Sun, Oct 4 has passed, so this is the 12-month record.

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

No clear winner: United’s DAY → DEN flights land within a few points of 9 in 10 on time whatever the hour.

Nonstops (seasonal or thin)


United	DAY	DEN	3h 30m	91%	0.8%	365	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 Dayton). Layovers up to 4 hours. Pick a connection for the details.


United Details →	DAY 05:40 → ORD 05:55UA 4415 · flown by GoJet	2h 45m Chicago	ORD 08:40 → DEN 10:31UA 526	6h 51m	100%	90%
United Details →	DAY 07:15 → ORD 07:55UA 4402 · flown by GoJet	2h 59m Chicago	ORD 10:54 → DEN 12:45UA 581	7h 30m	94%	89%
American Details →	DAY 08:17 → ORD 08:50AA 3685 · flown by Envoy	1h 10m Chicago	ORD 10:00 → DEN 11:44AA 1744	5h 27m	96%	80%
Delta Details →	DAY 06:00 → ATL 07:42DL 3140	2h 08m Atlanta	ATL 09:50 → DEN 11:07DL 995	7h 07m	97%	79%
American Details →	DAY 05:50 → PHL 07:33AA 5587 · flown by PSA	2h 02m Philadelphia	PHL 09:35 → DEN 11:56AA 3312	8h 06m	99%	79%
United Details →	DAY 10:23 → IAD 11:53UA 4181 · flown by GoJet	2h 42m Dulles	IAD 14:35 → DEN 16:29UA 1126	8h 06m	96%	78%
Delta Details →	DAY 15:56 → ATL 17:40DL 2763	3h 14m Atlanta	ATL 20:54 → DEN 22:12DL 493	8h 16m	99%	77%
American Details →	DAY 06:31 → CLT 08:20AA 5234 · flown by PSA	3h 10m Charlotte	CLT 11:30 → DEN 12:56AA 1758	8h 25m	97%	77%
Tight connection: often missed
United Details →	DAY 11:39 → ORD 12:05UA 4453 · flown by GoJet	51m Chicago	ORD 12:56 → DEN 14:46UA 1150	5h 07m	71%	61%

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 11m · leaves 08:30 5%

Afternoon and evening

IAD · 1h 11m · leaves 14:53 15%

ORD · 1h 09m · leaves 18:15 16%

DFW · 1h 03m · leaves 13:34 21%

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.


Delta DL 3140 DAY 06:00 → ATL United UA 1327 ATL 11:10 → DEN Connection details →	3h 28m	8h 28m	98%	86%
American AA 5159 DAY 09:34 → DCA Frontier F9 687 DCA 13:59 → DEN Connection details →	2h 49m	8h 20m	96%	78%
American AA 5157 DAY 07:09 → DFW United UA 2049 DFW 11:35 → DEN Connection details →	2h 45m	7h 36m	96%	78%

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