ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.
ONT → SLC
Ontario to Salt Lake City: 1,240 nonstop flights a year
On time (12 months)
91%
Cancelled
1.0%
avg delay 8 min
Best time to leave
9 AM to noon
97% on time vs 86% noon to 3 PM
Most reliable airline
SkyWest
91% chance on time
Lowest nonstop fare seen in the next two months: $329 (Southwest 2424 on 2026-10-30). 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 · Delta 1302
9:50 AM → 12:40 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
95%
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 (9 AM to noon: 97% on time; Noon to 3 PM: 86%).
- 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#2 · Delta 2708
6:00 AM → 8:50 AM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
95%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.5%
- Avg arrival delay
- 6 min
- Arrived on time 95% of the time (363 flights, Jun 2025 to May 2026).
Strong track record · 363 flights
Find Delta 2708 fares Opens this date on Aviasales#3 · SkyWest 3762 · sold as United Express, Delta Connection, American Eagle or Alaska
4:57 PM → 7:49 PM1h 52m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
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 4:57 PM flight fares Opens this date on Aviasales#4 · SkyWest 3809 · sold as United Express, Delta Connection, American Eagle or Alaska
5:05 PM → 8:00 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.
91%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 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 5:05 PM flight fares Opens this date on Aviasales#5 · Frontier 1122
9:12 AM → 12:04 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-04.
90%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 83% of the time (24 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 97% on time; Noon to 3 PM: 86%).
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find Frontier 1122 fares Opens this date on Aviasales#6 · Delta 1006
1:29 PM → 4:18 PM1h 49m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 96% of the time (25 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 86% on time; 9 AM to noon: 97%).
- Short track record (25 flights), so its score leans on the airline's record at this hour.
Limited track record · 25 flights
Find Delta 1006 fares Opens this date on Aviasales#7 · Delta 475
1:20 PM → 4:09 PM1h 49m nonstop
Local times, typical schedule. Last flown 2026-05-06.
83%
chance on time
- On time (history)
- 82%
- Cancelled
- 1.6%
- Avg arrival delay
- 16 min
- Arrived on time 82% of the time (119 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 86% on time; 9 AM to noon: 97%).
Moderate track record · 119 flights
Find Delta 475 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)91%
304 flights · 92% on time as flown · 0.5% cancel
- Delta Air Lines90%
906 flights · 91% on time as flown · 1.2% cancel
- Frontier Airlines89%
30 flights · 87% on time as flown · 0.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM95%
368 flights · avg delay 6 min
- 9 AM to noon97%
163 flights · avg delay 4 min
- Noon to 3 PM86%
365 flights · avg delay 11 min
- 3 to 6 PM92%
340 flights · avg delay 8 min
Best day: Tuesday (95%). Worst: Monday (90%).
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