Flight number record
DL 935
Delta Air Lines · Detroit to Salt Lake City
- Route
- DTW → SLC
- Departs
- 12:15
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 935, check with Delta Air Lines.
DL 935 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 40 minutes. That rests on 365 flights, with a median arrival 6 minutes early.
Set against the rest of the country, DL 935's record is 10 points better than the US average of 77.3%. That gap is worth roughly 101 fewer late arrivals for every thousand flights.
Key figures
On time
87.4%
Arrivals under 15 minutes late, of 365 completed flights
Avg delay
40 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
2.2%
National rate is 8.3%
These figures cover 365 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 935 flies
DL 935 flies DTW to SLC without a single fixed slot. Its most common scheduled departure was 12:15, used on 183 of 365 flights, with 12:20 (61 flights) and 12:30 (52 flights) next.
- Departs 12:15183 flights50.1%
- Departs 12:2061 flights16.7%
- Departs 12:3052 flights14.2%
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 12:15 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 935 runs 9 points better at 87.4%. 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 935 next to DTW to SLC
Every carrier on DTW to SLC combined arrived on time 79.6% of the time across 1,535 flights, so DL 935 is 8 points ahead of it. Delta flew 1,533 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 935 | 365 | 87.4% | 40 min | 0.00% | A+ |
| All Delta Air Lines on DTW–SLC | 1,533 | 79.6% | 60 min | 0.13% | B+ |
| All carriers on DTW–SLC | 1,535 | 79.6% | 60 min | 0.13% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 935 quarter by quarter
DL 935 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Oct–Dec 2025 at 80.4%, a swing of 13 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 flights93.3%
- Oct–Dec 202592 flights80.4%
- Jan–Mar 202690 flights87.8%
- Apr–Jun 202691 flights89.0%
- Jul–Sep 202662 flights91.9%
Scale runs 70% to 100%.
By weekday, DL 935 did best on Friday at 94.2% on time and worst on Wednesday at 78.8%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 935 runs when it is late
Most of the lateness is short. 28 of the 46 late arrivals were under half an hour behind, and 8 reached an hour or more.
- 15+ min early73 flights20.0%
- Within 15 min246 flights67.4%
- 15–29 min late28 flights7.7%
- 30–59 min late10 flights2.7%
- 1–2 hours late6 flights1.6%
- 2+ hours late2 flights0.5%
Scale runs 0% to 100%.
Share of 365 completed flights by arrival against schedule.
6 of 32 late departures made up the time and arrived on time, 19% of them. In the other direction, 20 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SLC.
The worst days
Worst days for DL 935
The latest arrival of the period was on 27 June 2026, 3 hours 7 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 June 2026 | 3 hours 7 minutes | Carrier |
| 25 January 2026 | 2 hours 38 minutes | Carrier |
| 8 December 2025 | 1 hour 40 minutes | Carrier |
| 19 July 2026 | 1 hour 29 minutes | Carrier |
| 26 January 2026 | 1 hour 22 minutes | Carrier |
Delay causes
Why DL 935 runs late
Carrier accounts for 59% of the 1,829 delay minutes carriers reported here, and the remaining four split what is left.
- 59%Carrier
- 28%National Airspace System
- 8%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 59%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,074 of the 1,829 delay minutes reported here. The split is drawn from 1,829 delay minutes reported on DL 935.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.2% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,481 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.
Every one of the 365 flights under DL 935 in the data flew DTW to SLC. 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. 365 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 935
For a booking, DL 935 has one of the better records a US domestic flight can show: 87.4% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DTW to SLC, every carrier and departure
- SLC to DTW, the return direction
- Delta Air Lines 698 on the same route87.9%
- Delta Air Lines 2117 on the same route64.6%
- Delta Air Lines 765 on the same route76.7%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Salt Lake City International (SLC) 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.