Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 1189 · Delta Air Lines

Salt Lake City → Santa Ana (SLC–SNA)89% of its flights flew this route. The rest (SNA–SLC) are included in these numbers.

86
Pretty Reliable
WanderNerd Reliability Score
79%
Arrive within 15 minutes
4 min
Average arrival delay
0.3%
Cancelled
7 min early
Median arrival delay

Based on 397 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

DL 1189 departing between 12–3 PM arrived on time 89% of the time, versus 78% between 9 AM–12 PM.

Mondays have been rough.

DL 1189 arrived on time 92% of the time on Wednesdays and just 70% on Mondays. That gap is worth planning around.

A bit behind the SLC–SNA route.

DL 1189 arrived on time 79% of the time, versus 84% across the SLC–SNA route.

It basically never cancels.

Out of 397 scheduled flights, only 0.3% were cancelled.

The breakdown

On-time by weekday
  • Mon70%(54 flights)
  • Tue86%(58 flights)
  • Wed92%(59 flights)
  • Thu76%(54 flights)
  • Fri82%(55 flights)
  • Sat74%(61 flights)
  • Sun73%(55 flights)
On-time by departure window
  • 9 AM–12 PM78%(351 flights)
  • 12–3 PM89%(45 flights)
On-time trend by month
90%
May

Jun 81% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202581%36
July 202582%27
August 202573%26
September 202569%29
October 202555%31
November 202583%29
December 202586%43
January 202674%39
February 202676%29
March 202685%41
April 202689%35
May 202690%31
Departures on time
85%
Diverted
0%
Flights flown
396
Months covered
12

Same route, other flights

Keep nerding

Based on 397 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.