Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 3903 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 3903 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

92%
Arrive within 15 minutes
6 min early
Average arrival delay
0%
Cancelled
11 min early
Median arrival delay

Based on 689 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon86%(102 flights)
  • Tue94%(104 flights)
  • Wed92%(99 flights)
  • Thu93%(98 flights)
  • Fri92%(102 flights)
  • Sat93%(84 flights)
  • Sun91%(99 flights)
On-time by departure window
  • 3–6 PM92%(687 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
95%
May

Jun 83% → May 95% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%60
July 202597%60
August 202592%62
September 202592%60
October 202597%62
November 202591%58
December 202596%56
January 202696%45
February 202691%43
March 202682%60
April 202688%60
May 202695%62
Departures on time
91%
Diverted
0.1%
Flights flown
688
Months covered
12

Keep nerding

Based on 689 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.