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Flight Reliability

DL 1633 · Delta Air Lines

Detroit → Houston (DTW–IAH)

79
Usually Fine
WanderNerd Reliability Score
79%
Arrive within 15 minutes
4 min
Average arrival delay
1.7%
Cancelled
5 min early
Median arrival delay

Based on 362 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

DL 1633 departing between 9 PM–12 AM arrived on time 96% of the time, versus 75% between 6–9 PM.

Thursday is the weak spot.

DL 1633 arrived on time 84% of the time on Wednesdays. On Thursdays: 73%.

Ticking up lately.

DL 1633 arrived on time 81% of the time over the last three months in the data, compared with 78% in the three months before that.

The breakdown

On-time by weekday
  • Mon77%(52 flights)
  • Tue80%(51 flights)
  • Wed84%(51 flights)
  • Thu73%(51 flights)
  • Fri76%(50 flights)
  • Sat78%(50 flights)
  • Sun82%(50 flights)
On-time by departure window
  • 12–3 PM91%(53 flights)
  • 3–6 PM—(8 flights)
  • 6–9 PM75%(271 flights)
  • 9 PM–12 AM96%(23 flights)
On-time trend by month
77%
May

Jun 58% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202558%26
July 202558%31
August 202590%30
September 202590%30
October 202597%31
November 202571%28
December 202565%31
January 202677%30
February 202693%27
March 202683%30
April 202683%30
May 202677%31
Departures on time
76%
Diverted
0.3%
Flights flown
355
Months covered
12

Same route, other flights

Keep nerding

Based on 362 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.