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 DEN → BIL flights land within a few points of 82% on time whatever the hour.

Nonstops


United	DEN	BIL	1h 41m	82%	0.6%	1,778	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Billings on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


Alaska Details →	DEN 08:00 → PDX 09:46AS 1626	2h 27m Portland	PDX 12:13 → BIL 15:03AS 2368 · flown by Horizon	7h 03m	98%	92%
Delta Details →	DEN 05:40 → SLC 07:13DL 2544	2h 27m Salt Lake City	SLC 09:40 → BIL 11:09DL 4038 · flown by SkyWest	5h 29m	97%	92%
Delta Details →	DEN 12:45 → SLC 14:18DL 1553	2h 15m Salt Lake City	SLC 16:33 → BIL 18:00DL 3828 · flown by SkyWest	5h 15m	98%	86%
Alaska Details →	DEN 16:36 → SEA 18:38AS 535	2h 21m Seattle	SEA 20:59 → BIL 23:51AS 2457 · flown by Horizon	7h 15m	93%	84%
American Details →	DEN 06:20 → DFW 09:27AA 2078	1h 33m Dallas-Fort Worth	DFW 11:00 → BIL 12:59AA 3429 · flown by Envoy	6h 39m	95%	82%
Alaska Details →	DEN 06:02 → SEA 08:05AS 643	2h 04m Seattle	SEA 10:09 → BIL 13:05AS 2054 · flown by Horizon	7h 03m	97%	79%
Delta Details →	DEN 16:05 → MSP 19:15DL 2271	3h 00m Minneapolis	MSP 22:15 → BIL 23:30DL 2941	7h 25m	98%	78%
Delta Details →	DEN 15:55 → SLC 17:34DL 1623	3h 51m Salt Lake City	SLC 21:25 → BIL 22:50DL 1340	6h 54m	97%	77%
Tight connection: often missed
Alaska Details →	DEN 12:55 → SEA 14:53AS 381	56m Seattle	SEA 15:49 → BIL 18:42AS 2353 · flown by Horizon	5h 47m	72%	60%
Delta Details →	DEN 19:00 → SLC 20:38DL 2663	47m Salt Lake City	SLC 21:25 → BIL 22:50DL 1340	3h 49m	52%	41%

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

SLC · 1h 04m · leaves 07:05 7%

Afternoon and evening

SLC · 47m · leaves 19:00 48%

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.


Southwest WN 300 DEN 07:45 → PDX Alaska AS 2368 PDX 12:13 → BIL Connection details →	2h 48m	7h 18m	100%	94%
Southwest WN 1731 DEN 11:45 → SLC Delta DL 3828 SLC 16:33 → BIL Connection details →	3h 08m	6h 15m	100%	89%
Frontier F9 3219 DEN 06:00 → SLC Delta DL 4038 SLC 09:40 → BIL Connection details →	2h 09m	5h 09m	92%	86%

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