586 flights76.5%
- Jan–Mar 202690 flights81.1%
- Apr–Jun 202691 flights68.1%
- Jul–Sep 202661 flights58.3%
Scale runs 50% to 90%.
By weekday, UA 2117 did best on Saturday at 82.2% on time and worst on Thursday at 60.8%. Each day rests on about 51 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2117 runs when it is late
UA 2117 often beats the schedule: 98 of 356 completed flights, 28%, arrived 15 minutes or more early. The 95 late arrivals split 41 under half an hour, 23 between 30 and 60 minutes, and 31 an hour or more.
- 15+ min early98 flights27.5%
- Within 15 min163 flights45.8%
- 15–29 min late41 flights11.5%
- 30–59 min late23 flights6.5%
- 1–2 hours late20 flights5.6%
- 2+ hours late11 flights3.1%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
18 of 92 late departures made up the time and arrived on time, 20% of them. In the other direction, 21 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SFO.
The worst days
Worst days for UA 2117
The latest arrival of the period was on 1 July 2026, 4 hours 43 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 July 2026 | 4 hours 43 minutes | Late-arriving aircraft |
| 3 January 2026 | 4 hours 12 minutes | National Airspace System |
| 13 July 2026 | 4 hours 1 minute | Late-arriving aircraft |
| 24 July 2026 | 3 hours 22 minutes | Late-arriving aircraft |
| 5 May 2026 | 2 hours 54 minutes | Late-arriving aircraft |
Delay causes
Why UA 2117 runs late
Late-arriving aircraft accounts for 53% of the 5,549 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Late-arriving aircraft
- 36%National Airspace System
- 10%Carrier
- 0%Extreme weather
53% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,549 reported delay minutes here, that single category outweighs weather by 53 to one. The split is drawn from 5,549 delay minutes reported on UA 2117.
Cancellations are rare at 0.56%, 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
8.7% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The same number turns up on six other city pairs in the data, including SFO to PIT (68), SFO to EUG (52) and SFO to ORD (44), but none flew often enough under UA 2117 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SAN to SFO only.
One caution: this is a thin sample. 358 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 2117
For a booking, read UA 2117 as 73.3% on time with 0.56% cancelled over 358 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SAN to SFO, every carrier and departure
- SFO to SAN, the return direction
- United Airlines 1763 on the same route71.1%
- SkyWest Airlines 3347 on the same route56.3%
- San Diego International (SAN) 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
- 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.