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Flight Reliability

DL 816 · Delta Air Lines

San Antonio → Boston (SAT–BOS)89% of its flights flew this route. The rest (MCO–LAX, JAC–SLC) are included in these numbers.

54
A Little Dicey
WanderNerd Reliability Score
63%
Arrive within 15 minutes
26 min
Average arrival delay
1.4%
Cancelled
6 min
Median arrival delay

Based on 360 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

DL 816 departing between 6–9 AM arrived on time 88% of the time, versus 60% between 12–3 PM.

Friday is doing you no favors.

DL 816 arrived on time 73% of the time on Saturdays and just 54% on Fridays. That gap is worth planning around.

Well behind the Delta Air Lines network.

DL 816 arrived on time 63% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon63%(49 flights)
  • Tue56%(52 flights)
  • Wed62%(52 flights)
  • Thu63%(49 flights)
  • Fri54%(48 flights)
  • Sat73%(52 flights)
  • Sun66%(50 flights)
On-time by departure window
  • 6–9 AM88%(16 flights)
  • 12–3 PM60%(309 flights)
  • 3–6 PM—(2 flights)
  • 6–9 PM80%(25 flights)
On-time trend by month
74%
May

Jun 59% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202559%29
July 202557%30
August 202575%28
September 202523%30
October 202537%30
November 202570%27
December 202574%31
January 202679%29
February 202663%27
March 202674%31
April 202666%29
May 202674%31
Departures on time
69%
Diverted
0.8%
Flights flown
352
Months covered
12

Same route, other flights

Keep nerding

Based on 360 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.