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

Take the nonstop: United COU → DEN (2h 21m) reaches Denver on time 88% of the time; the most reliable connection, American via DFW (4h 45m), 48%.

Nonstops (seasonal or thin)


United	COU	DEN	2h 21m	89%	1.3%	309	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


American Details →	COU 06:20 → ORD 08:01AA 3655 · flown by Envoy	1h 59m Chicago	ORD 10:00 → DEN 11:44AA 1744	6h 24m	96%	79%
United Details →	COU 08:00 → ORD 09:40UA 5609 · flown by SkyWest	3h 16m Chicago	ORD 12:56 → DEN 14:46UA 1150	7h 46m	94%	79%
American Details →	COU 07:20 → CLT 10:25AA 4006 · flown by Envoy	1h 05m Charlotte	CLT 11:30 → DEN 12:56AA 1758	6h 36m	90%	73%
United Details →	COU 10:49 → ORD 12:30UA 4605 · flown by GoJet	1h 00m Chicago	ORD 13:30 → DEN 15:17UA 2802	5h 28m	89%	71%
American Details →	COU 06:55 → DFW 08:50AA 3525 · flown by Envoy	1h 51m Dallas-Fort Worth	DFW 10:41 → DEN 11:46AA 2359	5h 51m	95%	66%
United Details →	COU 15:25 → ORD 17:05UA 5869 · flown by SkyWest	2h 58m Chicago	ORD 20:03 → DEN 22:04UA 329	7h 39m	91%	64%
American Details →	COU 10:32 → ORD 12:04AA 3480 · flown by Envoy	3h 11m Chicago	ORD 15:15 → DEN 17:00AA 1734	7h 28m	97%	63%
American Details →	COU 18:32 → ORD 20:23AA 3479 · flown by Envoy	2h 11m Chicago	ORD 22:34 → DEN 00:17 +1AA 1387	6h 44m	95%	48%
Tight connection: often missed
United Details →	COU 15:25 → ORD 17:05UA 5869 · flown by SkyWest	1h 12m Chicago	ORD 18:17 → DEN 20:22UA 1974	5h 57m	74%	39%

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

CLT · 1h 05m · leaves 07:20 10%

ORD · 1h 14m · leaves 08:00 17%

Afternoon and evening

DFW · 1h 15m · leaves 17:19 20%

ORD · 1h 12m · leaves 15:25 26%

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.


American AA 3655 COU 06:20 → ORD United UA 581 ORD 10:54 → DEN Connection details →	2h 53m	7h 25m	97%	93%
American AA 3525 COU 06:55 → DFW United UA 2049 DFW 11:35 → DEN Connection details →	2h 45m	6h 50m	96%	78%
American AA 3480 COU 10:32 → ORD United UA 2803 ORD 14:33 → DEN Connection details →	2h 29m	6h 59m	93%	70%

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