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Flight Reliability

DL 3633 · Delta Air Lines

GTF → Salt Lake City (GTF–SLC)80% of its flights flew this route. The rest (OAJ–ATL, MSP–ORD) are included in these numbers.

94
Nerd Approved
WanderNerd Reliability Score
88%
Arrive within 15 minutes
2 min
Average arrival delay
0.4%
Cancelled
14 min early
Median arrival delay

Based on 243 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

DL 3633 departing between 3–6 AM arrived on time 95% of the time, versus 25% between 6–9 PM.

Friday is doing you no favors.

DL 3633 arrived on time 100% of the time on Wednesdays and just 78% on Fridays. That gap is worth planning around.

A bit behind the GTF–SLC route.

DL 3633 arrived on time 88% of the time, versus 93% across the GTF–SLC route.

A bit ahead of the Delta Air Lines network.

DL 3633 arrived on time 88% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon91%(34 flights)
  • Tue80%(35 flights)
  • Wed100%(31 flights)
  • Thu100%(32 flights)
  • Fri78%(36 flights)
  • Sat89%(37 flights)
  • Sun78%(37 flights)
On-time by departure window
  • 3–6 AM95%(218 flights)
  • 3–6 PM25%(12 flights)
  • 6–9 PM25%(12 flights)
On-time trend by month
69%
Feb

Jun 100% → Feb 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%23
July 2025100%31
August 202590%31
September 2025100%30
October 202594%31
November 202593%30
December 202568%37
February 202669%16
Departures on time
90%
Diverted
0%
Flights flown
242
Months covered
10

Same route, other flights

Keep nerding

Based on 243 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.