Flight number record
DL 1277
Delta Air Lines · Salt Lake City to Santa Ana
- Route
- SLC → SNA
- Departs
- 15:15
- Flights
- 358
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1277, check with Delta Air Lines.
DL 1277 lands a B+, 4 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 55 minutes on average. That rests on 358 flights, with a median arrival 6 minutes early.
Key figures
On time
81.1%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
0.84%
National rate is 1.89%
1 hour+ late
5.6%
National rate is 8.3%
These figures cover 358 flights between September 2025 and August 2026. The median arrival is 6 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 1277 flies
DL 1277 flies SLC to SNA without a single fixed slot. Its most common scheduled departure was 15:15, used on 75 of 358 flights, with 15:10 (48 flights) and 15:30 (40 flights) next.
- Departs 15:1575 flights20.9%
- Departs 15:1048 flights13.4%
- Departs 15:3040 flights11.2%
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 15:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 1277 runs 9 points better at 81.1%. 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 1277 next to SLC to SNA
Every carrier on SLC to SNA combined arrived on time 83.1% of the time across 1,858 flights, so DL 1277 is 2 points behind it. Delta flew 1,606 flights on the same city pair under all its flight numbers, including this one, and those ran 83.0% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1277thin sample | 358 | 81.1% | 54 min | 0.84% | B+ |
| All Delta Air Lines on SLC–SNA | 1,606 | 83.0% | 62 min | 0.50% | B+ |
| All carriers on SLC–SNA | 1,858 | 83.1% | 63 min | 0.70% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1277 quarter by quarter
Quarter by quarter DL 1277 held fairly steady: 83.3% in Jul–Sep 2025, 78.7% in Oct–Dec 2025, 83.1% in Jan–Mar 2026, 84.3% in Apr–Jun 2026 and 75.9% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights83.3%
- Oct–Dec 202591 flights78.7%
- Jan–Mar 202690 flights83.1%
- Apr–Jun 202689 flights84.3%
- Jul–Sep 202658 flights75.9%
Scale runs 65% to 90%.
By weekday, DL 1277 did best on Tuesday at 94.1% on time and worst on Friday at 70.6%. Each day rests on about 51 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1277 runs when it is late
DL 1277 often beats the schedule: 91 of 355 completed flights, 26%, arrived 15 minutes or more early. The 67 late arrivals split 25 under half an hour, 22 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early91 flights25.6%
- Within 15 min197 flights55.5%
- 15–29 min late25 flights7.0%
- 30–59 min late22 flights6.2%
- 1–2 hours late13 flights3.7%
- 2+ hours late7 flights2.0%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
12 of 66 late departures made up the time and arrived on time, 18% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for DL 1277
The latest arrival of the period was on 18 February 2026, 4 hours 36 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 February 2026 | 4 hours 36 minutes | Carrier |
| 17 August 2026 | 3 hours 10 minutes | Carrier |
| 27 July 2026 | 2 hours 38 minutes | Carrier |
| 25 July 2026 | 2 hours 33 minutes | Carrier |
| 20 November 2025 | 2 hours 14 minutes | Late-arriving aircraft |
Delay causes
Why DL 1277 runs late
Carrier accounts for 59% of the 3,618 delay minutes carriers reported here, and the remaining four split what is left.
- 59%Carrier
- 27%Late-arriving aircraft
- 13%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 59%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,135 of the 3,618 delay minutes reported here. The split is drawn from 3,618 delay minutes reported on DL 1277.
Cancellations are rare at 0.84%, 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
5.6% 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 55 minutes, which a normal layover absorbs.
The 588 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 1277 is not only a SLC to SNA flight. It also flew SNA to SLC (334 flights, 84.0% 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. 358 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 |
|---|---|---|---|---|---|
| SNA to SLCthin sample | 334 | 84.0% | 79 min | 0.90% | B+ |
What to do with this
Booking DL 1277
For a booking, read DL 1277 as 81.1% on time with 0.84% cancelled over 358 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SLC to SNA, every carrier and departure
- SNA to SLC, the return direction
- Delta Air Lines 1304 on the same route84.5%
- Delta Air Lines 1198 on the same route88.8%
- Delta Air Lines 1189 on the same route77.5%
- Salt Lake City International (SLC) delay statistics
- John Wayne Airport (SNA) 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
- Worst months to fly in the US, ranked by the data
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.