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Route on-time record

ONT to SMF: most on-time flights and the best time to fly

Ontario (Ontario International Airport) to Sacramento (Sacramento International Airport). 2,108 nonstop flights in Jun 2025 to May 2026, 86% arrived within 15 minutes and 0.2% were cancelled. The most reliable flight number was Southwest 3676 at 9:00 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

ONT → SMF

Ontario to Sacramento: 2,108 nonstop flights a year

On time (12 months)

86%

Cancelled

0.2%

avg delay 8 min

Best time to leave

Before 9 AM

97% on time vs 78% 6 to 9 PM

Most reliable airline

Southwest

86% chance on time

Check ONT to SMF fares

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. #1 · Southwest 3676

    9:00 AM → 10:25 AM1h 25m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1652; its record covers all of them.

    97%

    chance on time

    On time (history)
    100%
    Cancelled
    1.3%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (78 flights, Jun 2025 to May 2026).

    Moderate track record · 78 flights

    Find Southwest 3676 fares Opens this date on Aviasales

  2. #2 · Southwest 3675

    7:00 AM → 8:10 AM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    96%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 97% on time; 6 to 9 PM: 78%).
    • Short track record (55 flights), so its score leans on the airline's record at this hour.

    Limited track record · 55 flights

    Find Southwest 3675 fares Opens this date on Aviasales

  3. #3 · Southwest 1300

    6:35 AM → 8:05 AM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    95%

    chance on time

    On time (history)
    97%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 97% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 97% on time; 6 to 9 PM: 78%).
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 1300 fares Opens this date on Aviasales

  4. #4 · Southwest 2569

    10:30 AM → 11:55 AM1h 25m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    92%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 2569 fares Opens this date on Aviasales

  5. #5 · Southwest 2764

    12:10 PM → 1:35 PM1h 25m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    88%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 88% of the time (24 flights, Jun 2025 to May 2026).
    • Short track record (24 flights), so its score leans on the airline's record at this hour.

    Limited track record · 24 flights

    Find Southwest 2764 fares Opens this date on Aviasales

  6. #6 · Southwest 2139

    4:10 PM → 5:40 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    87%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find Southwest 2139 fares Opens this date on Aviasales

  7. #7 · Southwest 384

    11:00 AM → 12:30 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    85%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 87% of the time (15 flights, Jun 2025 to May 2026).
    • 91% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (15 flights), so its score leans on the airline's record at this hour.

    Limited track record · 15 flights

    Find Southwest 384 fares Opens this date on Aviasales

  8. #8 · Southwest 4141

    1:45 PM → 3:15 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    83%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 91% of the time (23 flights, Jun 2025 to May 2026).
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 4141 fares Opens this date on Aviasales

  9. #9 · Southwest 1363

    4:25 PM → 5:55 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as Southwest 1856; its record covers all of them.

    83%

    chance on time

    On time (history)
    78%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 78% of the time (46 flights, Jun 2025 to May 2026).
    • Never cancelled in 46 scheduled flights.
    • 79% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (46 flights), so its score leans on the airline's record at this hour.

    Limited track record · 46 flights

    Find Southwest 1363 fares Opens this date on Aviasales

  10. #10 · Southwest 3054

    11:55 AM → 1:25 PM1h 30m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    81%

    chance on time

    On time (history)
    70%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 70% of the time (23 flights, Jun 2025 to May 2026).
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 3054 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines86%

    2,108 flights · 86% on time as flown · 0.2% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM97%

    543 flights · avg delay 2 min

  • 9 AM to noon91%

    343 flights · avg delay 5 min

  • Noon to 3 PM83%

    339 flights · avg delay 9 min

  • 3 to 6 PM82%

    361 flights · avg delay 10 min

  • 6 to 9 PM78%

    504 flights · avg delay 15 min

Best day: Tuesday (90%). Worst: Sunday (82%).

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.

J
86
F
89
M
88
A
86
M
84
J
79
J
85
A
91
S
91
O
86
N
89
D
88

What delays this route

  • Late-arriving aircraft76%
  • Airline (crew, maintenance, boarding)21%
  • Air traffic control and airport volume2%

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

ONT to SMF questions

What time of day is best to fly ONT to SMF?
Before 9 AM: 97% of flights arrived on time, against 78% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from ONT to SMF?
Southwest, with a season-adjusted 86% chance of operating and arriving on time over 2,108 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 ONT to SMF?
June (79% on time); the best was September (91%), 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 ONT

Live status: FAA delays and ground stops