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Flight Reliability

DL 4230 · Delta Air Lines

GJT → Salt Lake City (GJT–SLC)

100
Nerd Approved
WanderNerd Reliability Score
97%
Arrive within 15 minutes
12 min early
Average arrival delay
0%
Cancelled
17 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

DL 4230 arrived on time 100% of the time on Wednesdays. On Fridays: 92%.

Well ahead of the Delta Air Lines network.

DL 4230 arrived on time 97% of the time, versus 81% across the Delta Air Lines network.

It basically never cancels.

Out of 365 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon92%(52 flights)
  • Tue98%(52 flights)
  • Wed100%(52 flights)
  • Thu98%(52 flights)
  • Fri92%(52 flights)
  • Sat100%(52 flights)
  • Sun100%(53 flights)
On-time by departure window
  • 3–6 AM98%(145 flights)
  • 6–9 AM97%(219 flights)
  • 9 AM–12 PM—(1 flights)
On-time trend by month
100%
May

Jun 97% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 202597%31
August 202597%31
September 2025100%30
October 2025100%31
November 202597%30
December 202597%31
January 202697%31
February 202696%28
March 2026100%31
April 202690%30
May 2026100%31
Departures on time
98%
Diverted
0%
Flights flown
365
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.