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Flight Reliability

DL 3688 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 3688 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

85%
Arrive within 15 minutes
3 min early
Average arrival delay
0.3%
Cancelled
10 min early
Median arrival delay

Based on 586 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon88%(96 flights)
  • Tue88%(75 flights)
  • Wed82%(73 flights)
  • Thu86%(92 flights)
  • Fri86%(91 flights)
  • Sat92%(60 flights)
  • Sun79%(97 flights)
On-time by departure window
  • 12–3 PM84%(25 flights)
  • 3–6 PM88%(335 flights)
  • 6–9 PM83%(224 flights)
On-time trend by month
79%
May

Jun 82% → May 79% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%55
July 202589%54
August 202579%47
September 202593%42
October 202591%46
November 202597%37
December 202592%49
January 202685%41
February 202679%42
March 202685%54
April 202680%56
May 202679%61
Departures on time
89%
Diverted
0%
Flights flown
584
Months covered
12

Keep nerding

Based on 586 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.