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Route Reliability

Atlanta → Ontario

ATL–ONT · 1,900 miles · Hartsfield–Jackson Atlanta International Airport to Ontario International Airport

77
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
8 min
Average arrival delay
1.7%
Cancelled
941
Flights in the data

Data through May 2026.

Delta Air Lines is the only airline in this data on this route, arriving on time 77% of the time across 941 flights. No comparison to make.

What the data says

Morning-you made the right choice.

ATL–ONT flights departing between 6–9 AM arrived on time 89% of the time, versus 53% between 9 PM–12 AM.

Skip Tuesday if you can.

ATL–ONT flights arrived on time 81% of the time on Wednesdays. On Tuesdays: 73%.

Ticking up lately.

ATL–ONT flights arrived on time 80% of the time over the last three months in the data, compared with 73% 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
  • Mon74%(137 flights)
  • Tue73%(136 flights)
  • Wed81%(134 flights)
  • Thu79%(134 flights)
  • Fri77%(133 flights)
  • Sat76%(112 flights)
  • Sun76%(138 flights)
On-time by departure window
  • 6–9 AM89%(54 flights)
  • 9 AM–12 PM86%(303 flights)
  • 3–6 PM72%(209 flights)
  • 6–9 PM74%(282 flights)
  • 9 PM–12 AM53%(76 flights)
On-time trend by month
74%
May

Jun 60% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%82
July 202574%87
August 202579%81
September 202584%77
October 202582%85
November 202583%83
December 202573%84
January 202673%60
February 202673%56
March 202688%60
April 202677%78
May 202674%91

Same trip, other airports

Keep nerding

Based on 941 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.