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Flight Reliability

DL 779 · Delta Air Lines

Atlanta → Ontario (ATL–ONT)91% of its flights flew this route. The rest (DCA–SEA) are included in these numbers.

67
Usually Fine
WanderNerd Reliability Score
69%
Arrive within 15 minutes
15 min
Average arrival delay
1.4%
Cancelled
3 min
Median arrival delay

Based on 282 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 779 departing between 6–9 PM arrived on time 75% of the time, versus 53% between 9 PM–12 AM.

Mondays have been rough.

DL 779 arrived on time 79% of the time on Fridays and just 51% on Mondays. That gap is worth planning around.

Lagging the ATL–ONT route.

DL 779 arrived on time 69% of the time, versus 77% across the ATL–ONT route.

Lagging the Delta Air Lines network.

DL 779 arrived on time 69% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon51%(43 flights)
  • Tue61%(43 flights)
  • Wed78%(41 flights)
  • Thu71%(41 flights)
  • Fri79%(42 flights)
  • Sat77%(26 flights)
  • Sun68%(41 flights)
On-time by departure window
  • 3–6 PM70%(23 flights)
  • 6–9 PM75%(178 flights)
  • 9 PM–12 AM53%(76 flights)
On-time trend by month
83%
May

Jun 42% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202542%26
July 202546%28
August 202565%20
September 202588%17
October 202587%23
November 202572%25
December 202554%28
January 202668%28
February 202674%27
April 202689%18
May 202683%30
Departures on time
70%
Diverted
0.4%
Flights flown
277
Months covered
12

Same route, other flights

Keep nerding

Based on 282 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.