Skip to content
WanderNerd
Check a flight

Flight Reliability

F9 1439 · Frontier Airlines

Salt Lake City → Phoenix (SLC–PHX)

69
Usually Fine
WanderNerd Reliability Score
70%
Arrive within 15 minutes
14 min
Average arrival delay
1.8%
Cancelled
9 min early
Median arrival delay

Based on 169 historical flights. Data through May 2026.

What the data says

Skip Monday if you can.

F9 1439 arrived on time 75% of the time on Sundays. On Mondays: 64%.

Lagging the SLC–PHX route.

F9 1439 arrived on time 70% of the time, versus 85% across the SLC–PHX route.

A bit behind the Frontier Airlines network.

F9 1439 arrived on time 70% of the time, versus 73% across the Frontier Airlines network.

Ticking up lately.

F9 1439 arrived on time 87% of the time over the last three months in the data, compared with 83% in the three months before that.

The breakdown

On-time by weekday
  • Mon64%(39 flights)
  • Tue—(4 flights)
  • Wed71%(17 flights)
  • Thu73%(22 flights)
  • Fri65%(37 flights)
  • Sat74%(19 flights)
  • Sun75%(28 flights)
On-time by departure window
  • 3–6 PM71%(24 flights)
  • 6–9 PM69%(74 flights)
  • 9 PM–12 AM71%(68 flights)
On-time trend by month
67%
Apr

Jun 36% → Apr 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202536%14
July 202548%21
August 202562%13
September 202562%13
October 202581%21
December 202594%17
January 202675%16
February 2026100%10
March 202694%17
April 202667%12
Departures on time
70%
Diverted
0%
Flights flown
166
Months covered
12

Same route, other flights

Keep nerding

Based on 169 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.