Route profile
SJC→SLC
Flight reliability, delays and best times to fly from San Jose to Salt Lake City, 584 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 97% of comparable major US routes (4,598 compared)
Calculated from 5,660 flights. How this is calculated · What counts as on time
SJC → SLC arrives on time 91.5% of the time; the return trip, SLC → SJC, arrives on time 87.2% of the time, a 4.2-point gap between the two directions of the same city pair.
SJC → SLC spends 21.0 minutes on the ground on a 584-mile trip: 14.5 minutes from pushback to wheels-up at SJC and 6.6 minutes from touchdown to gate at SLC.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
This route holds up about the same all year, a steadier seasonal pattern than 100% of 3,357 comparable routes.
94.1% on time in its best month (November) against 88.3% in its worst (June).
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 3,357 in the comparison.
What sets this route apart
Where SJC to SLC differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
SJC to SLC is at its best against routes of similar length for flights scheduled at 7 PM: 90.9% arrive on time, 22.7 points ahead of the 68.2% those routes manage at that hour. Against all other routes the gap is 23.1 points.
SJC to SLC holds up on Sundays better than routes of similar length do: 89.6% on time to their 75.2%, a 14.4 points lead. Against all other routes the gap is 14.8 points.
July is kinder to SJC to SLC than to routes of similar length: 89.9% on time against 69.7%, 20.2 points better. Against all other routes the gap is 20.2 points.
Delta Air Lines does better on SJC to SLC than on its routes of similar length: 91.5% on time here, 81.8% there, 9.7 points apart. Against all other routes the gap is 10 points.
SJC to SLC against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 7 PM departures | 90.9% | routes of similar length | 68.2% | +22.7 pts | 452 here, 111,670 there |
| Weekday: Sunday | 89.6% | routes of similar length | 75.2% | +14.4 pts | 849 here, 283,115 there |
| Month: July | 89.9% | routes of similar length | 69.7% | +20.2 pts | 656 here, 213,324 there |
| Airline: Delta Air Lines | 91.5% | routes of similar length | 81.8% | +9.7 pts | 3,046 here, 416,024 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 584 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
When it goes wrong
July 2023 – July 2026
11 min late
against a median of 13 min early
Percentiles over 5,660 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at SLC after arriving from SJC.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 18% | High risk |
| 45 min | 8.2% | Some risk |
| 60 min | 5.4% | Some risk |
| 90 min | 3.2% | Low risk |
| 120 min | 1.9% | Low risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 0.34% of the time and diverts 0.07% of the time, which a late arrival never shows up in.
Chance of missing is the share of 5,637 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 11 minutes late (90th-percentile gate arrival delay), over 5,660 operations.
Any other layover length: connection checker.
Best time to fly
SJC → SLC flights departing 5–9 AM arrived on time 94.4% of the time, against 88.2% for 12–3 PM departures, a gap of 6.2 percentage points.
By departure window
By departure hour
- 12 AM to 4 AM: too few flights to score
- 5 AM: 96.3% on time from 512 flights
- 6 AM: 92.9% on time from 615 flights
- 7 AM to 8 AM: too few flights to score
- 9 AM: 94.7% on time from 640 flights
- 10 AM: 92.2% on time from 659 flights
- 11 AM: too few flights to score
- 12 PM: 92.9% on time from 229 flights
- 1 PM: 87.5% on time from 1,063 flights
- 2 PM: 87.0% on time from 184 flights
- 3 PM: too few flights to score
- 4 PM: 88.7% on time from 257 flights
- 5 PM: 92.4% on time from 827 flights
- 6 PM: too few flights to score
- 7 PM: 90.9% on time from 453 flights
- 8 PM to 11 PM: too few flights to score
Why SJC → SLC runs late
July 2023 – July 2026
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for SJC → SLC. Only delays of 15 minutes or more are attributed. What the five causes mean
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| Delta Air Lines | 3,066 | 91.5% | 0.55% | -15 min | 3.7% |
| SkyWest Airlines | 1,753 | 94.0% | 0.06% | -13 min | 2.3% |
| Southwest Airlines | 841 | 86.0% | 0.12% | -6 min | 3.7% |
Delta Air Lines flew 54.2% of the 5,660 flights listed.
SkyWest Airlines arrived on time 8.0 percentage points more often than Southwest Airlines on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| DL1314 Delta Air Lines | 6:00 AM | 785 | 94.2% |
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Sunday the least, a gap of 5.8 percentage points.
By month
- Jan: 92.3%
- Feb: 93.8%
- Mar: 91.7%
- Apr: 92.1%
- May: 90.9%
- Jun: 88.3%
- Jul: 89.9%
- Aug: 89.4%
- Sep: 92.2%
- Oct: 91.7%
- Nov: 94.1%
- Dec: 92.7%
June is historically the weakest month and November the strongest, a spread of 5.8 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 92.0% from 153 flights
- August 2023: 86.4% from 155 flights
- September 2023: 89.9% from 170 flights
- October 2023: 90.2% from 175 flights
- November 2023: 97.0% from 166 flights
- December 2023: 92.8% from 152 flights
- January 2024: 86.7% from 150 flights
- February 2024: 95.6% from 136 flights
- March 2024: 90.6% from 149 flights
- April 2024: 91.5% from 142 flights
- May 2024: 89.7% from 146 flights
- June 2024: 86.3% from 161 flights
- July 2024: 90.1% from 168 flights
- August 2024: 89.0% from 164 flights
- September 2024: 94.4% from 162 flights
- October 2024: 92.8% from 166 flights
- November 2024: 91.6% from 154 flights
- December 2024: 92.0% from 138 flights
- January 2025: 95.4% from 130 flights
- February 2025: 91.9% from 123 flights
- March 2025: 92.5% from 146 flights
- April 2025: 92.1% from 139 flights
- May 2025: 91.6% from 166 flights
- June 2025: 89.5% from 172 flights
- July 2025: 89.8% from 176 flights
- August 2025: 92.7% from 166 flights
- September 2025: 92.4% from 158 flights
- October 2025: 92.3% from 168 flights
- November 2025: 93.4% from 155 flights
- December 2025: 93.3% from 137 flights
- January 2026: 96.0% from 124 flights
- February 2026: 93.6% from 126 flights
- March 2026: 92.0% from 138 flights
- April 2026: 92.6% from 135 flights
- May 2026: 91.4% from 162 flights
- June 2026: 89.0% from 163 flights
- July 2026: 88.1% from 169 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 92.1% against 91.8% in the 12 months before — broadly unchanged.
Data and methodology
Calculated by FlyerIntel from 5,660 SJC → SLC flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed