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Flight Reliability

DL 1259 · Delta Air Lines

Tulsa → Atlanta (TUL–ATL)92% of its flights flew this route. The rest (LGA–TPA, TPA–LGA) are included in these numbers.

84
Pretty Reliable
WanderNerd Reliability Score
89%
Arrive within 15 minutes
1 min
Average arrival delay
2.9%
Cancelled
14 min early
Median arrival delay

Based on 381 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

DL 1259 departing between 3–6 AM arrived on time 92% of the time, versus 56% between 3–6 PM.

Saturdays have been rough.

DL 1259 arrived on time 94% of the time on Fridays and just 73% on Saturdays. That gap is worth planning around.

Better than the Delta Air Lines network average.

DL 1259 arrived on time 89% of the time, versus 81% across the Delta Air Lines network.

Trending in the right direction.

DL 1259 arrived on time 93% of the time over the last three months in the data, compared with 84% in the three months before that.

The breakdown

On-time by weekday
  • Mon92%(52 flights)
  • Tue90%(52 flights)
  • Wed93%(54 flights)
  • Thu93%(54 flights)
  • Fri94%(52 flights)
  • Sat73%(51 flights)
  • Sun89%(53 flights)
On-time by departure window
  • 3–6 AM92%(133 flights)
  • 6–9 AM91%(203 flights)
  • 9 AM–12 PM75%(16 flights)
  • 3–6 PM56%(16 flights)
On-time trend by month
90%
May

Jun 83% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202587%30
August 202597%30
September 202593%30
October 202594%31
November 202593%28
December 202566%41
January 202691%32
February 202696%28
March 202693%29
April 202697%30
May 202690%29
Departures on time
91%
Diverted
0.5%
Flights flown
368
Months covered
12

Same route, other flights

Keep nerding

Based on 381 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.