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Flight Reliability

DL 4234 · Delta Air Lines

Salt Lake City → GJT (SLC–GJT)

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

Based on 365 historical flights. Data through May 2026.

What the data says

3–6 PM has a slight edge.

Departures between 3–6 PM arrived on time 100% of the time, against 97% between 9 PM–12 AM.

Friday is doing you no favors.

DL 4234 arrived on time 100% of the time on Thursdays. On Fridays: 92%.

Well ahead of the Delta Air Lines network.

DL 4234 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
  • Mon96%(52 flights)
  • Tue96%(51 flights)
  • Wed98%(52 flights)
  • Thu100%(52 flights)
  • Fri92%(51 flights)
  • Sat100%(52 flights)
  • Sun98%(53 flights)
On-time by departure window
  • 12–3 PM—(3 flights)
  • 3–6 PM100%(10 flights)
  • 6–9 PM98%(140 flights)
  • 9 PM–12 AM97%(210 flights)
On-time trend by month
97%
May

Jun 93% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202594%31
August 202597%31
September 202597%30
October 202597%30
November 2025100%30
December 2025100%31
January 202693%30
February 2026100%28
March 2026100%31
April 2026100%30
May 202697%31
Departures on time
96%
Diverted
0.5%
Flights flown
363
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.