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Flight Reliability

DL 4088 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 4088 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

81%
Arrive within 15 minutes
11 min
Average arrival delay
1.2%
Cancelled
7 min early
Median arrival delay

Based on 518 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(76 flights)
  • Tue76%(80 flights)
  • Wed77%(79 flights)
  • Thu82%(78 flights)
  • Fri81%(74 flights)
  • Sat82%(44 flights)
  • Sun88%(80 flights)
On-time by departure window
  • 6–9 AM92%(166 flights)
  • 3–6 PM74%(330 flights)
  • 6–9 PM100%(15 flights)
On-time trend by month
94%
May

Jun 66% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202566%47
July 202575%52
August 202581%52
September 202590%52
October 202590%58
November 202578%54
December 202550%48
January 202682%28
February 2026100%28
March 202690%31
April 202690%30
May 202694%31
Departures on time
83%
Diverted
0.2%
Flights flown
511
Months covered
12

Keep nerding

Based on 518 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.