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1,235 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

United is clearly ahead here: 4 in 5 of its flights arrive on time, 10 points better than Southwest.

Best time to leave 3–4 pm 88% arrive on time from DEN
Best single flight UA 2637 DEN 09:58 → GRR 14:35 · 88% on time Avoid UA 2121 DEN 17:55 → GRR 22:35 · 71% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

9
10
11
12
13
14
15
16
17
18
DEN
89
87
79
83
75
74
62
% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Pick an hour to see this route’s flights leaving then.

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.
United (incl. SkyWest) 728 79% 0.1% 56 min
Southwest 359 69% 0.3% 46 min
Frontier 148 – 0.0% 68 min

Dimmed: fewer than 150 flights in the year, too few to rank.

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.
UA 2637 DEN 09:58 GRR 14:35 88%
UA 2121 DEN 17:55 GRR 22:35 71%

All 4 flights in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.
UA 2637 DEN 09:58 GRR 14:35 2h 37m 309 88% 0.0% 42 min
WN 1539 DEN 12:55 GRR 17:15 2h 20m 50 58% 0.0% 30 min
F9 1248 DEN 15:08 GRR 19:44 2h 34m 148 89% 0.0% 68 min
UA 2121 DEN 17:55 GRR 22:35 2h 40m 206 71% 0.5% 69 min

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.
Frontier DEN GRR 2h 34m 89% 0.0% 148 Flying now
United DEN GRR 2h 35m 79% 0.1% 728 Flying now
Southwest DEN GRR 2h 25m 69% 0.3% 359 Flying now
Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON