74% of flights from San Francisco to Salt Lake City arrived on time over the past 12 months. That is worse than the typical U.S. route. The 5 a.m. departures ran on time 96% of the time; the 4 p.m. ones 59%. Most reliable airline: Delta Air Lines (75%). 9% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for SFO → SLC: when a flight was late, it was under 45 minutes late 54% of the time. About 1 in 12 flights landed an hour or more late, and 1 in 84 three hours or more; 1.0% were cancelled outright.
- On time or early74%
- 15–30 min late8.3%
- 30–60 min late8.3%
- 1–2 hours late5.2%
- 2–3 hours late1.6%
- 3+ hours late1.2%
- Diverted0.1%
- Cancelled1.0%
Share of all 3,451 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Delta Air Lines | 1,718 | 75% | 0.9% | −7 min | 7.7% | +74 min | Delta Air Lines 100%, SkyWest 0% |
| United Airlines | 1,448 | 75% | 1.0% | −5 min | 7.9% | +63 min | SkyWest 65%, United Airlines 35% |
| Frontier Airlines | 206 | 65% | 1.9% | 0 min | 11.7% | +76 min | Frontier Airlines |
| Alaska Airlines | 79 | — | — | — | — | — | SkyWest 75%, Horizon Air 25% |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at SFO). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Delta Air Lines | United Airlines | Frontier Airlines |
|---|---|---|---|
| 5 a.m. | 96% | — | — |
| 6 a.m. | 94% | — | — |
| 8 a.m. | — | 91% | — |
| 9 a.m. | 74% | 86% | — |
| noon | — | 74% | — |
| 1 p.m. | 64% | 62% | — |
| 4 p.m. | — | 64% | — |
| 5 p.m. | 67% | — | 64% |
| 6 p.m. | — | 81% | — |
| 7 p.m. | 78% | — | — |
| 8 p.m. | — | 65% | — |
Last flight of the day
On SFO → SLC, each airline's last flight of the day was cancelled 1.1% of the time, against 0.9% for its earlier flights, about the same. It arrived 3+ hours late 1.4% of the time (earlier flights: 1.1%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| Delta Air Lines | 7:24 p.m. | 1.4% | 2.5% | 0.8% | first flight 5:50 a.m. |
| United Airlines | 8:54 p.m. | 0.8% | 0.3% | 1.0% | first flight 8:40 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
By month
Each calendar month pooled over 2023–2026. Best: October (87%). Worst: June (72%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 540 | 68% | 1.7% |
| Tuesday | 453 | 81% | 0.4% |
| Wednesday | 475 | 77% | 0.6% |
| Thursday | 507 | 71% | 0.6% |
| Friday | 532 | 72% | 0.9% |
| Saturday | 421 | 80% | 1.4% |
| Sunday | 523 | 73% | 1.3% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 19 · air traffic/airport 14 · weather 2
Month by month
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| DL 1331 | 6:00 a.m. | 365 | 96% | 0.5% | −14 min | Delta Air Lines |
| DL 920 | 9:55 a.m. | 361 | 75% | 1.7% | −7 min | Delta Air Lines |
| DL 902 | 1:20 p.m. | 287 | 65% | 0.4% | +3 min | Delta Air Lines |
| DL 1088 | 4:55 p.m. | 358 | 65% | 1.1% | +2 min | Delta Air Lines |
| UA 5753 | 8:54 p.m. | 164 | 65% | 1.2% | +1 min | SkyWest |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Apr 20, 2026 | 11 | 18% | 4 |
| Dec 22, 2025 | 11 | 18% | 0 |
| Dec 26, 2025 | 11 | 18% | 1 |
| Dec 23, 2025 | 10 | 20% | 0 |
| Jun 14, 2026 | 10 | 20% | 0 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of San Francisco or Salt Lake City. SJC → SLC has been 17 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| SFO → SLC (this route) | 3,451 | 74% | 1.0% |
| SJC → SLC San Jose to Salt Lake City | 1,794 | 91% | 0.4% |
| OAK → SLC Oakland to Salt Lake City | 1,621 | 88% | 0.1% |
Questions
How often are flights from SFO to SLC on time?
74% of 3,451 scheduled flights from San Francisco, CA to Salt Lake City, UT arrived within 15 minutes of schedule between September 2025 and August 2026. 1.0% were cancelled.
What is the best time of day to fly SFO to SLC?
Flights scheduled to leave at 5 a.m. were the most reliable (96% on time). The 4 p.m. departures were the least (59%).
Which airline is most on time from SFO to SLC?
Delta Air Lines: 75% of its 1,718 flights on the route arrived on time. United Airlines: 75%. Frontier Airlines: 65%.
What month has the most delays from SFO to SLC?
June (72% on time). The best month is October (87%), over 2023–2026.
Is the last flight of the day from SFO to SLC more likely to be cancelled?
Not much. Each airline's last SFO–SLC flight of the day was cancelled 1.1% of the time over the past year, against 0.9% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- SLC → SFO (return)
- San Francisco (SFO) delays by hour
- Flights into Salt Lake City (SLC)
- Delta Air Lines on-time record
- United Airlines on-time record
- Frontier Airlines on-time record
- Alaska Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.