Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 331 · Delta Air Lines

Atlanta → Los Angeles (ATL–LAX)86% of its flights flew this route. The rest (STL–DTW, ATL–ICT) are included in these numbers.

62
A Little Dicey
WanderNerd Reliability Score
68%
Arrive within 15 minutes
12 min
Average arrival delay
3.0%
Cancelled
5 min early
Median arrival delay

Based on 265 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 331 departing between 3–6 PM arrived on time 79% of the time, versus 66% between 9 PM–12 AM.

Thursdays have been rough.

DL 331 arrived on time 81% of the time on Wednesdays and just 62% on Thursdays. That gap is worth planning around.

Lagging the ATL–LAX route.

DL 331 arrived on time 68% of the time, versus 79% across the ATL–LAX route.

Lagging the Delta Air Lines network.

DL 331 arrived on time 68% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon67%(48 flights)
  • Tue64%(25 flights)
  • Wed81%(21 flights)
  • Thu62%(42 flights)
  • Fri67%(45 flights)
  • Sat71%(28 flights)
  • Sun72%(47 flights)
On-time by departure window
  • 9 AM–12 PM71%(17 flights)
  • 3–6 PM79%(19 flights)
  • 6–9 PM72%(54 flights)
  • 9 PM–12 AM66%(166 flights)
On-time trend by month
77%
Apr

Jun 39% → Apr 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202539%26
July 202541%22
August 202571%24
September 202571%21
October 202563%16
December 202572%25
January 202681%31
February 202679%28
March 202683%29
April 202677%22
Departures on time
64%
Diverted
0.4%
Flights flown
256
Months covered
12

Same route, other flights

Keep nerding

Based on 265 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.