OnTimeStats

Historical on-time performance

Denver to Salt Lake City

391 miData through May 2026Source: US DOT · BTS

Flights on DEN–SLC arrive on time 77% of the time over the last 12 months.

On-time rate77%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights

based on 7,765 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

Too close to call — no single carrier is clearly more on-time here.

  • Delta Air Lines
    On-time81%
    Medianon time
    p9035 min
    Cancel0.4%
    Flights1,689
  • Frontier Airlines
    On-time80%
    Medianon time
    p9035 min
    Cancel0.5%
    Flights995
  • SkyWest Airlines
    On-time79%
    Medianon time
    p9050 min
    Cancel0.9%
    Flights1,381
  • United Airlines
    On-time77%
    Medianon time
    p9040 min
    Cancel0.2%
    Flights1,353
  • Southwest Airlines
    On-time71%
    Medianon time
    p9050 min
    Cancel0.5%
    Flights2,347

Why flights run late

Delay causes

  • Airline37%
  • Weather3%
  • Air traffic (NAS)14%
  • Late aircraft46%
  • Security0%

Most delay minutes here are attributed to Late aircraft.

When flights don't go

Why flights were cancelled

  • Airline32%
  • Weather38%
  • Air traffic (NAS)30%
  • Security0%

Most cancellations here are attributed to Weather. Shares are among 37 cancellations with a reported cause (BTS reports causes from June 2003).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly DEN → SLC

All airlines · rolling 36 months (2023-06 .. 2026-05).

Best time of day

Mornings are the most reliable time of day to fly this route — 89% on time.

  • Mornings89% on time · p90 15 min · 5,881 flights
  • Middays80% on time · p90 30 min · 5,648 flights
  • Afternoons75% on time · p90 45 min · 3,905 flights
  • Evenings68% on time · p90 70 min · 4,566 flights
  • Overnights67% on time · p90 70 min · 3,644 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 74% to 80% on time.

  • Tuesdays80% on time · p90 35 min · 3,318 flights
  • Wednesdays79% on time · p90 35 min · 3,358 flights
  • Saturdays78% on time · p90 40 min · 2,899 flights
  • Thursdays77% on time · p90 40 min · 3,546 flights
  • Mondays76% on time · p90 45 min · 3,573 flights
  • Sundays75% on time · p90 50 min · 3,361 flights
  • Fridays74% on time · p90 50 min · 3,591 flights

Keep exploring

Related pages

Delay predictorfor this route→DEN airportDenver→SLC airportSalt Lake City→Southwest Airlinesairline profile→Delta Air Linesairline profile→SkyWest Airlinesairline profile→Seasonal delay patternsguide→

Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.