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

No clear winner: Delta’s COS → ATL flights land within a few points of 9 in 10 on time whatever the hour.

Nonstops (seasonal or thin)


Delta	COS	ATL	2h 54m	89%	1.9%	589	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Atlanta on time. Total trip = scheduled departure to arrival, layover included (Atlanta is 2 h ahead of Colorado Springs). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	COS 18:20 → SLC 20:16DL 4449 · flown by SkyWest	3h 19m Salt Lake City	SLC 23:35 → ATL 05:15 +1DL 912	8h 55m	100%	87%
Delta Details →	COS 08:14 → SLC 10:15DL 3940 · flown by SkyWest	3h 20m Salt Lake City	SLC 13:35 → ATL 19:23DL 906	9h 09m	100%	84%
United Details →	COS 05:30 → DEN 06:35UA 4697 · flown by SkyWest	3h 25m Denver	DEN 10:00 → ATL 15:10UA 2424	7h 40m	100%	84%
Southwest + Deltatwo ticketsDetails →	COS 11:10 → DEN 12:05WN 4325	3h 10m Denver	DEN 15:15 → ATL 20:22DL 957	7h 12m	100%	84%
United + Deltatwo ticketsDetails →	COS 06:00 → DEN 07:05UA 5291 · flown by SkyWest	2h 35m Denver	DEN 09:40 → ATL 14:35DL 2235	6h 36m	97%	82%
Southwest + Deltatwo ticketsDetails →	COS 06:45 → PHX 07:35WN 4256	2h 46m Phoenix	PHX 10:21 → ATL 17:00DL 348	8h 15m	98%	81%
Delta Details →	COS 11:10 → MSP 14:30DL 4089 · flown by SkyWest	2h 45m Minneapolis	MSP 17:15 → ATL 20:56DL 1036	7h 46m	98%	81%
Southwest + Deltatwo ticketsDetails →	COS 06:10 → LAS 07:05WN 3313	3h 36m Las Vegas	LAS 10:41 → ATL 17:45DL 777	9h 31m	100%	81%
Tight connection: often missed
United Details →	COS 15:02 → DEN 16:15UA 4657 · flown by SkyWest	1h 33m Denver	DEN 17:48 → ATL 22:57UA 1305	5h 55m	74%	52%
American Details →	COS 17:15 → DFW 20:19AA 4956 · flown by SkyWest	51m Dallas-Fort Worth	DFW 21:10 → ATL 00:19 +1AA 2749	5h 04m	58%	29%
Southwest Details →	COS 16:55 → DEN 17:45WN 1222	1h 20m Denver	DEN 19:05 → ATL 00:55 +1WN 1472	5h 10m	54%	7%

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.

Morning

DEN · 1h 08m · leaves 07:45 3%

DFW · 1h 14m · leaves 08:01 5%

IAH · 52m · leaves 07:30 15%

Afternoon and evening

DFW · 51m · leaves 17:15 42%

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