Flight number record
UA 2479
United Airlines · San Antonio to Denver
- Route
- SAT → DEN
- Departs
- 16:35
- Flights
- 308
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2479, check with United Airlines.
UA 2479 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 a little over an hour behind schedule. That rests on 308 flights, with a median arrival 3 minutes early.
Key figures
On time
73.4%
Arrivals under 15 minutes late, of 305 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
12.1%
National rate is 8.3%
These figures cover 308 flights between September 2025 and August 2026. Beyond the headline rate, 12.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 2479 flies
UA 2479 flies SAT to DEN without a single fixed slot. Its most common scheduled departure was 16:35, used on 99 of 308 flights, with 16:45 (53 flights) and 16:43 (37 flights) next.
- Departs 16:3599 flights32.1%
- Departs 16:4553 flights17.2%
- Departs 16:4337 flights12.0%
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 16:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 2479 runs level with that at 73.4%. 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 2479 next to SAT to DEN
Every carrier on SAT to DEN combined arrived on time 82.1% of the time across 3,063 flights, so UA 2479 is 9 points behind it. United flew 1,197 flights on the same city pair under all its flight numbers, including this one, and those ran 83.4% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2479thin sample | 308 | 73.4% | 70 min | 0.00% | C+ |
| All United Airlines on SAT–DEN | 1,197 | 83.4% | 79 min | 0.67% | B+ |
| All carriers on SAT–DEN | 3,063 | 82.1% | 69 min | 0.52% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2479 quarter by quarter
UA 2479 did not run the same all year. Its best quarter was Jan–Mar 2026 at 82.2% on time and its weakest Jul–Sep 2026 at 61.0%, a swing of 21 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.
- Oct–Dec 202566 flights80.3%
- Jan–Mar 202690 flights82.2%
- Apr–Jun 202691 flights67.8%
- Jul–Sep 202661 flights61.0%
Scale runs 55% to 90%.
By weekday, UA 2479 did best on Tuesday at 84.1% on time and worst on Saturday at 62.8%. Each day rests on about 44 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2479 runs when it is late
The 81 late arrivals split 25 under half an hour, 19 between 30 and 60 minutes, and 37 an hour or more.
- 15+ min early56 flights18.4%
- Within 15 min168 flights55.1%
- 15–29 min late25 flights8.2%
- 30–59 min late19 flights6.2%
- 1–2 hours late22 flights7.2%
- 2+ hours late15 flights4.9%
Scale runs 0% to 100%.
Share of 305 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 67 departures that left 15 minutes late or more, only 6 made it up before arrival. In the other direction, 20 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 DEN.
The worst days
Worst days for UA 2479
The latest arrival of the period was on 14 August 2026, 3 hours 45 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 August 2026 | 3 hours 45 minutes | National Airspace System |
| 8 June 2026 | 3 hours 28 minutes | National Airspace System |
| 13 July 2026 | 3 hours 22 minutes | Late-arriving aircraft |
| 10 August 2026 | 3 hours 16 minutes | National Airspace System |
| 29 July 2026 | 3 hours 8 minutes | National Airspace System |
Delay causes
Why UA 2479 runs late
National Airspace System accounts for 56% of the 5,632 delay minutes carriers reported here, and the remaining four split what is left.
- 56%National Airspace System
- 30%Late-arriving aircraft
- 14%Carrier
- 0%Extreme weather
56% 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 3,129 minutes out of 5,632, against a national NAS share of 21%. The split is drawn from 5,632 delay minutes reported on UA 2479.
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
12.1% 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 794 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 DEN to SBA (155), EWR to ORD (31) and ORD to SAT (26), but none flew often enough under UA 2479 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SAT to DEN only.
One caution: this is a thin sample. 308 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 2479
For a booking, UA 2479 is a flight to put a long connection behind. 12.1% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- SAT to DEN, every carrier and departure
- DEN to SAT, the return direction
- United Airlines 2853 on the same route85.3%
- San Antonio International (SAT) delay statistics
- Denver International (DEN) 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.