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Flight Reliability

DL 4041 · Delta Air Lines

San Jose → Seattle (SJC–SEA)90% of its flights flew this route. The rest (DTW–MSN, MSN–DTW) are included in these numbers.

95
Nerd Approved
WanderNerd Reliability Score
90%
Arrive within 15 minutes
8 min early
Average arrival delay
0.5%
Cancelled
17 min early
Median arrival delay

Based on 381 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

DL 4041 departing between 6–9 AM arrived on time 92% of the time, versus 53% between 9 AM–12 PM.

Sunday scaries are real for this one.

DL 4041 arrived on time 93% of the time on Saturdays. On Sundays: 86%.

A bit ahead of the SJC–SEA route.

DL 4041 arrived on time 90% of the time, versus 84% across the SJC–SEA route.

Better than the Delta Air Lines network average.

DL 4041 arrived on time 90% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon93%(54 flights)
  • Tue89%(54 flights)
  • Wed89%(53 flights)
  • Thu91%(54 flights)
  • Fri89%(52 flights)
  • Sat93%(55 flights)
  • Sun86%(56 flights)
On-time by departure window
  • 6–9 AM92%(356 flights)
  • 9 AM–12 PM53%(15 flights)
  • 12–3 PM—(2 flights)
  • 3–6 PM—(5 flights)
On-time trend by month
84%
May

Jun 77% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%30
July 202597%31
August 202594%31
September 202593%30
October 2025100%31
November 202597%30
December 202583%40
January 202674%35
February 2026100%28
March 202687%31
April 202697%30
May 202684%31
Departures on time
92%
Diverted
0.3%
Flights flown
378
Months covered
12

Same route, other flights

Keep nerding

Based on 381 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.