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 5% of the time at 9 am and 36% of the time at 10 pm.

Nonstops


United	CMH	DEN	3h 15m	83%	0.8%	728	Flying now
Southwest	CMH	DEN	3h 10m	80%	0.4%	919	Flying now
Frontier	CMH	DEN	3h 16m	72%	0.8%	122	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 2 h behind Columbus). Layovers up to 4 hours. Pick a connection for the details.


United Details →	CMH 07:00 → ORD 07:39UA 3429 · flown by Republic	3h 15m Chicago	ORD 10:54 → DEN 12:45UA 581	7h 45m	98%	95%
American Details →	CMH 05:08 → MIA 07:51AA 3662 · flown by Envoy	1h 06m Miami	MIA 08:57 → DEN 11:19AA 1739	8h 11m	97%	92%
Southwest Details →	CMH 05:10 → MCO 07:20WN 1193	2h 25m Orlando	MCO 09:45 → DEN 11:35WN 2630	8h 25m	100%	92%
Southwest Details →	CMH 07:12 → STL 07:38WN 1207	1h 04m St Louis	STL 08:42 → DEN 10:02WN 3910	4h 50m	100%	90%
United Details →	CMH 05:30 → ORD 06:09UA 3524 · flown by Republic	2h 31m Chicago	ORD 08:40 → DEN 10:31UA 526	7h 01m	98%	88%
United Details →	CMH 17:01 → IAH 19:04UA 4074 · flown by Mesa	3h 06m Houston	IAH 22:10 → DEN 23:57UA 1066	8h 56m	97%	87%
Delta Details →	CMH 08:08 → ATL 09:45DL 3165	3h 05m Atlanta	ATL 12:50 → DEN 14:04DL 957	7h 56m	97%	86%
United Details →	CMH 07:15 → LAX 09:06UA 354	1h 49m Los Angeles	LAX 10:55 → DEN 14:27UA 2061	9h 12m	94%	86%
Tight connection: often missed
American Details →	CMH 08:29 → ORD 09:10AA 3572 · flown by Envoy	50m Chicago	ORD 10:00 → DEN 11:44AA 1744	5h 15m	69%	57%
Southwest Details →	CMH 20:08 → MDW 20:22WN 1200	1h 03m Chicago	MDW 21:25 → DEN 23:05WN 2770	5h 02m	65%	36%
American Details →	CMH 15:44 → CLT 17:31AA 5134 · flown by PSA	1h 01m Charlotte	CLT 18:32 → DEN 20:17AA 1736	6h 33m	72%	34%

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

STL · 1h 04m · leaves 07:12 0%

MSP · 52m · leaves 07:00 5%

ATL · 1h 08m · leaves 07:05 5%

Afternoon and evening

ATL · 1h 05m · leaves 17:52 40%

ORD · 50m · leaves 21:14 41%

BWI · 1h 00m · leaves 17:35 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.


American AA 4041 CMH 06:49 → ORD United UA 581 ORD 10:54 → DEN Connection details →	3h 24m	7h 56m	97%	94%
Southwest WN 4477 CMH 06:50 → BNA United UA 502 BNA 10:26 → DEN Connection details →	3h 16m	7h 33m	100%	92%
Delta DL 2403 CMH 07:00 → MSP United UA 2232 MSP 11:34 → DEN Connection details →	3h 31m	7h 45m	98%	91%

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