GRR to DEN flight delays
Grand Rapids, MI (GRR) Denver, CO (DEN) · 1,015 miles
1,238 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
78.42%
Arrived on time
Within 15 minutes of schedule
0.4%
Cancelled
Share of scheduled flights
72 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
The season swings this route hard. In October it ran 32.8 points more punctual than in January — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The shape of the lateness matters here. Flights on this route are not late often, but when they are late they are late by about 72 minutes — long enough to lose a connection or an evening. The on-time percentage looks reassuring and understates the consequence of being on the wrong flight.
The route has been getting worse. The later months run 9.9 points less punctual than the earlier ones. A drift of that size is rarely weather; it is more often an airline adding frequencies faster than the airports can absorb them.
The 3 airlines here are separated by under 6 points — close enough to call a tie. Choose on price and departure time.
Which airline should you fly on this route?
Over January 2025 – August 2026, United Airlines arrived on time most often on GRR to DEN. Frontier Airlines was late most often. Flights ran closest to schedule in October and worst in January.
Every airline on GRR 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 |
|---|---|---|---|---|---|
| United Airlines | 728 | 79.72% | 0.55% | 76 min | C |
| Southwest Airlines | 363 | 77.35% | 0.28% | 53 min | C |
| Frontier Airlines | 146 | 74.48% | 0% | 96 min | C |
| SkyWest Airlines | 1 | 100% | 0% | — | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
DEN to GRR Denver back to Grand Rapids 75.26% on time COther routes from Grand Rapids
Common questions
Are flights from Grand Rapids to Denver usually delayed?
78.42% of flights on the GRR 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 Grand Rapids to Denver?
United Airlines, at 79.72% on time across 728 flights. The least punctual on the route was Frontier Airlines at 74.48%.
How often are GRR to DEN flights cancelled?
0.4% of scheduled flights did not operate — about 4 in every thousand. That is in the normal range.
What is the best month to fly Grand Rapids to Denver?
October, when 90.1% of flights arrived on time. The worst was January at 57.3%.
When GRR to DEN flights are late, how late are they?
About 72 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 GRR to DEN during January 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 →