Flight number record

DL 1715

Delta Air Lines · San Francisco to Los Angeles

Route: SFO → LAX
Departs: 10:55
Flights: 303
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1715, check with Delta Air Lines.

DL 1715 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 303 flights, with a median arrival 7 minutes late.

The national on-time rate over the same period is 77.6%, so DL 1715 runs 17 points behind the country as a whole. Across a thousand flights that is about 175 extra late arrivals.

On time

60.1%

Arrivals under 15 minutes late, of 298 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

1.65%

National rate is 1.81%

1 hour+ late

11.1%

National rate is 8.1%

These figures cover 303 flights between July 2025 and June 2026. Beyond the headline rate, 11.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 1715 flies

DL 1715 flies SFO to LAX without a single fixed slot. Its most common scheduled departure was 10:55, used on 97 of 303 flights, with 10:40 (52 flights) and 11:00 (51 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:5597 flights32.0%
Departs 10:4052 flights17.2%
Departs 11:0051 flights16.8%

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 10:55 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1715 runs 24 points worse at 60.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 1715 next to SFO to LAX

Every carrier on SFO to LAX combined arrived on time 73.9% of the time across 11,015 flights, so DL 1715 is 14 points behind it. Delta flew 2,373 flights on the same city pair under all its flight numbers, including this one, and those ran 73.6% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 21 points.

DL 1715 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1715thin sample	303	60.1%	57 min	1.65%	D
All Delta Air Lines on SFO–LAX	2,373	73.6%	65 min	1.56%	C
All carriers on SFO–LAX	11,015	73.9%	60 min	0.84%	C+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 Apr–Jun 2026 at 45.1%, a swing of 41 points on roughly 76 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 flights63.0%
Oct–Dec 202580 flights57.5%
Jan–Mar 202645 flights86.4%
Apr–Jun 202686 flights45.1%

Scale runs 35% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1715 did best on Saturday at 81.1% on time and worst on Friday at 52.3%. Each day rests on about 43 flights, so a gap of 29 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1715 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 82% of the 6,757 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
82%
National Airspace System
10%
Carrier
8%

82% 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 6,757 reported delay minutes here, that single category outweighs weather by 82 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 6,757 delay minutes reported on DL 1715.

Cancellations sit at 1.65% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.1% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 (299 flights, 51.7% 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. 303 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.

Other routes flown as DL 1715
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
LAX to SFOthin sample	299	51.7%	54 min	2.34%	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: 14 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.

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures