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Flight Reliability

DL 739 · Delta Air Lines

Seattle → Austin (SEA–AUS)83% of its flights flew this route. The rest (SNA–MSP, ATL–PNS) are included in these numbers.

86
Pretty Reliable
WanderNerd Reliability Score
86%
Arrive within 15 minutes
0 min
Average arrival delay
1.5%
Cancelled
10 min early
Median arrival delay

Based on 337 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

DL 739 departing between 3–6 PM arrived on time 91% of the time, versus 70% between 12–3 PM.

Friday is doing you no favors.

DL 739 arrived on time 93% of the time on Tuesdays. On Fridays: 79%.

A bit ahead of the SEA–AUS route.

DL 739 arrived on time 86% of the time, versus 79% across the SEA–AUS route.

A bit ahead of the Delta Air Lines network.

DL 739 arrived on time 86% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon91%(54 flights)
  • Tue93%(45 flights)
  • Wed90%(41 flights)
  • Thu82%(50 flights)
  • Fri79%(52 flights)
  • Sat83%(40 flights)
  • Sun82%(49 flights)
On-time by departure window
  • 6–9 AM88%(274 flights)
  • 9 AM–12 PM—(3 flights)
  • 12–3 PM70%(43 flights)
  • 3–6 PM91%(11 flights)
On-time trend by month
87%
May

Jun 77% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%30
July 202587%30
August 202597%30
September 202597%30
October 202590%29
November 202590%29
December 202586%35
January 202670%20
February 202679%14
March 202680%25
April 202679%28
May 202687%31
Departures on time
88%
Diverted
0.3%
Flights flown
331
Months covered
12

Same route, other flights

Keep nerding

Based on 337 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.