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Flight Reliability

DL 734 · Delta Air Lines

Detroit → Seattle (DTW–SEA)

80
Pretty Reliable
WanderNerd Reliability Score
79%
Arrive within 15 minutes
2 min
Average arrival delay
1.4%
Cancelled
4 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

DL 734 departing between 6–9 AM arrived on time 81% of the time, versus 64% between 9 AM–12 PM.

Skip Tuesday if you can.

DL 734 arrived on time 85% of the time on Thursdays. On Tuesdays: 73%.

A bit ahead of the DTW–SEA route.

DL 734 arrived on time 79% of the time, versus 74% across the DTW–SEA route.

Trending in the right direction.

DL 734 arrived on time 73% of the time over the last three months in the data, compared with 63% in the three months before that.

The breakdown

On-time by weekday
  • Mon80%(49 flights)
  • Tue73%(52 flights)
  • Wed83%(52 flights)
  • Thu85%(52 flights)
  • Fri80%(49 flights)
  • Sat77%(51 flights)
  • Sun79%(53 flights)
On-time by departure window
  • 6–9 AM81%(333 flights)
  • 9 AM–12 PM64%(25 flights)
On-time trend by month
65%
May

Jun 90% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202597%31
August 202590%31
September 202593%30
October 202587%31
November 202583%30
December 202545%29
January 202663%30
February 202681%26
March 202666%29
April 202690%30
May 202665%31
Departures on time
89%
Diverted
0.5%
Flights flown
358
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.