Flight number record
UA 1940
United Airlines · Denver to San Diego
- Route
- DEN → SAN
- Departs
- 11:33
- Flights
- 316
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1940, check with United Airlines.
UA 1940 lands a B+, 4 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 316 flights, with a median arrival 7 minutes early.
Set against the rest of the country, UA 1940's record is 4 points better than the US average of 77.6%. That gap is worth roughly 44 fewer late arrivals for every thousand flights.
Key figures
On time
82.0%
Arrivals under 15 minutes late, of 316 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
4.1%
National rate is 8.1%
These figures cover 316 flights between July 2025 and June 2026. The median arrival is 7 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Schedule
When UA 1940 flies
UA 1940 flies DEN to SAN without a single fixed slot. Its most common scheduled departure was 11:33, used on 68 of 316 flights, with 11:15 (62 flights) and 11:24 (56 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 11:3368 flights21.5%
- Departs 11:1562 flights19.6%
- Departs 11:2456 flights17.7%
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 11:33 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1940 runs 3 points better at 82.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 1940 next to DEN to SAN
Every carrier on DEN to SAN combined arrived on time 75.6% of the time across 5,949 flights, so UA 1940 is 6 points ahead of it. United flew 2,081 flights on the same city pair under all its flight numbers, including this one, and those ran 79.8% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1940thin sample | 316 | 82.0% | 53 min | 0.00% | B+ |
| All United Airlines on DEN–SAN | 2,081 | 79.8% | 59 min | 0.48% | B+ |
| All carriers on DEN–SAN | 5,949 | 75.6% | 56 min | 0.66% | B+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 1940 quarter by quarter
UA 1940 did not run the same all year. Its best quarter was Jan–Mar 2026 at 87.8% on time and its weakest Apr–Jun 2026 at 76.9%, a swing of 11 points on roughly 79 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 202543 flights83.7%
- Oct–Dec 202592 flights80.4%
- Jan–Mar 202690 flights87.8%
- Apr–Jun 202691 flights76.9%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1940 did best on Monday at 93.3% on time and worst on Thursday at 68.9%. Each day rests on about 45 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1940 runs late
One category carries most of the weight here. National Airspace System accounts for 49% of the 2,996 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.
- 49%National Airspace System
- 29%Late-arriving aircraft
- 22%Carrier
49% 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 1,469 minutes out of 2,996, against a national NAS share of 21%. The split is drawn from 2,996 delay minutes reported on UA 1940.
Cancellations are rare at 0.00%, below the national 1.81% 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
Badly late arrivals are rare here: only 4.1% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 853 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on seven other city pairs in the data, including IAD to SFO (49), XNA to DEN (35) and FLL to DEN (24), but none flew often enough under UA 1940 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to SAN only.
One caution: this is a thin sample. 316 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 1940
For a booking, read UA 1940 as 82.0% on time with 0.00% cancelled over 316 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to SAN, every carrier and departure
- SAN to DEN, the return direction
- United Airlines 540 on the same route65.7%
- United Airlines 1302 on the same route88.0%
- United Airlines 2309 on the same route90.3%
- United Airlines 1281 on the same route84.6%
- United Airlines 1835 on the same route65.7%
- Denver International (DEN) delay statistics
- San Diego International (SAN) 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
- Worst months to fly in the US, ranked by the data
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.