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Route Reliability

San Francisco → Ontario

SFO–ONT · 363 miles · San Francisco International Airport to Ontario International Airport

82
Pretty Reliable
WanderNerd Reliability Score
78%
Arrive within 15 minutes
11 min
Average arrival delay
0.9%
Cancelled
1,275
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines81%1,114 flights
  2. 2.Frontier Airlines56%161 flights

What the data says

The late departure is the smart one here.

SFO–ONT flights departing between 6–9 PM arrived on time 95% of the time, versus 67% between 9 PM–12 AM.

Friday is doing you no favors.

SFO–ONT flights arrived on time 86% of the time on Tuesdays. On Fridays: 74%.

United Airlines has a clear lead on this route.

United Airlines arrived on time 81% of the time on this route; Frontier Airlines managed 56%.

Ticking up lately.

SFO–ONT flights arrived on time 85% of the time over the last three months in the data, compared with 79% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon75%(208 flights)
  • Tue86%(152 flights)
  • Wed81%(152 flights)
  • Thu75%(179 flights)
  • Fri74%(205 flights)
  • Sat83%(159 flights)
  • Sun78%(209 flights)
On-time by departure window
  • 6–9 AM87%(83 flights)
  • 9 AM–12 PM84%(346 flights)
  • 3–6 PM82%(359 flights)
  • 6–9 PM95%(55 flights)
  • 9 PM–12 AM67%(421 flights)
On-time trend by month
80%
May

Jun 73% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%104
July 202571%104
August 202578%108
September 202578%108
October 202575%114
November 202572%103
December 202576%102
January 202683%90
February 202677%79
March 202692%103
April 202683%124
May 202680%125

Same trip, other airports

Keep nerding

Based on 1,275 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.