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Flight Reliability

F9 3974 · Frontier Airlines

Seattle → Phoenix (SEA–PHX)

41
Bring Snacks
WanderNerd Reliability Score
64%
Arrive within 15 minutes
37 min
Average arrival delay
4.4%
Cancelled
1 min
Median arrival delay

Based on 91 historical flights. Data through May 2026.

What the data says

12–3 PM has a slight edge.

Departures between 12–3 PM arrived on time 64% of the time, against 60% between 6–9 PM.

Mondays have been rough.

F9 3974 arrived on time 86% of the time on Saturdays and just 50% on Mondays. That gap is worth planning around.

Well behind the SEA–PHX route.

F9 3974 arrived on time 64% of the time, versus 80% across the SEA–PHX route.

Lagging the Frontier Airlines network.

F9 3974 arrived on time 64% of the time, versus 73% across the Frontier Airlines network.

The breakdown

On-time by weekday
  • Mon50%(22 flights)
  • Tue—(0 flights)
  • Wed—(9 flights)
  • Thu80%(10 flights)
  • Fri58%(24 flights)
  • Sat86%(14 flights)
  • Sun—(8 flights)
On-time by departure window
  • 12–3 PM64%(39 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM60%(42 flights)
  • 9 PM–12 AM—(5 flights)
On-time trend by month
55%
Nov

Jun 64% → Nov 55% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%11
July 202565%17
August 202556%18
September 202593%15
November 202555%11
Departures on time
69%
Diverted
0%
Flights flown
87
Months covered
9

Same route, other flights

Keep nerding

Based on 91 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.