Flight number record
DL 1210
Delta Air Lines · Salt Lake City to San Diego
- Route
- SLC → SAN
- Departs
- 15:00
- Flights
- 364
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1210, check with Delta Air Lines.
DL 1210 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 77.6%. The late ones land roughly 50 minutes behind schedule. That rests on 364 flights, with a median arrival 2 minutes early.
Key figures
On time
75.9%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.81%
1 hour+ late
7.5%
National rate is 8.1%
These figures cover 364 flights between July 2025 and June 2026. The median arrival is 2 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 DL 1210 flies
DL 1210 flies SLC to SAN without a single fixed slot. Its most common scheduled departure was 15:00, used on 220 of 364 flights, with 15:37 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 15:00220 flights60.4%
- Departs 15:3738 flights10.4%
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 15:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 1210 runs 4 points better at 75.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
DL 1210 next to SLC to SAN
Every carrier on SLC to SAN combined arrived on time 83.2% of the time across 2,958 flights, so DL 1210 is 7 points behind it. Delta flew 1,731 flights on the same city pair under all its flight numbers, including this one, and those ran 83.8% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1210thin sample | 364 | 75.9% | 51 min | 0.55% | B+ |
| All Delta Air Lines on SLC–SAN | 1,731 | 83.8% | 55 min | 0.81% | B+ |
| All carriers on SLC–SAN | 2,958 | 83.2% | 54 min | 0.85% | B+ |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 1210 quarter by quarter
DL 1210 did not run the same all year. Its best quarter was Jan–Mar 2026 at 84.3% on time and its weakest Oct–Dec 2025 at 70.0%, a swing of 14 points on roughly 91 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 202592 flights76.1%
- Oct–Dec 202591 flights70.0%
- Jan–Mar 202690 flights84.3%
- Apr–Jun 202691 flights73.3%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1210 did best on Monday at 80.8% on time and worst on Sunday at 66.0%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 1210 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,454 reported delay minutes.
- 36%Late-arriving aircraft
- 33%Carrier
- 25%National Airspace System
- 6%Extreme weather
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,454 reported delay minutes here, that single category outweighs weather by 6 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,454 delay minutes reported on DL 1210.
Cancellations are rare at 0.55%, below the national 1.81% 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
7.5% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 50 minutes, which a normal layover absorbs.
The 626 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.
DL 1210 is not only a SLC to SAN flight. It also flew SAN to SLC (351 flights, 81.9% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 364 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SAN to SLCthin sample | 351 | 81.9% | 58 min | 0.57% | B+ |
What to do with this
Booking DL 1210
For a booking, DL 1210 is one of the weaker ways to fly SLC to SAN: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- SLC to SAN, every carrier and departure
- SAN to SLC, the return direction
- Delta Air Lines 1296 on the same route83.6%
- Delta Air Lines 1177 on the same route92.2%
- Delta Air Lines 1202 on the same route84.4%
- Delta Air Lines 1252 on the same route83.0%
- Salt Lake City International (SLC) delay statistics
- San Diego International (SAN) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines 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 Delta Air Lines’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.