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Flight Reliability

DL 4903 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4903 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

75%
Arrive within 15 minutes
10 min
Average arrival delay
5.2%
Cancelled
8 min early
Median arrival delay

Based on 425 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon71%(58 flights)
  • Tue75%(65 flights)
  • Wed79%(63 flights)
  • Thu72%(65 flights)
  • Fri75%(64 flights)
  • Sat81%(37 flights)
  • Sun76%(50 flights)
On-time by departure window
  • 6–9 AM84%(147 flights)
  • 9 AM–12 PM75%(85 flights)
  • 12–3 PM85%(58 flights)
  • 3–6 PM63%(24 flights)
  • 6–9 PM58%(88 flights)
On-time trend by month
70%
May

Jun 96% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202596%23
July 202587%30
August 202574%31
September 202563%27
October 202568%28
November 202562%26
December 202561%41
January 202680%45
February 202687%38
March 202673%45
April 202684%38
May 202670%30
Departures on time
79%
Diverted
0.2%
Flights flown
402
Months covered
12

Keep nerding

Based on 425 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.