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Flight Reliability

DL 1645 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1645 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

81%
Arrive within 15 minutes
9 min
Average arrival delay
1.4%
Cancelled
8 min early
Median arrival delay

Based on 281 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(37 flights)
  • Tue79%(38 flights)
  • Wed76%(38 flights)
  • Thu84%(37 flights)
  • Fri83%(36 flights)
  • Sat83%(52 flights)
  • Sun79%(38 flights)
On-time by departure window
  • 6–9 AM95%(109 flights)
  • 9 AM–12 PM85%(26 flights)
  • 12–3 PM85%(46 flights)
  • 6–9 PM61%(95 flights)
On-time trend by month
97%
May

Jun 72% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%29
July 202557%28
August 202560%10
October 202563%27
November 202569%16
December 202588%16
January 202683%29
February 202689%28
March 202690%31
April 2026100%30
May 202697%31
Departures on time
81%
Diverted
0.4%
Flights flown
276
Months covered
12

Keep nerding

Based on 281 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.