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

No clear winner: Delta’s SLC → BIL flights land within a few points of 88% on time whatever the hour.

Nonstops


Delta	SLC	BIL	1h 29m	88%	0.5%	1,074	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 →	SLC 08:20 → PDX 09:26AS 3004 · flown by SkyWest	2h 47m Portland	PDX 12:13 → BIL 15:03AS 2368 · flown by Horizon	6h 43m	100%	94%
Alaska Details →	SLC 16:00 → SEA 17:16AS 734	3h 43m Seattle	SEA 20:59 → BIL 23:51AS 2457 · flown by Horizon	7h 51m	99%	89%
American Details →	SLC 05:00 → DFW 08:46AA 1214	2h 14m Dallas-Fort Worth	DFW 11:00 → BIL 12:59AA 3429 · flown by Envoy	7h 59m	99%	84%
United Details →	SLC 05:15 → DEN 06:54UA 5683 · flown by SkyWest	1h 01m Denver	DEN 07:55 → BIL 09:36UA 4762 · flown by SkyWest	4h 21m	95%	82%
United Details →	SLC 08:30 → DEN 10:27UA 5642 · flown by SkyWest	3h 18m Denver	DEN 13:45 → BIL 15:29UA 5845 · flown by SkyWest	6h 59m	98%	81%
Alaska Details →	SLC 11:17 → SEA 12:30AS 796	3h 19m Seattle	SEA 15:49 → BIL 18:42AS 2353 · flown by Horizon	7h 25m	99%	81%
Alaska Details →	SLC 06:23 → SEA 07:35AS 1444	2h 34m Seattle	SEA 10:09 → BIL 13:05AS 2054 · flown by Horizon	6h 42m	100%	81%
United Details →	SLC 07:00 → DEN 08:42UA 1232	3h 03m Denver	DEN 11:45 → BIL 13:22UA 703	6h 22m	99%	79%
Tight connection: often missed
Alaska Details →	SLC 18:44 → SEA 20:00AS 665	59m Seattle	SEA 20:59 → BIL 23:51AS 2457 · flown by Horizon	5h 07m	54%	49%

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

DEN · 1h 01m · leaves 05:15 5%

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 1203 SLC 07:45 → PDX Alaska AS 2368 PDX 12:13 → BIL Connection details →	3h 35m	7h 18m	99%	90%
Delta DL 871 SLC 17:20 → SEA Alaska AS 2457 SEA 20:59 → BIL Connection details →	2h 23m	6h 31m	94%	85%
Frontier F9 3862 SLC 08:16 → DEN United UA 5845 DEN 13:45 → BIL Connection details →	3h 44m	7h 13m	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