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Flight Reliability

DL 999 · Delta Air Lines

New York → Detroit (LGA–DTW)

62
A Little Dicey
WanderNerd Reliability Score
71%
Arrive within 15 minutes
19 min
Average arrival delay
3.0%
Cancelled
4 min early
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

Thursday is the weak spot.

DL 999 arrived on time 77% of the time on Tuesdays. On Thursdays: 62%.

Lagging the LGA–DTW route.

DL 999 arrived on time 71% of the time, versus 78% across the LGA–DTW route.

Lagging the Delta Air Lines network.

DL 999 arrived on time 71% of the time, versus 81% across the Delta Air Lines network.

Keep a backup plan handy.

DL 999 was cancelled 3.0% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon65%(49 flights)
  • Tue77%(52 flights)
  • Wed77%(51 flights)
  • Thu62%(50 flights)
  • Fri74%(50 flights)
  • Sat73%(52 flights)
  • Sun65%(49 flights)
On-time by departure window
  • 3–6 PM71%(351 flights)
  • 6–9 PM—(2 flights)
On-time trend by month
65%
May

Jun 60% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%30
July 202544%27
August 202583%30
September 202583%30
October 202577%30
November 202562%29
December 202555%29
January 202670%30
February 202692%26
March 202681%31
April 202673%30
May 202665%31
Departures on time
64%
Diverted
0%
Flights flown
353
Months covered
12

Same route, other flights

Keep nerding

Based on 364 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.