Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 1278 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1278 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

79%
Arrive within 15 minutes
8 min
Average arrival delay
1.1%
Cancelled
6 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(51 flights)
  • Tue83%(54 flights)
  • Wed91%(54 flights)
  • Thu81%(52 flights)
  • Fri75%(51 flights)
  • Sat67%(48 flights)
  • Sun72%(46 flights)
On-time by departure window
  • 6–9 AM64%(11 flights)
  • 9 AM–12 PM—(6 flights)
  • 3–6 PM81%(182 flights)
  • 6–9 PM76%(157 flights)
On-time trend by month
82%
May

Jun 71% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%14
August 202564%25
September 2025100%26
October 202585%27
November 202575%24
December 202565%17
January 202680%44
February 202674%35
March 202657%28
April 202689%46
May 202682%62
Departures on time
77%
Diverted
0.8%
Flights flown
356
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.