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Flight Reliability

DL 1233 · Delta Air Lines

New York → Austin (JFK–AUS)

71
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
3 min
Average arrival delay
2.5%
Cancelled
10 min early
Median arrival delay

Based on 364 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 1233 departing between 3–6 PM arrived on time 83% of the time, versus 69% between 6–9 PM.

Sunday scaries are real for this one.

DL 1233 arrived on time 82% of the time on Tuesdays and just 66% on Sundays. That gap is worth planning around.

Lagging the JFK–AUS route.

DL 1233 arrived on time 74% of the time, versus 82% across the JFK–AUS route.

Lagging the Delta Air Lines network.

DL 1233 arrived on time 74% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon74%(50 flights)
  • Tue82%(51 flights)
  • Wed67%(51 flights)
  • Thu69%(51 flights)
  • Fri80%(50 flights)
  • Sat80%(51 flights)
  • Sun66%(50 flights)
On-time by departure window
  • 3–6 PM83%(127 flights)
  • 6–9 PM69%(227 flights)
On-time trend by month
70%
May

Jun 53% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202553%30
July 202565%31
August 202573%30
September 202577%30
October 202567%30
November 202566%29
December 202579%29
January 202679%28
February 202677%26
March 202687%31
April 202697%30
May 202670%30
Departures on time
79%
Diverted
0.3%
Flights flown
354
Months covered
12

Same route, other flights

Keep nerding

Based on 364 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.