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Route on-time record

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

Ontario (Ontario International Airport) to San Jose (Norman Y. Mineta San Jose International Airport). 1,319 nonstop flights in Jun 2025 to May 2026, 86% arrived within 15 minutes and 0.1% were cancelled. The most reliable flight number was Southwest 2057 at 6:10 AM.

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

ONT → SJC

Ontario to San Jose: 1,319 nonstop flights a year

On time (12 months)

86%

Cancelled

0.1%

avg delay 9 min

Best time to leave

Before 9 AM

98% on time vs 71% 6 to 9 PM

Most reliable airline

Southwest

86% chance on time

Check ONT to SJC 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 2057

    6:10 AM → 7:25 AM1h 15m nonstop

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

    97%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (54 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 98% on time; 6 to 9 PM: 71%).
    • Short track record (54 flights), so its score leans on the airline's record at this hour.

    Limited track record · 54 flights

    Find Southwest 2057 fares Opens this date on Aviasales

  2. #2 · Southwest 2034

    6:25 AM → 7:45 AM1h 20m 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: 98% on time; 6 to 9 PM: 71%).
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 2034 fares Opens this date on Aviasales

  3. #3 · Southwest 106

    10:30 AM → 11:45 AM1h 15m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3223; its record covers all of them.

    92%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 93% of the time (46 flights, Jun 2025 to May 2026).
    • Never cancelled in 46 scheduled flights.
    • Short track record (46 flights), so its score leans on the airline's record at this hour.

    Limited track record · 46 flights

    Find Southwest 106 fares Opens this date on Aviasales

  4. #4 · Southwest 4080

    12:50 PM → 2:05 PM1h 15m nonstop

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

    91%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    3 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 4080 fares Opens this date on Aviasales

  5. #5 · Southwest 3078

    12:30 PM → 1:45 PM1h 15m nonstop

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

    91%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    2 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 3078 fares Opens this date on Aviasales

  6. #6 · Southwest 752

    3:05 PM → 4:25 PM1h 20m nonstop

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

    82%

    chance on time

    On time (history)
    76%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 76% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • 80% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 752 fares Opens this date on Aviasales

  7. #7 · Southwest 3673

    3:55 PM → 5:10 PM1h 15m nonstop

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

    79%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 73% of the time (30 flights, Jun 2025 to May 2026).
    • Never cancelled in 30 scheduled flights.
    • 75% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (30 flights), so its score leans on the airline's record at this hour.

    Limited track record · 30 flights

    Find Southwest 3673 fares Opens this date on Aviasales

  8. #8 · Southwest 3674

    6:50 PM → 8:00 PM1h 10m nonstop

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

    76%

    chance on time

    On time (history)
    71%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 71% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Leaves in this route's least on-time window (6 to 9 PM: 71% on time; Before 9 AM: 98%).
    • 80% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 55 flights

    Find Southwest 3674 fares Opens this date on Aviasales

  9. #9 · Southwest 2041

    7:00 PM → 8:15 PM1h 15m nonstop

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

    75%

    chance on time

    On time (history)
    78%
    Cancelled
    0.0%
    Avg arrival delay
    32 min
    • Arrived on time 78% of the time (23 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 71% on time; Before 9 AM: 98%).
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 2041 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines86%

    1,319 flights · 86% on time as flown · 0.1% cancel

On time by departure time

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

  • Before 9 AM98%

    334 flights · avg delay 1 min

  • 9 AM to noon96%

    232 flights · avg delay 2 min

  • Noon to 3 PM90%

    160 flights · avg delay 8 min

  • 3 to 6 PM78%

    291 flights · avg delay 13 min

  • 6 to 9 PM71%

    294 flights · avg delay 18 min

Best day: Tuesday (92%). Worst: Sunday (80%).

Smarter routing

Nearby airports that run more on time

  • LAX → MRY 91% chance on time

    Los Angeles International Airport to Monterey Regional Airport · 855 flights a year · 101 mi from your airports · yours: 86%

    Rank flightsFares

  • LGB → OAK 89% chance on time

    Long Beach International Airport to Oakland San Francisco Bay Airport · 1,649 flights a year · 65 mi from your airports · yours: 86%

    Rank flightsFares

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
91
M
87
A
87
M
85
J
87
J
82
A
87
S
87
O
87
N
88
D
91

What delays this route

  • Late-arriving aircraft79%
  • Airline (crew, maintenance, boarding)19%
  • 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 SJC questions

What time of day is best to fly ONT to SJC?
Before 9 AM: 98% of flights arrived on time, against 71% 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 SJC?
Southwest, with a season-adjusted 86% chance of operating and arriving on time over 1,319 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 SJC?
July (82% 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 ONT

Live status: FAA delays and ground stops