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Flight Reliability

DL 2635 · Delta Air Lines

Seattle → San Francisco (SEA–SFO)97% of its flights flew this route. The rest (MCO–SEA) are included in these numbers.

79
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
9 min
Average arrival delay
1.1%
Cancelled
2 min early
Median arrival delay

Based on 352 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 2635 departing between 9 PM–12 AM arrived on time 76% of the time, versus 56% between 3–6 PM.

Sunday scaries are real for this one.

DL 2635 arrived on time 82% of the time on Saturdays and just 61% on Sundays. That gap is worth planning around.

A bit ahead of the SEA–SFO route.

DL 2635 arrived on time 75% of the time, versus 70% across the SEA–SFO route.

A bit behind the Delta Air Lines network.

DL 2635 arrived on time 75% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon75%(52 flights)
  • Tue78%(49 flights)
  • Wed71%(48 flights)
  • Thu78%(49 flights)
  • Fri82%(49 flights)
  • Sat82%(50 flights)
  • Sun61%(51 flights)
On-time by departure window
  • 3–6 PM56%(16 flights)
  • 6–9 PM75%(64 flights)
  • 9 PM–12 AM76%(268 flights)
On-time trend by month
68%
May

Jun 73% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202577%31
August 202577%31
September 202591%23
October 202573%30
November 202559%29
December 202578%27
January 202676%29
February 202671%28
March 202679%29
April 202680%30
May 202668%31
Departures on time
77%
Diverted
0%
Flights flown
348
Months covered
12

Same route, other flights

Keep nerding

Based on 352 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.