Flight profile · Delta Air Lines
DL335
San Francisco (SFO) to Detroit (DTW) · scheduled 10:45 PM – 6:30 AM
How DL335 performs
696 operations, June 2024 – July 2026.
DL335 arrived on time 76.4% of the time, against 81.9% for all SFO → DTW flights, so this departure is 5.5 percentage points worse than the route as a whole. Against Delta Air Lines’ own flights on this route it is 6.0 points worse.
Source: US DOT Bureau of Transportation Statistics · 696 operations, June 2024 – July 2026 · If DL335 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where DL335 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL335 | 76.4% | 0.72% | -2 min | 5.4% | 696 |
| Delta Air Lines on SFO → DTW | 82.4% | 0.69% | -6 min | 5.2% | 4,190 |
| All SFO → DTW flights | 81.9% | 0.67% | -6 min | 5.3% | 5,193 |
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
Why DL335 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
Share of the delay minutes US DOT attributed to each cause for DL335 on SFO → DTW. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies DL335 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, DL335 pushed back an average of 28 minutes late; when it came in on time or early, an average of 1 minute late.
Each departure is matched to the flight the same aircraft flew into SFO just before it, using the tail number in the DOT file, 680 of 691 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| DL335 | 31% | 61% | 8% |
| Network, same turn | 23% | 40% | 9% |
The schedule leaves a long gap on the ground, which gives a late aircraft room to catch up before this flight pushes back.
The network row is every flight with a scheduled turn of 90 minutes to 3 hours. How often DL335’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often DL335 left 15 or more minutes late is higher than the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
From pushback to gate
When it leaves SFO late, does that still matter by the time it reaches DTW?
DL335 pushes back an average of 9.9 minutes late and reaches the gate at DTW an average of 4.7 minutes late. The 5.2 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 19.7 minutes on the taxiways at SFO, 2.0 minutes shorter than a typical SFO departure in the same hour.
On arrival at DTW, DL335 spends 9.4 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at DTW spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached DTW. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 25,191 departures from SFO scheduled in the clock hour DL335 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at DTW (388,616 flights), not just DL335’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
The hour it leaves SFO
Part of any flight’s record belongs to the clock rather than to the flight. DL335 has one departure time, so this is what that time is worth.
On-time arrival rate. 25,191 departures from SFO are scheduled in the 10 PM–11 PM hour over the period, against 435,779 across the whole day.
DL335 is scheduled out of SFO at 10:45 PM, in the 10 PM–11 PM bank. Departures from SFO in that hour arrive on time 79.1% of the time against 78.7% across the airport’s whole day, so the hour DL335 leaves in is an ordinary one for SFO and explains nothing about its record either way.
The two airport figures cover every departure from SFO to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes DL335 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DTW→SFO Detroit to San Francisco | January 6, 2025 – March 8, 2025 | 62 | — |
| ATL→SFO Atlanta to San Francisco | May 9, 2024 – June 6, 2024 | 16 | — |
| MSP→BOS Minneapolis to Boston | May 11, 2024 – June 1, 2024 | 5 | — |
| BOS→LAX Boston to Los Angeles | March 10, 2024 – May 6, 2024 | 46 | — |
| DTW→FLL Detroit to Fort Lauderdale | January 10, 2024 – March 9, 2024 | 54 | — |
| LAX→JFK Los Angeles to New York | January 7, 2024 | 1 | — |
| ATL→LGA Atlanta to New York | September 5, 2023 – January 6, 2024 | 99 | 93.9% |
| GEG→SEA Spokane to Seattle | November 23–24, 2023 | 2 | — |
| SEA→SMF Seattle to Sacramento | October 29, 2023 – November 4, 2023 | 2 | — |
| ATL→TYS Atlanta to Knoxville/Maryville | October 28, 2023 | 1 | — |
| SLC→ATL Salt Lake City to Atlanta | July 2, 2023 – September 4, 2023 | 64 | — |
Because the same number has served different journeys, the statistics above describe only the route DL335 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
40 min late
against a median of 2 min early
Percentiles over 696 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL772 | Delta Air Lines | 94.5% | 12 min early | 785 |
| DL361 | Delta Air Lines | 81.5% | 4 min early | 724 |
| DL335 this flight | Delta Air Lines | 76.4% | 2 min early | 696 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. DL335 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 696 records of DL335 operating SFO → DTW, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed