Flight number record

DL 1252

Delta Air Lines · Salt Lake City to San Diego

Route: SLC → SAN
Departs: 17:10
Flights: 262
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1252, check with Delta Air Lines.

DL 1252 lands a B+, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 262 flights, with a median arrival 3 minutes early.

On time

79.9%

Arrivals under 15 minutes late, of 259 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

0.38%

National rate is 1.89%

1 hour+ late

5.4%

National rate is 8.3%

These figures cover 262 flights between September 2025 and August 2026. The median arrival is 3 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.

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Schedule

When DL 1252 flies

DL 1252 flies SLC to SAN without a single fixed slot. Its most common scheduled departure was 17:10, used on 122 of 262 flights, with 17:50 (49 flights) and 17:40 (31 flights) next.

Departs 17:10122 flights46.6%
Departs 17:5049 flights18.7%
Departs 17:4031 flights11.8%

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 17:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1252 runs 12 points better at 79.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

DL 1252 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 1252 is about level with 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%, close to this flight's figure.

DL 1252 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1252thin sample	262	79.9%	59 min	0.38%	B+
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 1252 quarter by quarter

DL 1252 did not run the same all year. Its best quarter was Jan–Mar 2026 at 93.2% on time and its weakest Jul–Sep 2026 at 61.2%, a swing of 32 points on roughly 66 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 202517 flights—
Oct–Dec 202577 flights81.6%
Jan–Mar 202644 flights93.2%
Apr–Jun 202674 flights81.1%
Jul–Sep 202650 flights61.2%

Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1252 did best on Tuesday at 88.6% on time and worst on Friday at 65.9%. Each day rests on about 37 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 1252 runs when it is late

The 52 late arrivals split 16 under half an hour, 22 between 30 and 60 minutes, and 14 an hour or more.

15+ min early47 flights18.1%
Within 15 min160 flights61.8%
15–29 min late16 flights6.2%
30–59 min late22 flights8.5%
1–2 hours late8 flights3.1%
2+ hours late6 flights2.3%

Scale runs 0% to 100%.

Share of 259 completed flights by arrival against schedule.

12 of 55 late departures made up the time and arrived on time, 22% of them. 9 flights left on time and still arrived late.

The worst days

Worst days for DL 1252

The latest arrival of the period was on 14 July 2026, 3 hours 49 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.

The latest arrivals of DL 1252 in the period
Date	Arrived late by	Largest filed cause
14 July 2026	3 hours 49 minutes	Carrier
8 May 2026	3 hours 30 minutes	Carrier
11 August 2026	3 hours 22 minutes	Carrier
21 June 2026	3 hours 20 minutes	Carrier
4 June 2026	3 hours 11 minutes	Carrier

Delay causes

Why DL 1252 runs late

Carrier accounts for 66% of the 3,086 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
66%
National Airspace System
19%
Late-arriving aircraft
14%
Extreme weather
2%

The largest share of delay minutes, 66%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,027 of the 3,086 delay minutes reported here. The split is drawn from 3,086 delay minutes reported on DL 1252.

Cancellations are rare at 0.38%, 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

5.4% 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 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.

The same number turns up on two other city pairs in the data, including SAN to SLC (98) and MSP to ATL (3), but none flew often enough under DL 1252 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SLC to SAN only.

One caution: this is a thin sample. 262 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 DL 1252

For a booking, read DL 1252 as 79.9% on time with 0.38% cancelled over 262 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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 22 October 2026; recomputed monthly. How this data is collected.

Key figures