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Flight Reliability

DL 533 · Delta Air Lines

Seattle → Detroit (SEA–DTW)91% of its flights flew this route. The rest (ATL–PHL, PHL–ATL) are included in these numbers.

87
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
1 min early
Average arrival delay
0.9%
Cancelled
9 min early
Median arrival delay

Based on 346 historical flights. Data through May 2026.

What the data says

3–6 PM has a slight edge.

Departures between 3–6 PM arrived on time 88% of the time, against 81% between 12–3 PM.

Sunday scaries are real for this one.

DL 533 arrived on time 90% of the time on Wednesdays. On Sundays: 79%.

A bit ahead of the Delta Air Lines network.

DL 533 arrived on time 85% of the time, versus 81% across the Delta Air Lines network.

Ticking up lately.

DL 533 arrived on time 89% of the time over the last three months in the data, compared with 82% in the three months before that.

The breakdown

On-time by weekday
  • Mon88%(50 flights)
  • Tue84%(50 flights)
  • Wed90%(50 flights)
  • Thu85%(52 flights)
  • Fri88%(51 flights)
  • Sat83%(36 flights)
  • Sun79%(52 flights)
On-time by departure window
  • 12–3 PM81%(123 flights)
  • 3–6 PM88%(218 flights)
On-time trend by month
100%
May

Jun 82% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%27
July 202584%31
August 202577%26
September 202575%20
October 202594%31
November 2025100%29
December 202586%43
January 202674%34
February 202688%24
March 202678%27
April 202688%25
May 2026100%24
Departures on time
84%
Diverted
0.6%
Flights flown
341
Months covered
12

Same route, other flights

Keep nerding

Based on 346 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.