Flight number record
DL 1210
Delta Air Lines · Salt Lake City to San Diego
- Route
- SLC → SAN
- Departs
- 15:00
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 C+. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. 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
74.8%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
52 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
8.0%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 226 of 364 flights, with 15:37 (38 flights) next.
- Departs 15:00226 flights62.1%
- Departs 15:3738 flights10.4%
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 15:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 1210 runs 3 points better at 74.8%. 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
DL 1210 next to SLC to SAN
Every carrier on SLC to SAN combined arrived on time 80.9% of the time across 3,097 flights, so DL 1210 is 6 points behind it. Delta flew 1,738 flights on the same city pair under all its flight numbers, including this one, and those ran 82.2% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1210thin sample | 364 | 74.8% | 52 min | 0.55% | C+ |
| All Delta Air Lines on SLC–SAN | 1,738 | 82.2% | 54 min | 0.92% | B+ |
| All carriers on SLC–SAN | 3,097 | 80.9% | 54 min | 0.90% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 Jul–Sep 2026 at 66.1%, a swing of 18 points on roughly 73 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 flights83.3%
- Oct–Dec 202591 flights70.0%
- Jan–Mar 202690 flights84.3%
- Apr–Jun 202691 flights73.3%
- Jul–Sep 202662 flights66.1%
Scale runs 60% to 90%.
By weekday, DL 1210 did best on Tuesday at 82.7% on time and worst on Sunday at 64.0%. Each day rests on about 52 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1210 runs when it is late
The 91 late arrivals split 30 under half an hour, 32 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early47 flights13.0%
- Within 15 min223 flights61.8%
- 15–29 min late30 flights8.3%
- 30–59 min late32 flights8.9%
- 1–2 hours late23 flights6.4%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
16 of 90 late departures made up the time and arrived on time, 18% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for DL 1210
The latest arrival of the period was on 27 December 2025, 3 hours 2 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 December 2025 | 3 hours 2 minutes | Late-arriving aircraft |
| 16 July 2026 | 2 hours 39 minutes | Late-arriving aircraft |
| 3 August 2026 | 2 hours 31 minutes | Late-arriving aircraft |
| 25 January 2026 | 2 hours 24 minutes | Late-arriving aircraft |
| 24 April 2026 | 2 hours 21 minutes | National Airspace System |
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 4,721 reported delay minutes.
- 34%Late-arriving aircraft
- 32%National Airspace System
- 27%Carrier
- 7%Extreme weather
34% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,721 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 4,721 delay minutes reported on DL 1210.
Cancellations are rare at 0.55%, 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
8.0% 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 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.
DL 1210 is not only a SLC to SAN flight. It also flew SAN to SLC (359 flights, 80.4% 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 | 359 | 80.4% | 55 min | 0.56% | 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: 6 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 route81.0%
- Delta Air Lines 1202 on the same route81.9%
- Delta Air Lines 1177 on the same route92.8%
- SkyWest Airlines 3018 on the same route92.0%
- Delta Air Lines 1252 on the same route79.9%
- SkyWest Airlines 3019 on the same route75.2%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.