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 6% of the time at 12 pm and barely half the time at 8 pm.

Nonstops


United	DEN	CMH	2h 53m	84%	0.7%	728	Flying now
Frontier	DEN	CMH	2h 56m	83%	0.8%	122	Flying now
Southwest	DEN	CMH	2h 40m	67%	0.8%	919	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	DEN 05:35 → STL 08:35WN 1751	1h 30m St Louis	STL 10:05 → CMH 12:28WN 3902	4h 50m	98%	90%
Delta Details →	DEN 14:59 → DTW 19:53DL 1648	2h 57m Detroit	DTW 22:50 → CMH 23:56DL 5634 · flown by Republic	6h 57m	98%	88%
United Details →	DEN 23:59 → IAD 05:27UA 1924	2h 58m Dulles	IAD 08:25 → CMH 09:49 +1UA 4076 · flown by Mesa	7h 50m	100%	88%
United Details →	DEN 05:00 → IAH 08:32UA 320	3h 43m Houston	IAH 12:15 → CMH 16:05UA 4072 · flown by Mesa	9h 05m	100%	88%
Southwest Details →	DEN 05:45 → LAS 06:40WN 3106	1h 00m Las Vegas	LAS 07:40 → CMH 14:40WN 2212	6h 55m	100%	88%
Delta Details →	DEN 05:45 → ATL 10:42DL 341	3h 43m Atlanta	ATL 14:25 → CMH 15:59DL 2200	8h 15m	99%	86%
Delta Details →	DEN 06:05 → DTW 10:57DL 1745	1h 21m Detroit	DTW 12:18 → CMH 13:27DL 5774 · flown by Republic	5h 22m	96%	85%
Delta Details →	DEN 00:40 → ATL 05:42DL 302	1h 48m Atlanta	ATL 07:30 → CMH 09:02DL 1479	6h 25m	98%	85%
Tight connection: often missed
United Details →	DEN 16:29 → ORD 20:14UA 675	1h 16m Chicago	ORD 21:30 → CMH 23:59UA 1492	5h 30m	74%	48%
United Details →	DEN 15:01 → ORD 18:46UA 1023	59m Chicago	ORD 19:45 → CMH 22:24UA 3614 · flown by Republic	5h 23m	60%	42%
American Details →	DEN 07:13 → PHX 08:08AA 1404	46m Phoenix	PHX 08:54 → CMH 15:47AA 1689	6h 39m	60%	40%

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

LAX · 1h 13m · leaves 08:00 4%

AUS · 1h 00m · leaves 06:48 4%

IAD · 1h 04m · leaves 06:13 6%

Afternoon and evening

PHL · 51m · leaves 15:13 46%

DAL · 1h 10m · leaves 15:55 48%

DFW · 50m · leaves 16:23 51%

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.


Frontier F9 3294 DEN 06:30 → ATL Delta DL 2200 ATL 14:25 → CMH Connection details →	2h 47m	7h 30m	98%	85%
United UA 2656 DEN 23:59 → BOS American AA 4399 BOS 08:09 → CMH Connection details →	2h 11m	8h 31m	98%	84%
American AA 1747 DEN 09:08 → ORD United UA 3570 ORD 16:34 → CMH Connection details →	3h 38m	8h 05m	99%	82%

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