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 31% of the time at 8 pm.

Nonstops


Allegiant	DEN	TYS	2h 47m	82%	0.0%	66	Flying now
Frontier	DEN	TYS	2h 50m	81%	0.0%	134	Flying now
United	DEN	TYS	2h 56m	80%	0.5%	728	Flying now
Southwest	DEN	TYS	2h 50m	77%	0.0%	73	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	DEN 00:40 → ATL 05:42DL 302	2h 57m Atlanta	ATL 08:39 → TYS 09:38DL 1290	6h 58m	99%	88%
American Details →	DEN 23:59 → CLT 05:13AA 3156	1h 59m Charlotte	CLT 07:12 → TYS 08:31 +1AA 5947 · flown by Piedmont	6h 32m	97%	85%
United Details →	DEN 07:42 → IAH 11:15UA 1720	3h 30m Houston	IAH 14:45 → TYS 18:07UA 6211 · flown by Mesa	8h 25m	100%	84%
Delta Details →	DEN 00:59 → DTW 05:48DL 1096	2h 52m Detroit	DTW 08:40 → TYS 10:22DL 5347 · flown by Endeavor	7h 27m	97%	82%
Delta Details →	DEN 14:15 → ATL 19:20DL 706	3h 33m Atlanta	ATL 22:53 → TYS 23:52DL 2081	7h 39m	99%	81%
American Details →	DEN 06:41 → CLT 12:04AA 573	2h 20m Charlotte	CLT 14:24 → TYS 15:42AA 5831 · flown by Piedmont	7h 01m	98%	80%
Delta Details →	DEN 05:45 → ATL 10:42DL 341	3h 10m Atlanta	ATL 13:52 → TYS 14:49DL 1148	7h 04m	99%	78%
United Details →	DEN 06:13 → IAD 11:41UA 1279	1h 09m Dulles	IAD 12:50 → TYS 14:27UA 6110 · flown by Mesa	6h 14m	94%	77%
Tight connection: often missed
United Details →	DEN 15:40 → IAD 21:11UA 421	59m Dulles	IAD 22:10 → TYS 23:54UA 4304 · flown by CommuteAir	6h 14m	70%	53%
United Details →	DEN 12:26 → IAD 17:58UA 2853	48m Dulles	IAD 18:46 → TYS 20:34UA 4914 · flown by CommuteAir	6h 08m	66%	49%
American Details →	DEN 15:57 → CLT 21:27AA 1735	1h 11m Charlotte	CLT 22:38 → TYS 23:49AA 5511 · flown by PSA	5h 53m	63%	26%

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

MCO · 1h 20m · leaves 05:00 0%

IAD · 1h 09m · leaves 06:13 6%

ORD · 48m · leaves 06:00 23%

Afternoon and evening

CLT · 1h 11m · leaves 15:57 37%

ATL · 48m · leaves 13:15 41%

ORD · 50m · leaves 13:25 47%

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 1450 DEN 23:46 → ATL Delta DL 1290 ATL 08:39 → TYS Connection details →	3h 37m	7h 52m	98%	86%
Southwest WN 4170 DEN 14:35 → ATL Delta DL 3072 ATL 22:53 → TYS Connection details →	3h 23m	7h 19m	96%	77%
Frontier F9 3294 DEN 06:30 → ATL Delta DL 1148 ATL 13:52 → TYS Connection details →	2h 14m	6h 19m	96%	76%

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