Route on-time record
DEN to GRR: most on-time flights and the best time to fly
Denver (Denver International Airport) to Grand Rapids (Gerald R. Ford International Airport). 1,243 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 0.2% were cancelled. The most reliable flight number was United 2637 at 10:04 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
DEN → GRR
Denver to Grand Rapids: 1,243 nonstop flights a year
On time (12 months)
75%
Cancelled
0.2%
avg delay 15 min
Best time to leave
9 AM to noon
84% on time vs 58% 6 to 9 PM
Most reliable airline
Frontier
83% chance on time
Lowest nonstop fare seen in the next two months: $231 (Frontier 1248 on 2026-10-25). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · United 2637
10:04 AM → 2:41 PM2h 37m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 89% of the time (273 flights, Jun 2025 to May 2026).
- Never cancelled in 273 scheduled flights.
- Leaves in this route's most on-time window (9 AM to noon: 84% on time; 6 to 9 PM: 58%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Strong track record · 273 flights
Find United 2637 fares Opens this date on Aviasales#2 · Frontier 1248
3:07 PM → 7:44 PM2h 32m nonstop
Local times, typical schedule. Last flown 2026-05-30.
86%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 86% of the time (147 flights, Jun 2025 to May 2026).
- Never cancelled in 147 scheduled flights.
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- 53% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 147 flights
Find Frontier 1248 fares Opens this date on Aviasales#3 · Southwest 1918
11:35 AM → 4:05 PM2h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 80%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 80% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's most on-time window (9 AM to noon: 84% on time; 6 to 9 PM: 58%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Limited track record · 55 flights
Find Southwest 1918 fares Opens this date on Aviasales#4 · United 2121
5:35 PM → 10:12 PM2h 37m nonstop
Local times, typical schedule. Last flown 2026-05-31.
67%
chance on time
- On time (history)
- 72%
- Cancelled
- 0.0%
- Avg arrival delay
- 17 min
- Arrived on time 72% of the time (144 flights, Jun 2025 to May 2026).
- Never cancelled in 146 scheduled flights.
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 144 flights
Find United 2121 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Frontier Airlines83%
147 flights · 86% on time as flown · 0.1% cancel
- United Airlines75%
728 flights · 75% on time as flown · 0.3% cancel
- Southwest Airlines70%
367 flights · 68% on time as flown · 0.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon84%
493 flights · avg delay 7 min
- Noon to 3 PM80%
71 flights · avg delay 8 min
- 3 to 6 PM69%
542 flights · avg delay 21 min
- 6 to 9 PM58%
136 flights · avg delay 23 min
Best day: Wednesday (78%). Worst: Sunday (70%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft50%
- Airline (crew, maintenance, boarding)29%
- Air traffic control and airport volume19%
- Severe weather2%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
DEN to GRR questions
- What time of day is best to fly DEN to GRR?
- 9 AM to noon: 84% of flights arrived on time, against 58% for departures 6 to 9 PM.
- Which airline is most on time from DEN to GRR?
- Frontier, with a season-adjusted 83% chance of operating and arriving on time over 147 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on DEN to GRR?
- June (65% on time); the best was November (81%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from DEN
- GRR to DEN (return)
- DEN to PHX 75%
- DEN to SLC 77%
- DEN to LAX 79%
- DEN to LAS 75%
- DEN to SEA 73%
- DEN to ORD 70%
- DEN to DFW 75%
- DEN to SAN 76%
- DEN to MSP 78%
- DEN to ATL 80%
- DEN to SFO 68%
- DEN to AUS 76%
Live status: FAA delays and ground stops