Route on-time record
SLC to ONT: most on-time flights and the best time to fly
Salt Lake City (Salt Lake City International Airport) to Ontario (Ontario International Airport). 1,240 nonstop flights in Jun 2025 to May 2026, 89% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was SkyWest 3762 at 3:23 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SLC → ONT
Salt Lake City to Ontario: 1,240 nonstop flights a year
On time (12 months)
89%
Cancelled
1.0%
avg delay 8 min
Best time to leave
Before 9 AM
95% on time vs 85% 9 AM to noon
Most reliable airline
SkyWest
93% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · SkyWest 3762 · sold as United Express, Delta Connection, American Eagle or Alaska
3:23 PM → 4:17 PM1h 54m nonstop
Local times, typical schedule. Last flown 2026-05-31.
94%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 96% of the time (25 flights, Jun 2025 to May 2026).
- Short track record (25 flights), so its score leans on the airline's record at this hour.
Limited track record · 25 flights
Find 3:23 PM flight fares Opens this date on Aviasales#2 · Delta 1302
8:02 AM → 8:53 AM1h 51m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 100%
- Cancelled
- 5.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (19 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 9 AM to noon: 85%).
- Short track record (19 flights), so its score leans on the airline's record at this hour.
Limited track record · 19 flights
Find Delta 1302 fares Opens this date on Aviasales#3 · SkyWest 3809 · sold as United Express, Delta Connection, American Eagle or Alaska
3:30 PM → 4:25 PM1h 55m nonstop
Local times, typical schedule. Last flown 2026-05-06. Same departure also flew as SkyWest 3829; its record covers all of them.
92%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 90% of the time (60 flights, Jun 2025 to May 2026).
- Never cancelled in 60 scheduled flights.
Moderate track record · 60 flights
Find 3:30 PM flight fares Opens this date on Aviasales#4 · Frontier 1121
8:40 PM → 9:32 PM1h 57m nonstop
Local times, typical schedule. Last flown 2026-05-04.
91%
chance on time
- On time (history)
- 93%
- Cancelled
- 3.3%
- Avg arrival delay
- 7 min
- Arrived on time 93% of the time (29 flights, Jun 2025 to May 2026).
- Cancelled 3.3% of the time (1 of 30).
- Short track record (29 flights), so its score leans on the airline's record at this hour.
Limited track record · 29 flights
Find Frontier 1121 fares Opens this date on Aviasales#5 · Delta 1614
10:56 PM → 11:51 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.6%
- Avg arrival delay
- 11 min
- Arrived on time 86% of the time (347 flights, Jun 2025 to May 2026).
Strong track record · 347 flights
Find Delta 1614 fares Opens this date on Aviasales#6 · Delta 1006
11:30 AM → 12:19 PM1h 49m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Delta 475; its record covers all of them.
80%
chance on time
- On time (history)
- 80%
- Cancelled
- 1.4%
- Avg arrival delay
- 12 min
- Arrived on time 80% of the time (145 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (9 AM to noon: 85% on time; Before 9 AM: 95%).
Moderate track record · 145 flights
Find Delta 1006 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)93%
304 flights · 95% on time as flown · 0.6% cancel
- Frontier Airlines89%
30 flights · 93% on time as flown · 1.4% cancel
- Delta Air Lines86%
906 flights · 87% on time as flown · 1.2% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM95%
152 flights · avg delay 5 min
- 9 AM to noon85%
372 flights · avg delay 10 min
- 3 to 6 PM92%
340 flights · avg delay 5 min
- After 9 PM86%
332 flights · avg delay 11 min
Best day: Tuesday (90%). Worst: Monday (86%).
Smarter routing
Nearby airports that run more on time
PVU → SNA 90% chance on time
Provo Municipal Airport to John Wayne Orange County International Airport · 409 flights a year · 72 mi from your airports · yours: 88%
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)63%
- Late-arriving aircraft24%
- Air traffic control and airport volume8%
- Severe weather5%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
SLC to ONT questions
- What time of day is best to fly SLC to ONT?
- Before 9 AM: 95% of flights arrived on time, against 85% for departures 9 AM to noon. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SLC to ONT?
- SkyWest, with a season-adjusted 93% chance of operating and arriving on time over 304 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on SLC to ONT?
- June (86% on time); the best was October (92%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from SLC
- ONT to SLC (return)
- SLC to DEN 77%
- SLC to PHX 84%
- SLC to SEA 79%
- SLC to LAX 86%
- SLC to DFW 78%
- SLC to LAS 78%
- SLC to SFO 72%
- SLC to ORD 75%
- SLC to ATL 86%
- SLC to SAN 84%
- SLC to PDX 88%
- SLC to SMF 86%
Live status: FAA delays and ground stops