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Flight Reliability

DL 1903 · Delta Air Lines

Detroit → Fort Lauderdale (DTW–FLL)83% of its flights flew this route. The rest (FLL–BOS, FLL–DTW) are included in these numbers.

75
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
13 min
Average arrival delay
0.4%
Cancelled
0 min
Median arrival delay

Based on 233 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

DL 1903 departing between 6–9 AM arrived on time 96% of the time, versus 33% between 6–9 PM.

Sunday scaries are real for this one.

DL 1903 arrived on time 88% of the time on Tuesdays and just 50% on Sundays. That gap is worth planning around.

Lagging the Delta Air Lines network.

DL 1903 arrived on time 72% of the time, versus 81% across the Delta Air Lines network.

Slipping a little lately.

DL 1903 arrived on time 78% of the time over the last three months in the data, compared with 84% in the three months before that.

The breakdown

On-time by weekday
  • Mon75%(36 flights)
  • Tue88%(32 flights)
  • Wed85%(27 flights)
  • Thu55%(29 flights)
  • Fri76%(33 flights)
  • Sat76%(38 flights)
  • Sun50%(36 flights)
On-time by departure window
  • 12–3 AM—(2 flights)
  • 6–9 AM96%(26 flights)
  • 3–6 PM71%(191 flights)
  • 6–9 PM33%(12 flights)
On-time trend by month
95%
Apr

Jun 37% → Apr 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202537%30
July 202569%29
August 202584%31
September 202588%25
October 202581%21
November 202583%24
December 202557%37
April 202695%20
Departures on time
75%
Diverted
0.4%
Flights flown
231
Months covered
10

Same route, other flights

Keep nerding

Based on 233 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.