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Flight Reliability

DL 4278 · Delta Air Lines

Detroit → CIU (DTW–CIU)

49
Bring Snacks
WanderNerd Reliability Score
74%
Arrive within 15 minutes
19 min
Average arrival delay
6.3%
Cancelled
11 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 4278 departing between 3–6 PM arrived on time 79% of the time, versus 65% between 6–9 PM.

Sunday scaries are real for this one.

DL 4278 arrived on time 83% of the time on Wednesdays and just 63% on Sundays. That gap is worth planning around.

Lagging the Delta Air Lines network.

DL 4278 arrived on time 74% of the time, versus 81% across the Delta Air Lines network.

Keep a backup plan handy.

DL 4278 was cancelled 6.3% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon71%(49 flights)
  • Tue78%(50 flights)
  • Wed83%(48 flights)
  • Thu83%(48 flights)
  • Fri64%(47 flights)
  • Sat75%(47 flights)
  • Sun63%(48 flights)
On-time by departure window
  • 12–3 PM—(1 flights)
  • 3–6 PM79%(203 flights)
  • 6–9 PM65%(133 flights)
On-time trend by month
73%
May

Jun 90% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202577%30
August 202581%31
September 202580%30
October 202587%31
November 202575%28
December 202575%28
January 202654%26
February 202646%24
March 202665%23
April 202673%26
May 202673%30
Departures on time
75%
Diverted
0.8%
Flights flown
337
Months covered
12

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.