OnTimeStats

Historical on-time performance

Salt Lake City to Denver

391 miData through May 2026Source: US DOT · BTS

Flights on SLC–DEN arrive on time 76% of the time over the last 12 months.

On-time rate76%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights

based on 7,763 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

  • SkyWest Airlinesbest
    On-time84%
    Medianon time
    p9025 min
    Cancel0.7%
    Flights1,377
  • Delta Air Lines
    On-time77%
    Medianon time
    p9045 min
    Cancel0.2%
    Flights1,690
  • Frontier Airlines
    On-time76%
    Medianon time
    p9045 min
    Cancel0.8%
    Flights996
  • United Airlines
    On-time75%
    Medianon time
    p9040 min
    Cancel0.5%
    Flights1,354
  • Southwest Airlines
    On-time71%
    Medianon time
    p9045 min
    Cancel0.7%
    Flights2,346

Why flights run late

Delay causes

  • Airline32%
  • Weather2%
  • Air traffic (NAS)37%
  • Late aircraft29%
  • Security0%

Most delay minutes here are attributed to Air traffic (NAS).

When flights don't go

Why flights were cancelled

  • Airline36%
  • Weather30%
  • Air traffic (NAS)34%
  • Security0%

Most cancellations here are attributed to Airline. Shares are among 44 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 SLC → DEN

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 — 83% on time.

  • Mornings83% on time · p90 25 min · 7,675 flights
  • Middays81% on time · p90 30 min · 6,142 flights
  • Overnights73% on time · p90 50 min · 2,143 flights
  • Evenings69% on time · p90 65 min · 4,050 flights
  • Afternoons66% on time · p90 65 min · 3,606 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 73% to 79% on time.

  • Tuesdays79% on time · p90 40 min · 3,304 flights
  • Wednesdays78% on time · p90 35 min · 3,361 flights
  • Saturdays78% on time · p90 40 min · 2,839 flights
  • Sundays77% on time · p90 40 min · 3,411 flights
  • Mondays77% on time · p90 40 min · 3,565 flights
  • Thursdays76% on time · p90 45 min · 3,546 flights
  • Fridays73% on time · p90 50 min · 3,590 flights

Keep exploring

Related pages

Delay predictorfor this route→SLC airportSalt Lake City→DEN airportDenver→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.