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Route Reliability

Ontario → Atlanta

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

88
Pretty Reliable
WanderNerd Reliability Score
90%
Arrive within 15 minutes
2 min early
Average arrival delay
1.8%
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 90% of the time across 941 flights. No comparison to make.

What the data says

The late departure is the smart one here.

ONT–ATL flights departing between 9 PM–12 AM arrived on time 93% of the time, versus 81% between 12–3 PM.

Wednesday has been the better bet.

A small edge: 94% on time on Wednesdays against 88% on Mondays.

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
  • Mon88%(136 flights)
  • Tue92%(135 flights)
  • Wed94%(134 flights)
  • Thu91%(132 flights)
  • Fri90%(132 flights)
  • Sat88%(110 flights)
  • Sun89%(137 flights)
On-time by departure window
  • 6–9 AM93%(261 flights)
  • 9 AM–12 PM91%(165 flights)
  • 12–3 PM81%(188 flights)
  • 9 PM–12 AM93%(302 flights)
On-time trend by month
87%
May

Jun 89% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202589%80
July 202593%85
August 202596%81
September 202597%77
October 202591%84
November 202589%82
December 202589%84
January 202677%61
February 202695%56
March 202688%57
April 202691%77
May 202687%92

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.