Skip to content
WanderNerd
Check a flight

Flight Reliability

DL 671 · Delta Air Lines

Salt Lake City → New York (SLC–JFK)

77
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
2 min
Average arrival delay
1.7%
Cancelled
15 min early
Median arrival delay

Based on 363 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 76% of the time, against 70% between 3–6 PM.

Thursdays have been rough.

DL 671 arrived on time 90% of the time on Fridays and just 67% on Thursdays. That gap is worth planning around.

A bit behind the SLC–JFK route.

DL 671 arrived on time 75% of the time, versus 82% across the SLC–JFK route.

A bit behind the Delta Air Lines network.

DL 671 arrived on time 75% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon71%(51 flights)
  • Tue72%(50 flights)
  • Wed75%(52 flights)
  • Thu67%(51 flights)
  • Fri90%(50 flights)
  • Sat85%(52 flights)
  • Sun69%(51 flights)
On-time by departure window
  • 12–3 PM76%(334 flights)
  • 3–6 PM70%(23 flights)
On-time trend by month
87%
May

Jun 67% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%30
July 202542%31
August 202571%31
September 202590%30
October 202577%31
November 202571%28
December 202576%29
January 202680%30
February 202685%26
March 202680%30
April 202680%30
May 202687%31
Departures on time
73%
Diverted
0%
Flights flown
357
Months covered
12

Same route, other flights

Keep nerding

Based on 363 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.