1,096 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

United is clearly ahead here: 83% of its flights arrive on time, 12 points better than Southwest.

Best time to leave 9–10 am 90% arrive on time from DEN

Best single flight UA 1479 DEN 09:45 → SDF 14:28 · 90% 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).

DEN

% 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	730	83%	0.5%	62 min
Southwest	366	71%	1.1%	59 min

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 1479	DEN 09:45	SDF 14:28	90%

All 5 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 1479	DEN 09:45	SDF 14:28	2h 43m	347	90%	0.6%	42 min
WN 1712	DEN 12:55	SDF 17:25	2h 30m	33	76%	0.0%	28 min
UA 2027	DEN 18:08	SDF 22:59	2h 51m	36	69%	0.0%	81 min
UA 514	DEN 18:08	SDF 22:59	2h 51m	56	64%	0.0%	63 min
WN 1070	DEN 19:40	SDF 00:18	2h 38m	16	27%	6.2%	71 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.


United	DEN	SDF	2h 41m	83%	0.5%	730	Flying now
Southwest	DEN	SDF	2h 25m	71%	1.1%	366	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