Flight number record

DL 335

Delta Air Lines · San Francisco to Detroit

Route: SFO → DTW
Departs: 22:55
Flights: 364
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 335, check with Delta Air Lines.

DL 335 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land roughly 55 minutes behind schedule. That rests on 364 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.3%, so DL 335 runs 6 points behind the country as a whole. Across a thousand flights that is about 58 extra late arrivals.

On time

71.5%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

53 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 335 flies

DL 335 flies SFO to DTW without a single fixed slot. Its most common scheduled departure was 22:55, used on 81 of 364 flights, with 22:45 (78 flights) and 22:57 (44 flights) next.

Departs 22:5581 flights22.3%
Departs 22:4578 flights21.4%
Departs 22:5744 flights12.1%

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 22:55 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 335 runs level with that at 71.5%. 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 335 next to SFO to DTW

Every carrier on SFO to DTW combined arrived on time 77.7% of the time across 1,791 flights, so DL 335 is 6 points behind it. Delta flew 1,385 flights on the same city pair under all its flight numbers, including this one, and those ran 75.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 10 points.

DL 335 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 335thin sample	364	71.5%	53 min	0.55%	C+
All Delta Air Lines on SFO–DTW	1,385	75.4%	53 min	0.79%	B+
All carriers on SFO–DTW	1,791	77.7%	53 min	0.61%	B+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 335 quarter by quarter

DL 335 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Apr–Jun 2026 at 60.4%, a swing of 23 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 flights80.9%
Jan–Mar 202690 flights76.7%
Apr–Jun 202691 flights60.4%
Jul–Sep 202662 flights61.3%

Scale runs 50% to 90%.

By weekday, DL 335 did best on Saturday at 86.5% on time and worst on Friday at 62.0%. Each day rests on about 52 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 335 runs when it is late

The 103 late arrivals split 37 under half an hour, 37 between 30 and 60 minutes, and 29 an hour or more.

15+ min early75 flights20.7%
Within 15 min184 flights50.8%
15–29 min late37 flights10.2%
30–59 min late37 flights10.2%
1–2 hours late24 flights6.6%
2+ hours late5 flights1.4%

Scale runs 0% to 100%.

Share of 362 completed flights by arrival against schedule.

23 of 114 late departures made up the time and arrived on time, 20% of them. 12 flights left on time and still arrived late.

The worst days

Worst days for DL 335

The latest arrival of the period was on 11 August 2026, 9 hours 53 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of DL 335 in the period
Date	Arrived late by	Largest filed cause
11 August 2026	9 hours 53 minutes	Carrier
6 August 2026	2 hours 32 minutes	Late-arriving aircraft
29 December 2025	2 hours 28 minutes	Carrier
27 January 2026	2 hours 28 minutes	Late-arriving aircraft
5 January 2026	2 hours 2 minutes	Late-arriving aircraft

Delay causes

Why DL 335 runs late

Late-arriving aircraft accounts for 51% of the 5,426 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
51%
Carrier
37%
National Airspace System
12%

51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,426 reported delay minutes here, that single category outweighs weather by 51 to one. The split is drawn from 5,426 delay minutes reported on DL 335.

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 55 minutes, which a normal layover absorbs.

At 2,079 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

Every one of the 364 flights under DL 335 in the data flew SFO to DTW. The number was not reused on any other city pair, which makes this a clean record of one route.

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.

What to do with this

Booking DL 335

For a booking, DL 335 is one of the weaker ways to fly SFO to DTW: 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.

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