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Flight Reliability

DL 1217 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1217 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

82%
Arrive within 15 minutes
5 min
Average arrival delay
0.2%
Cancelled
9 min early
Median arrival delay

Based on 428 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon75%(63 flights)
  • Tue87%(62 flights)
  • Wed90%(60 flights)
  • Thu88%(59 flights)
  • Fri79%(57 flights)
  • Sat78%(63 flights)
  • Sun79%(62 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 9 AM–12 PM—(2 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM85%(256 flights)
  • 9 PM–12 AM77%(166 flights)
On-time trend by month
77%
May

Jul 76% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
July 202576%25
August 202588%51
September 202598%60
October 202583%58
November 202577%60
December 202569%16
January 202681%31
February 202686%28
March 202667%30
April 202677%30
May 202677%31
Departures on time
82%
Diverted
0.2%
Flights flown
426
Months covered
12

Keep nerding

Based on 428 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.