Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: Southwest’s COS → DAL flights land within a few points of 83% on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	COS	DAL	1h 50m	83%	0.9%	799	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Dallas on time. Total trip = scheduled departure to arrival, layover included (Dallas is 1 h ahead of Colorado Springs). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	COS 06:00 → ATL 10:54DL 1074	3h 05m Atlanta	ATL 13:59 → DAL 15:03DL 512	8h 12m	99%	83%
Southwest Details →	COS 06:10 → LAS 07:05WN 3313	3h 33m Las Vegas	LAS 10:38 → DAL 15:25WN 2218	8h 16m	100%	82%
Delta Details →	COS 13:40 → ATL 18:45DL 2427	2h 30m Atlanta	ATL 21:15 → DAL 22:34DL 1104	7h 54m	96%	75%
Southwest Details →	COS 10:05 → HOU 13:32WN 1223	2h 28m Houston	HOU 16:00 → DAL 17:10WN 40	6h 05m	100%	74%
Southwest Details →	COS 06:45 → PHX 07:35WN 4256	3h 20m Phoenix	PHX 10:55 → DAL 15:20WN 3255	7h 35m	100%	74%
Southwest Details →	COS 05:45 → DEN 06:45WN 1220	3h 20m Denver	DEN 10:05 → DAL 13:10WN 1518	6h 25m	98%	72%
United + Southwesttwo ticketsDetails →	COS 05:30 → DEN 06:35UA 4697 · flown by SkyWest	2h 10m Denver	DEN 08:45 → DAL 11:40WN 1360	5h 10m	95%	68%
United + Southwesttwo ticketsDetails →	COS 07:05 → DEN 08:10UA 4696 · flown by SkyWest	3h 30m Denver	DEN 11:40 → DAL 14:45WN 2354	6h 40m	98%	62%
Tight connection: often missed
Southwest Details →	COS 12:35 → LAS 13:35WN 3257	50m Las Vegas	LAS 14:25 → DAL 19:10WN 4489	5h 35m	54%	30%
Southwest Details →	COS 16:55 → DEN 17:45WN 1222	1h 20m Denver	DEN 19:05 → DAL 22:05WN 1522	4h 10m	54%	13%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Afternoon and evening

DEN · 1h 20m · leaves 16:55 46%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

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