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Flight Reliability

DL 1626 · Delta Air Lines

St. Louis → Detroit (STL–DTW)96% of its flights flew this route. The rest (JFK–BOS) are included in these numbers.

94
Nerd Approved
WanderNerd Reliability Score
93%
Arrive within 15 minutes
6 min early
Average arrival delay
1.9%
Cancelled
16 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

DL 1626 departing between 6–9 AM arrived on time 94% of the time, versus 79% between 12–3 PM.

Monday is the weak spot.

DL 1626 arrived on time 98% of the time on Thursdays. On Mondays: 88%.

Better than the STL–DTW route average.

DL 1626 arrived on time 93% of the time, versus 83% across the STL–DTW route.

Better than the Delta Air Lines network average.

DL 1626 arrived on time 93% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon88%(48 flights)
  • Tue96%(51 flights)
  • Wed96%(52 flights)
  • Thu98%(52 flights)
  • Fri94%(49 flights)
  • Sat90%(52 flights)
  • Sun90%(52 flights)
On-time by departure window
  • 6–9 AM94%(340 flights)
  • 12–3 PM79%(14 flights)
  • 3–6 PM—(2 flights)
On-time trend by month
94%
May

Jun 100% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 202597%30
August 202597%31
September 2025100%29
October 202587%31
November 202589%28
December 202586%29
January 202690%31
February 202689%28
March 202696%28
April 202693%30
May 202694%31
Departures on time
93%
Diverted
0%
Flights flown
356
Months covered
12

Same route, other flights

Keep nerding

Based on 363 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.