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Route Reliability

Oakland → Ontario

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

90
Nerd Approved
WanderNerd Reliability Score
84%
Arrive within 15 minutes
2 min
Average arrival delay
0.4%
Cancelled
1,512
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 84% of the time across 1,512 flights. No comparison to make.

What the data says

Morning-you made the right choice.

OAK–ONT flights departing between 3–6 AM arrived on time 100% of the time, versus 69% between 9 PM–12 AM.

Skip Thursday if you can.

OAK–ONT flights arrived on time 90% of the time on Wednesdays. On Thursdays: 78%.

Recent months have been rougher.

OAK–ONT flights arrived on time 77% of the time over the last three months in the data, compared with 88% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon85%(233 flights)
  • Tue86%(207 flights)
  • Wed90%(202 flights)
  • Thu78%(232 flights)
  • Fri81%(232 flights)
  • Sat88%(159 flights)
  • Sun84%(240 flights)
On-time by departure window
  • 3–6 AM100%(27 flights)
  • 6–9 AM98%(333 flights)
  • 9 AM–12 PM88%(251 flights)
  • 12–3 PM87%(280 flights)
  • 3–6 PM76%(257 flights)
  • 6–9 PM72%(322 flights)
  • 9 PM–12 AM69%(35 flights)
On-time trend by month
77%
May

Jun 84% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202584%135
July 202586%134
August 202588%135
September 202588%133
October 202583%136
November 202586%125
December 202579%121
January 202694%119
February 202690%115
March 202678%120
April 202676%115
May 202677%117

Same trip, other airports

Keep nerding

Based on 1,512 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.