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

Connect in the morning. The same one-hour layover misses 13% of the time at 11 am and 29% of the time at 6 pm.

Nonstops (seasonal or thin)


Delta	COS	SLC	1h 56m	93%	0.1%	721	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Salt Lake City on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	COS 05:45 → DEN 06:45WN 1220	1h 00m Denver	DEN 07:45 → SLC 09:20WN 452	3h 35m	96%	86%
United Details →	COS 05:30 → DEN 06:35UA 4697 · flown by SkyWest	1h 25m Denver	DEN 08:00 → SLC 09:37UA 497	4h 07m	95%	85%
United Details →	COS 08:45 → DEN 10:02UA 4725 · flown by SkyWest	3h 38m Denver	DEN 13:40 → SLC 15:13UA 1840	6h 28m	99%	83%
United Details →	COS 07:05 → DEN 08:10UA 4696 · flown by SkyWest	3h 30m Denver	DEN 11:40 → SLC 13:13UA 1963	6h 08m	100%	79%
United Details →	COS 17:07 → DEN 18:20UA 4719 · flown by SkyWest	2h 45m Denver	DEN 21:05 → SLC 22:44UA 5646 · flown by SkyWest	5h 37m	95%	74%
United Details →	COS 11:31 → DEN 12:45UA 4675 · flown by SkyWest	3h 44m Denver	DEN 16:29 → SLC 18:10UA 5261 · flown by SkyWest	6h 39m	99%	73%
United Details →	COS 13:30 → DEN 14:24UA 730	3h 21m Denver	DEN 17:45 → SLC 19:25UA 5762 · flown by SkyWest	5h 55m	97%	71%
Southwest Details →	COS 12:20 → SAN 13:35WN 1232	2h 10m San Diego	SAN 15:45 → SLC 18:40WN 4810	6h 20m	96%	48%
Tight connection: often missed
United Details →	COS 15:02 → DEN 16:15UA 4657 · flown by SkyWest	1h 30m Denver	DEN 17:45 → SLC 19:25UA 5762 · flown by SkyWest	4h 23m	74%	53%
United Details →	COS 17:07 → DEN 18:20UA 4719 · flown by SkyWest	1h 03m Denver	DEN 19:23 → SLC 20:56UA 2769	3h 49m	71%	37%
American Details →	COS 17:15 → DFW 20:19AA 4956 · flown by SkyWest	51m Dallas-Fort Worth	DFW 21:10 → SLC 22:59AA 2993	5h 44m	58%	24%

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 00m · leaves 05:45 4%

Afternoon and evening

DEN · 1h 03m · leaves 17:07 29%

PHX · 1h 05m · leaves 20:55 32%

DFW · 51m · leaves 17:15 42%

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.


Southwest WN 4256 COS 06:45 → PHX Delta DL 1447 PHX 09:45 → SLC Connection details →	2h 10m	5h 38m	98%	91%
Southwest WN 3313 COS 06:10 → LAS Delta DL 1698 LAS 10:00 → SLC Connection details →	2h 55m	6h 17m	100%	89%
United UA 4725 COS 08:45 → DEN Frontier F9 3981 DEN 13:18 → SLC Connection details →	3h 16m	6h 10m	99%	84%

Rank all connections, any airlines →

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