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Route Reliability

San Jose → Ontario

SJC–ONT · 333 miles · San José Mineta International Airport to Ontario International Airport

92
Nerd Approved
WanderNerd Reliability Score
85%
Arrive within 15 minutes
1 min
Average arrival delay
0%
Cancelled
1,317
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 85% of the time across 1,317 flights. No comparison to make.

What the data says

Morning flights do better here.

SJC–ONT flights departing between 6–9 AM arrived on time 98% of the time, versus 44% between 9 PM–12 AM.

Sunday scaries are real for this one.

SJC–ONT flights arrived on time 92% of the time on Wednesdays and just 76% on Sundays. That gap is worth planning around.

It basically never cancels.

Out of 1,317 scheduled flights, only 0.0% were cancelled.

Flights on this route

The breakdown

On-time by weekday
  • Mon84%(207 flights)
  • Tue90%(174 flights)
  • Wed92%(171 flights)
  • Thu83%(202 flights)
  • Fri81%(202 flights)
  • Sat90%(156 flights)
  • Sun76%(204 flights)
On-time by departure window
  • 6–9 AM98%(363 flights)
  • 9 AM–12 PM87%(268 flights)
  • 12–3 PM91%(126 flights)
  • 3–6 PM76%(235 flights)
  • 6–9 PM77%(276 flights)
  • 9 PM–12 AM44%(48 flights)
On-time trend by month
85%
May

Jun 80% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%115
July 202581%118
August 202585%110
September 202585%106
October 202572%110
November 202588%116
December 202586%118
January 202690%101
February 202690%99
March 202690%107
April 202687%106
May 202685%110

Same trip, other airports

Keep nerding

Based on 1,317 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.