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Route on-time record

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

Sacramento (Sacramento International Airport) to Ontario (Ontario International Airport). 2,110 nonstop flights in Jun 2025 to May 2026, 85% arrived within 15 minutes and 0.2% were cancelled. The most reliable flight number was Southwest 2985 at 5:55 AM.

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

SMF → ONT

Sacramento to Ontario: 2,110 nonstop flights a year

On time (12 months)

85%

Cancelled

0.2%

avg delay 9 min

Best time to leave

Before 9 AM

94% on time vs 78% 6 to 9 PM

Most reliable airline

Southwest

85% chance on time

Check SMF to ONT fares

Lowest nonstop fare seen in the next two months: $348 (Southwest 3947 on 2026-10-23). 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 2985

    5:55 AM → 7:15 AM1h 20m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3173; its record covers all of them.

    95%

    chance on time

    On time (history)
    98%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 98% of the time (61 flights, Jun 2025 to May 2026).
    • Never cancelled in 61 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 78%).

    Moderate track record · 61 flights

    Find Southwest 2985 fares Opens this date on Aviasales

  2. #2 · Southwest 3325

    6:45 AM → 8:05 AM1h 20m nonstop

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

    94%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 96% of the time (24 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 78%).
    • Short track record (24 flights), so its score leans on the airline's record at this hour.

    Limited track record · 24 flights

    Find Southwest 3325 fares Opens this date on Aviasales

  3. #3 · Southwest 4489

    9:10 AM → 10:35 AM1h 25m nonstop

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

    93%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (15 flights, Jun 2025 to May 2026).
    • Short track record (15 flights), so its score leans on the airline's record at this hour.

    Limited track record · 15 flights

    Find Southwest 4489 fares Opens this date on Aviasales

  4. #4 · Southwest 4226

    9:00 AM → 10:25 AM1h 25m nonstop

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

    93%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 95% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 scheduled flights.
    • Short track record (39 flights), so its score leans on the airline's record at this hour.

    Limited track record · 39 flights

    Find Southwest 4226 fares Opens this date on Aviasales

  5. #5 · Southwest 4576

    2:30 PM → 3:50 PM1h 20m nonstop

    Local times, typical schedule. Last flown 2026-05-27.

    88%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 94% of the time (16 flights, Jun 2025 to May 2026).
    • Short track record (16 flights), so its score leans on the airline's record at this hour.

    Limited track record · 16 flights

    Find Southwest 4576 fares Opens this date on Aviasales

  6. #6 · Southwest 3452

    1:05 PM → 2:30 PM1h 25m nonstop

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

    86%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 91% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 3452 fares Opens this date on Aviasales

  7. #7 · Southwest 1853

    8:40 AM → 10:00 AM1h 20m nonstop

    Local times, typical schedule. Last flown 2026-04-01.

    86%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 78%).
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 1853 fares Opens this date on Aviasales

  8. #8 · Southwest 4490

    11:45 AM → 1:05 PM1h 20m nonstop

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

    85%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 86% of the time (28 flights, Jun 2025 to May 2026).
    • Short track record (28 flights), so its score leans on the airline's record at this hour.

    Limited track record · 28 flights

    Find Southwest 4490 fares Opens this date on Aviasales

  9. #9 · Southwest 4357

    6:20 PM → 7:45 PM1h 25m nonstop

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

    85%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 87% of the time (23 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 78% on time; Before 9 AM: 94%).
    • 63% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 4357 fares Opens this date on Aviasales

  10. #10 · Southwest 1040

    6:30 PM → 7:50 PM1h 20m nonstop

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

    84%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    22 min
    • Arrived on time 87% of the time (15 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 78% on time; Before 9 AM: 94%).
    • Short track record (15 flights), so its score leans on the airline's record at this hour.

    Limited track record · 15 flights

    Find Southwest 1040 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines85%

    2,110 flights · 85% on time as flown · 0.2% cancel

On time by departure time

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

  • Before 9 AM94%

    532 flights · avg delay 3 min

  • 9 AM to noon89%

    411 flights · avg delay 6 min

  • Noon to 3 PM83%

    307 flights · avg delay 9 min

  • 3 to 6 PM80%

    321 flights · avg delay 10 min

  • 6 to 9 PM78%

    502 flights · avg delay 15 min

Best day: Wednesday (89%). Worst: Thursday (83%).

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
91
F
88
M
87
A
85
M
84
J
79
J
84
A
89
S
88
O
85
N
87
D
86

What delays this route

  • Late-arriving aircraft65%
  • Airline (crew, maintenance, boarding)29%
  • Air traffic control and airport volume5%

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

SMF to ONT questions

What time of day is best to fly SMF to ONT?
Before 9 AM: 94% 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 SMF to ONT?
Southwest, with a season-adjusted 85% chance of operating and arriving on time over 2,110 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 SMF to ONT?
June (79% on time); the best was January (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 SMF

Live status: FAA delays and ground stops