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 75-minute layover misses 4% of the time at 7 am and 1 time in 5 at 8 pm.

Nonstops (seasonal or thin)


Alaska	BIL	SEA	2h 12m	86%	1.1%	918	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Seattle on time. Total trip = scheduled departure to arrival, layover included (Seattle is 1 h behind Billings). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	BIL 18:40 → SLC 20:17DL 3828 · flown by SkyWest	2h 28m Salt Lake City	SLC 22:45 → SEA 23:59DL 2998	6h 19m	97%	88%
Delta Details →	BIL 05:20 → SLC 06:42DL 1360	1h 08m Salt Lake City	SLC 07:50 → SEA 09:05DL 2874	4h 45m	95%	88%
United Details →	BIL 05:00 → DEN 06:53UA 5829 · flown by SkyWest	1h 08m Denver	DEN 08:01 → SEA 10:00UA 2271	6h 00m	96%	87%
Delta Details →	BIL 06:24 → MSP 09:30DL 2254	1h 40m Minneapolis	MSP 11:10 → SEA 12:58DL 889	7h 34m	97%	83%
United Details →	BIL 10:40 → DEN 12:33UA 5463 · flown by SkyWest	1h 27m Denver	DEN 14:00 → SEA 16:00UA 2164	6h 20m	99%	82%
Delta Details →	BIL 11:50 → SLC 13:26DL 4038 · flown by SkyWest	3h 54m Salt Lake City	SLC 17:20 → SEA 18:36DL 871	7h 46m	100%	81%
United Details →	BIL 07:00 → DEN 08:50UA 557	2h 32m Denver	DEN 11:22 → SEA 13:22UA 1424	7h 22m	92%	76%
United Details →	BIL 14:25 → DEN 16:15UA 478	2h 55m Denver	DEN 19:10 → SEA 21:10UA 360	7h 45m	98%	67%
Tight connection: often missed
United Details →	BIL 16:10 → DEN 18:03UA 5590 · flown by SkyWest	1h 07m Denver	DEN 19:10 → SEA 21:10UA 360	6h 00m	54%	37%
American Details →	BIL 12:53 → ORD 16:54AA 3428 · flown by Envoy	53m Chicago	ORD 17:47 → SEA 20:37AA 3105	8h 44m	73%	32%

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 08m · leaves 05:00 4%

SLC · 1h 08m · leaves 05:20 5%

DFW · 52m · leaves 06:00 13%

Afternoon and evening

DEN · 1h 18m · leaves 18:00 19%

ORD · 53m · leaves 12:53 27%

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.


United UA 5829 BIL 05:00 → DEN Alaska AS 317 DEN 08:40 → SEA Connection details →	1h 47m	6h 42m	96%	77%
Alaska AS 2297 BIL 15:43 → PDX Delta DL 3923 PDX 20:44 → SEA Connection details →	3h 58m	7h 13m	98%	76%
United UA 557 BIL 07:00 → DEN Frontier F9 1175 DEN 12:00 → SEA Connection details →	3h 10m	8h 04m	92%	71%

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