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Flight Reliability

DL 635 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 635 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

76%
Arrive within 15 minutes
6 min
Average arrival delay
0.6%
Cancelled
4 min early
Median arrival delay

Based on 326 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(53 flights)
  • Tue84%(38 flights)
  • Wed64%(39 flights)
  • Thu76%(54 flights)
  • Fri73%(51 flights)
  • Sat91%(33 flights)
  • Sun76%(54 flights)
On-time by departure window
  • 6–9 AM—(4 flights)
  • 9 AM–12 PM—(4 flights)
  • 3–6 PM—(3 flights)
  • 6–9 PM76%(106 flights)
  • 9 PM–12 AM76%(205 flights)
On-time trend by month
67%
May

Jun 75% → May 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202575%28
July 202558%19
August 202556%32
September 202583%35
October 202568%31
November 202575%24
December 202581%31
January 202693%30
February 202686%28
March 202685%20
April 202682%17
May 202667%27
Departures on time
77%
Diverted
0.6%
Flights flown
322
Months covered
12

Keep nerding

Based on 326 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.