Carrier route record
DLSLC→SJC
Delta Air Lines · Salt Lake City to San Jose
- Flights
- 924
- Period
- September 2025 to August 2026
- Share of route
- 51%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on SLC to SJC earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 924 flights, with a median arrival 9 minutes early.
Set against the rest of the country, Delta's SLC to SJC record is 8 points better than the US average of 77.3%. That gap is worth roughly 84 fewer late arrivals for every thousand flights.
Key figures
On time
85.7%
Arrivals under 15 minutes late, of 920 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.43%
National rate is 1.89%
Whole route
86.7%
Every carrier on SLC to SJC, 1,796 flights
These figures cover 924 flights between September 2025 and August 2026. The median arrival is 9 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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Carrier by carrier
Delta against every carrier on SLC to SJC
Delta flew 924 of the 1,796 flights on SLC to SJC, most of the route. Its 85.7% on time is about level with the route as a whole at 86.7%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from SkyWest at 92.0% to Southwest at 74.3%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 664 | 92.0% | 75 min | 0.15% | A+ |
| Delta Air Lines (this page) | 924 | 85.7% | 70 min | 0.43% | A+ |
| Southwest Airlinesthin sample | 208 | 74.3% | 44 min | 0.96% | C+ |
Flight by flight
Delta flight numbers on SLC to SJC
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Delta runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 924 flights.
- 5am–8am10 flights—
- 8am–11am24 flights—
- 11am–2pm365 flights87.1%
- 2pm–5pm160 flights86.2%
- 5pm–8pm14 flights—
- 8pm–5am351 flights83.3%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
The 11am–2pm window is the strongest at 87.1% on time. The full set of windows spans 4 points.
Across the year
Delta on SLC to SJC through the year
April is the best month on the calendar at 92.5% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. January was the busiest month here, with 97 flights.
Across the week, Tuesday is the strongest day at 90.8% on time and Saturday the weakest at 79.7%, a spread of 11 points.
Arrival by arrival
How late Delta on SLC to SJC runs when it is late
Delta on SLC to SJC often beats the schedule: 281 of 920 completed flights, 31%, arrived 15 minutes or more early. The 132 late arrivals split 53 under half an hour, 39 between 30 and 60 minutes, and 40 an hour or more.
- 15+ min early281 flights30.5%
- Within 15 min507 flights55.1%
- 15–29 min late53 flights5.8%
- 30–59 min late39 flights4.2%
- 1–2 hours late27 flights2.9%
- 2+ hours late13 flights1.4%
Scale runs 0% to 100%.
Share of 920 completed flights by arrival against schedule.
27 of 143 late departures made up the time and arrived on time, 19% of them. Only 16 left on time and still arrived late.
The worst days
Worst days for Delta on SLC to SJC
The latest arrival of the period was on 16 November 2025, 12 hours 57 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 |
|---|---|---|
| 16 November 2025 | 12 hours 57 minutes | Carrier |
| 18 January 2026 | 10 hours 31 minutes | Carrier |
| 11 June 2026 | 9 hours | Carrier |
| 18 September 2025 | 8 hours 3 minutes | Carrier |
| 3 December 2025 | 8 hours | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 67% of the 9,280 delay minutes carriers reported here, and the remaining four split what is left.
- 67%Carrier
- 24%Late-arriving aircraft
- 7%National Airspace System
- 2%Extreme weather
- 0%Security
The largest share of delay minutes, 67%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,195 of the 9,280 delay minutes reported here. The split is drawn from 9,280 reported delay minutes.
Cancellations are rare at 0.43%, 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 stage length
What a delay here costs
Badly late arrivals are rare here: only 4.3% 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 584 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.
The return leg is a different operation and performs like one: it runs 93.2% on time across 924 flights, 8 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 8 points of difference.
One caution: this is a thin sample. 924 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 Delta on SLC to SJC
Put together: treat all of this as provisional. 924 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 85.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 920 completed flights over 12 months sit behind that.
Related
Where to go next
- SLC to SJC, every carrier
- Delta on SJC to SLC, the return leg
- SkyWest Airlines on SLC to SJC92.0%
- Southwest Airlines on SLC to SJC74.3%
- Delta Air Lines network-wide record
- Salt Lake City International (SLC) delay statistics
- Norman Y. Mineta San Jose International (SJC) delay statistics
- Worst months to fly in the US, ranked by the data
- The best day of the week to fly, and why it is the second lever
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.