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 5% of the time at 7 am and 23% of the time at 9 pm.

Nonstops (seasonal or thin)


Alaska	BIL	PDX	2h 04m	90%	0.8%	353	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Alaska Details →	BIL 06:00 → SEA 07:12AS 2247 · flown by Horizon	3h 02m Seattle	SEA 10:14 → PDX 11:21AS 3090 · flown by SkyWest	6h 21m	100%	96%
Delta Details →	BIL 11:50 → SLC 13:26DL 4038 · flown by SkyWest	1h 58m Salt Lake City	SLC 15:24 → PDX 16:19DL 1244	5h 29m	100%	87%
United Details →	BIL 10:40 → DEN 12:33UA 5463 · flown by SkyWest	54m Denver	DEN 13:27 → PDX 15:13UA 2455	5h 33m	96%	86%
Delta Details →	BIL 18:40 → SLC 20:17DL 3828 · flown by SkyWest	2h 33m Salt Lake City	SLC 22:50 → PDX 23:44DL 1373	6h 05m	97%	86%
United Details →	BIL 05:00 → DEN 06:53UA 5829 · flown by SkyWest	1h 12m Denver	DEN 08:05 → PDX 09:47UA 1247	5h 47m	96%	85%
Delta Details →	BIL 06:24 → MSP 09:30DL 2254	1h 30m Minneapolis	MSP 11:00 → PDX 12:40DL 2167	7h 16m	96%	83%
Delta Details →	BIL 05:20 → SLC 06:42DL 1360	1h 03m Salt Lake City	SLC 07:45 → PDX 08:38DL 1203	4h 17m	95%	82%
Alaska Details →	BIL 19:22 → SEA 20:35AS 2084 · flown by Horizon	2h 51m Seattle	SEA 23:26 → PDX 00:22 +1AS 2377 · flown by Horizon	6h 00m	99%	80%
Tight connection: often missed
United Details →	BIL 16:10 → DEN 18:03UA 5590 · flown by SkyWest	1h 27m Denver	DEN 19:30 → PDX 21:15UA 498	6h 05m	61%	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 12m · leaves 05:00 4%

SLC · 1h 03m · leaves 05:20 5%

Afternoon and evening

SEA · 53m · leaves 19:22 23%

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 1360 BIL 05:20 → SLC Alaska AS 3004 SLC 08:20 → PDX Connection details →	1h 38m	5h 06m	93%	87%
Alaska AS 2247 BIL 06:00 → SEA Delta DL 3818 SEA 09:30 → PDX Connection details →	2h 18m	5h 39m	96%	87%
United UA 5463 BIL 10:40 → DEN Frontier F9 2553 DEN 15:08 → PDX Connection details →	2h 35m	7h 13m	99%	85%

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