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Flight Reliability

DL 1177 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1177 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

92%
Arrive within 15 minutes
4 min early
Average arrival delay
0.8%
Cancelled
10 min early
Median arrival delay

Based on 728 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon96%(104 flights)
  • Tue93%(102 flights)
  • Wed90%(103 flights)
  • Thu89%(104 flights)
  • Fri91%(104 flights)
  • Sat91%(97 flights)
  • Sun94%(106 flights)
On-time by departure window
  • 6–9 AM92%(360 flights)
  • 9 AM–12 PM92%(360 flights)
On-time trend by month
97%
May

Jun 88% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%60
July 202589%61
August 202587%62
September 202583%60
October 202598%62
November 202586%56
December 202592%62
January 202692%62
February 202698%55
March 202698%60
April 202698%60
May 202697%60
Departures on time
93%
Diverted
0.3%
Flights flown
720
Months covered
12

Keep nerding

Based on 728 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.