Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 904 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 904 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

89%
Arrive within 15 minutes
4 min early
Average arrival delay
2.2%
Cancelled
10 min early
Median arrival delay

Based on 729 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon90%(98 flights)
  • Tue84%(102 flights)
  • Wed94%(103 flights)
  • Thu93%(103 flights)
  • Fri90%(103 flights)
  • Sat89%(99 flights)
  • Sun84%(100 flights)
On-time by departure window
  • 6–9 AM—(4 flights)
  • 9 AM–12 PM89%(353 flights)
  • 12–3 PM90%(351 flights)
On-time trend by month
92%
May

Jun 85% → May 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202585%58
July 202590%61
August 202580%61
September 202597%59
October 202592%62
November 202588%57
December 202584%57
January 202695%59
February 202688%56
March 202686%58
April 202695%58
May 202692%62
Departures on time
90%
Diverted
0.7%
Flights flown
708
Months covered
12

Keep nerding

Based on 729 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.