Flight number record
DL 1715
Delta Air Lines · San Francisco to Los Angeles
- Route
- SFO → LAX
- Departs
- 10:40
- Flights
- 299
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1715, check with Delta Air Lines.
DL 1715 earns a D, which is as low as this site's scale goes for a reason. Only 56.1% of flights arrive inside the 15-minute window, 21 points worse than the national rate of 77.3%. Late arrivals average about 55 minutes. Treat any tight connection here as a coin flip. That rests on 299 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.3%, so DL 1715 runs 21 points behind the country as a whole. Across a thousand flights that is about 212 extra late arrivals.
Key figures
On time
56.1%
Arrivals under 15 minutes late, of 294 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
1.67%
National rate is 1.89%
1 hour+ late
10.9%
National rate is 8.3%
These figures cover 299 flights between September 2025 and August 2026. Beyond the headline rate, 10.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1715 flies
DL 1715 flies SFO to LAX without a single fixed slot. Its most common scheduled departure was 10:40, used on 52 of 299 flights, with 11:00 (51 flights) and 11:45 (50 flights) next.
- Departs 10:4052 flights17.4%
- Departs 11:0051 flights17.1%
- Departs 11:4550 flights16.7%
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 10:40 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1715 runs 28 points worse at 56.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 1715 next to SFO to LAX
Every carrier on SFO to LAX combined arrived on time 70.9% of the time across 11,437 flights, so DL 1715 is 15 points behind it. Delta flew 2,373 flights on the same city pair under all its flight numbers, including this one, and those ran 69.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 25 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1715thin sample | 299 | 56.1% | 54 min | 1.67% | D |
| All Delta Air Lines on SFO–LAX | 2,373 | 69.8% | 63 min | 1.56% | C |
| All carriers on SFO–LAX | 11,437 | 70.9% | 58 min | 0.82% | C+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1715 quarter by quarter
DL 1715 did not run the same all year. Its best quarter was Jan–Mar 2026 at 86.4% on time and its weakest Jul–Sep 2026 at 44.8%, a swing of 42 points on roughly 60 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 flights60.0%
- Oct–Dec 202580 flights57.5%
- Jan–Mar 202645 flights86.4%
- Apr–Jun 202686 flights45.1%
- Jul–Sep 202658 flights44.8%
Scale runs 35% to 90%.
By weekday, DL 1715 did best on Saturday at 69.4% on time and worst on Thursday at 41.9%. Each day rests on about 43 flights, so a gap of 28 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1715 runs when it is late
The 129 late arrivals split 51 under half an hour, 46 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early42 flights14.3%
- Within 15 min123 flights41.8%
- 15–29 min late51 flights17.3%
- 30–59 min late46 flights15.6%
- 1–2 hours late22 flights7.5%
- 2+ hours late10 flights3.4%
Scale runs 0% to 100%.
Share of 294 completed flights by arrival against schedule.
20 of 136 late departures made up the time and arrived on time, 15% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for DL 1715
The latest arrival of the period was on 14 June 2026, 6 hours 6 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 |
|---|---|---|
| 14 June 2026 | 6 hours 6 minutes | Late-arriving aircraft |
| 19 September 2025 | 5 hours 47 minutes | Late-arriving aircraft |
| 17 May 2026 | 5 hours 25 minutes | Late-arriving aircraft |
| 27 March 2026 | 4 hours 38 minutes | Carrier |
| 6 May 2026 | 3 hours 31 minutes | Late-arriving aircraft |
Delay causes
Why DL 1715 runs late
Late-arriving aircraft accounts for 79% of the 7,024 delay minutes carriers reported here, and the remaining four split what is left.
- 79%Late-arriving aircraft
- 12%National Airspace System
- 9%Carrier
79% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,024 reported delay minutes here, that single category outweighs weather by 79 to one. The split is drawn from 7,024 delay minutes reported on DL 1715.
Cancellations sit at 1.67% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
10.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
DL 1715 is not only a SFO to LAX flight. It also flew LAX to SFO (297 flights, 48.3% 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. 299 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 |
|---|---|---|---|---|---|
| LAX to SFOthin sample | 297 | 48.3% | 51 min | 2.36% | F |
What to do with this
Booking DL 1715
For a booking, DL 1715 is one of the weaker ways to fly SFO to LAX: 15 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
- SFO to LAX, every carrier and departure
- LAX to SFO, the return direction
- Delta Air Lines 1598 on the same route93.4%
- Delta Air Lines 1421 on the same route89.7%
- Delta Air Lines 2267 on the same route49.2%
- United Airlines 2179 on the same route68.5%
- United Airlines 1754 on the same route71.8%
- United Airlines 1164 on the same route73.7%
- San Francisco International (SFO) delay statistics
- Los Angeles International (LAX) 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.