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Flight Reliability

DL 3686 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 3686 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
4 min
Average arrival delay
3.1%
Cancelled
12 min early
Median arrival delay

Based on 521 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(73 flights)
  • Tue85%(73 flights)
  • Wed90%(70 flights)
  • Thu89%(72 flights)
  • Fri85%(71 flights)
  • Sat81%(73 flights)
  • Sun86%(72 flights)
On-time by departure window
  • 9 AM–12 PM91%(301 flights)
  • 12–3 PM83%(120 flights)
  • 3–6 PM69%(83 flights)
On-time trend by month
83%
May

Jun 94% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202594%47
July 202598%52
August 202588%60
September 202590%60
October 202595%60
November 202588%48
December 202575%44
January 202667%30
February 202650%26
April 202681%36
May 202683%35
Departures on time
85%
Diverted
0.2%
Flights flown
504
Months covered
12

Keep nerding

Based on 521 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.