Grand Rapids (GRR) to Denver (DEN): On-Time Performance
Data through July 2026
Grand Rapids (GRR) to Denver (DEN) effectively runs on two schedules. In October 2024, 92% of arrivals were on time; in January 2026 that fell to 57% — a 34-point seasonal swing. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 70%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 0.3%
- Flights/day
- 3.4
- last 12 months
- Duration
- 2h 57m
- scheduled
- Distance
- 1,015 mi
Best airline from GRR to DEN
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 81% | 15 min | 0.4% | 1,518 |
| Southwest Airlines | 77% | 13 min | 0.1% | 800 |
| Frontier Airlines | 75% | 19 min | 0.6% | 311 |
Monthly on-time trend
Best time to fly from GRR to DEN
Aim for departures around 6 a.m. (92% on-time); avoid 5 p.m. departures (60%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 15 min |
| Tuesday | 80% | 11 min |
| Wednesday | 77% | 15 min |
| Thursday | 79% | 18 min |
| Friday | 78% | 17 min |
| Saturdaybest | 81% | 11 min |
| Sunday | 80% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft32%
- Airline operations32%
- National airspace system31%
- Weather5%
Frequently asked questions
- How often are flights from GRR to DEN delayed?
- 21% of GRR–DEN flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from GRR to DEN?
- United Airlines has the best on-time record on this route at 81%, based on 1,518 flights. 3 airlines flew GRR–DEN frequently enough to compare in this period.
- What is the best time of day to fly from GRR to DEN?
- Departures around 6 a.m. have the best record (92% on-time), while departures around 5 p.m. have the worst (60%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from GRR to DEN?
- The scheduled GRR–DEN flight time averages 2h 57m over 1,015 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are GRR to DEN flights cancelled?
- 0.3% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from GRR to DEN?
- January 2026 was the roughest month in this dataset, with only 57% of arrivals on time. The best was October 2024 at 92%. If your dates are flexible, that 34-point gap is worth planning around.
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Based on 2,630 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.