SLC to DEN flight delays
Salt Lake City, UT (SLC) Denver, CO (DEN) · 391 miles
658 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
78.63%
Arrived on time
Within 15 minutes of schedule
0.15%
Cancelled
Share of scheduled flights
70 min
When late, late by
Average across delayed arrivals
16 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. SkyWest Airlines arrived on time 17.9 points more often than Southwest Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The two directions do not behave alike. DEN to SLC arrives on time 9.9 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
The Salt Lake City to Denver route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over March 2025 – August 2026, SkyWest Airlines arrived on time most often on SLC to DEN. Southwest Airlines was late most often.
Every airline on SLC to DEN
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 191 | 69.47% | 0% | 55 min | C |
| Delta Air Lines | 144 | 81.25% | 0% | 67 min | B |
| United Airlines | 116 | 84.35% | 0% | 86 min | B |
| SkyWest Airlines | 111 | 87.39% | 0% | 41 min | A |
| Frontier Airlines | 96 | 75.79% | 1.04% | 114 min | — |
The return leg
DEN to SLC Denver back to Salt Lake City 68.75% on time DOther routes from Salt Lake City
Common questions
Are flights from Salt Lake City to Denver usually delayed?
78.63% of flights on the SLC to DEN route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from Salt Lake City to Denver?
SkyWest Airlines, at 87.39% on time across 111 flights. The least punctual on the route was Southwest Airlines at 69.47%.
How often are SLC to DEN flights cancelled?
0.15% of scheduled flights did not operate — about 2 in every thousand. That is in the normal range.
When SLC to DEN flights are late, how late are they?
About 70 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SLC to DEN during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →