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Route Reliability

Ontario → Oakland

ONT–OAK · 362 miles · Ontario International Airport to Oakland International Airport

94
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
2 min early
Average arrival delay
0.4%
Cancelled
1,514
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 87% of the time across 1,514 flights. No comparison to make.

What the data says

Morning-you made the right choice.

ONT–OAK flights departing between 3–6 AM arrived on time 96% of the time, versus 72% between 9 PM–12 AM.

Sunday scaries are real for this one.

ONT–OAK flights arrived on time 91% of the time on Wednesdays. On Sundays: 79%.

Flights on this route

The breakdown

On-time by weekday
  • Mon88%(235 flights)
  • Tue91%(207 flights)
  • Wed91%(204 flights)
  • Thu88%(232 flights)
  • Fri86%(230 flights)
  • Sat90%(161 flights)
  • Sun79%(239 flights)
On-time by departure window
  • 3–6 AM96%(84 flights)
  • 6–9 AM96%(249 flights)
  • 9 AM–12 PM94%(322 flights)
  • 12–3 PM87%(153 flights)
  • 3–6 PM83%(338 flights)
  • 6–9 PM78%(308 flights)
  • 9 PM–12 AM72%(54 flights)
On-time trend by month
81%
May

Jun 84% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202584%135
July 202589%135
August 202590%135
September 202591%133
October 202582%136
November 202584%126
December 202581%121
January 202691%118
February 202690%114
March 202697%121
April 202686%116
May 202681%118

Same trip, other airports

Keep nerding

Based on 1,514 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.