Flight number record
DL 920
Delta Air Lines · San Francisco to Salt Lake City
- Route
- SFO → SLC
- Departs
- 09:55
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 920, check with Delta Air Lines.
DL 920 lands a B, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 361 flights, with a median arrival 7 minutes early.
Key figures
On time
76.1%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
1.66%
National rate is 1.89%
1 hour+ late
8.2%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. Beyond the headline rate, 8.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 920 flies
DL 920 flies SFO to SLC without a single fixed slot. Its most common scheduled departure was 09:55, used on 102 of 361 flights, with 09:50 (57 flights) and 09:46 (40 flights) next.
- Departs 09:55102 flights28.3%
- Departs 09:5057 flights15.8%
- Departs 09:4640 flights11.1%
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 09:55 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 920 runs 8 points worse at 76.1%. 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 920 next to SFO to SLC
Every carrier on SFO to SLC combined arrived on time 75.0% of the time across 3,431 flights, so DL 920 is about level with it. Delta flew 1,714 flights on the same city pair under all its flight numbers, including this one, and those ran 75.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 920thin sample | 361 | 76.1% | 63 min | 1.66% | B |
| All Delta Air Lines on SFO–SLC | 1,714 | 75.7% | 74 min | 0.93% | B+ |
| All carriers on SFO–SLC | 3,431 | 75.0% | 70 min | 1.02% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 920 quarter by quarter
DL 920 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jul–Sep 2026 at 62.3%, a swing of 34 points on roughly 72 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 flights96.7%
- Oct–Dec 202588 flights85.2%
- Jan–Mar 202690 flights82.8%
- Apr–Jun 202691 flights62.9%
- Jul–Sep 202662 flights62.3%
Scale runs 55% to 100%.
By weekday, DL 920 did best on Tuesday at 82.7% on time and worst on Friday at 70.6%. Each day rests on about 52 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 920 runs when it is late
DL 920 often beats the schedule: 116 of 355 completed flights, 33%, arrived 15 minutes or more early. The 85 late arrivals split 30 under half an hour, 26 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early116 flights32.7%
- Within 15 min154 flights43.4%
- 15–29 min late30 flights8.5%
- 30–59 min late26 flights7.3%
- 1–2 hours late20 flights5.6%
- 2+ hours late9 flights2.5%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
28 of 113 late departures made up the time and arrived on time, 25% of them. No flight that left on time arrived late.
The worst days
Worst days for DL 920
The latest arrival of the period was on 20 March 2026, 7 hours 46 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across March, December, July, June and April, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 March 2026 | 7 hours 46 minutes | Carrier |
| 20 December 2025 | 5 hours 36 minutes | Carrier |
| 2 July 2026 | 4 hours 21 minutes | Security |
| 6 June 2026 | 2 hours 56 minutes | Late-arriving aircraft |
| 2 April 2026 | 2 hours 48 minutes | Late-arriving aircraft |
Delay causes
Why DL 920 runs late
Late-arriving aircraft accounts for 67% of the 5,374 delay minutes carriers reported here, and the remaining four split what is left.
- 67%Late-arriving aircraft
- 21%Carrier
- 7%National Airspace System
- 4%Security
- 0%Extreme weather
67% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,374 reported delay minutes here, that single category outweighs weather by 67 to one. The split is drawn from 5,374 delay minutes reported on DL 920.
Cancellations sit at 1.66% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
8.2% 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 about an hour, which a normal layover absorbs.
The 599 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.
DL 920 is not only a SFO to SLC flight. It also flew SLC to SFO (361 flights, 63.9% 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. 361 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 |
|---|---|---|---|---|---|
| SLC to SFOthin sample | 361 | 63.9% | 45 min | 1.66% | D |
What to do with this
Booking DL 920
For a booking, read DL 920 as 76.1% on time with 1.66% cancelled over 361 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SFO to SLC, every carrier and departure
- SLC to SFO, the return direction
- Delta Air Lines 1331 on the same route96.1%
- Delta Air Lines 1088 on the same route65.4%
- Delta Air Lines 902 on the same route65.4%
- San Francisco International (SFO) 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
- 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.