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 1 time in 4 at 8 pm.

Nonstops


United	BIL	DEN	1h 52m	83%	0.7%	1,778	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	BIL 05:20 → SLC 06:42DL 1360	1h 03m Salt Lake City	SLC 07:45 → DEN 09:18DL 1317	3h 58m	95%	90%
Delta Details →	BIL 06:24 → MSP 09:30DL 2254	1h 30m Minneapolis	MSP 11:00 → DEN 12:10DL 2927	5h 46m	96%	78%
Alaska Details →	BIL 06:00 → SEA 07:12AS 2247 · flown by Horizon	52m Seattle	SEA 08:04 → DEN 11:56AS 375	5h 56m	88%	77%
Alaska Details →	BIL 13:45 → SEA 14:55AS 2055 · flown by Horizon	1h 31m Seattle	SEA 16:26 → DEN 20:10AS 602	6h 25m	95%	71%
Alaska Details →	BIL 15:43 → PDX 16:46AS 2297 · flown by Horizon	1h 18m Portland	PDX 18:04 → DEN 21:40AS 1627	5h 57m	95%	64%
American Details →	BIL 06:00 → DFW 09:55AA 3746 · flown by Envoy	46m Dallas-Fort Worth	DFW 10:41 → DEN 11:46AA 2359	5h 46m	84%	59%
American Details →	BIL 13:29 → DFW 17:20AA 3429 · flown by Envoy	1h 10m Dallas-Fort Worth	DFW 18:30 → DEN 19:41AA 2235	6h 12m	81%	36%
Tight connection: often missed
Delta Details →	BIL 18:40 → SLC 20:17DL 3828 · flown by SkyWest	48m Salt Lake City	SLC 21:05 → DEN 22:40DL 1667	4h 00m	74%	59%

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 03m · leaves 05:20 5%

SEA · 52m · leaves 06:00 12%

DFW · 46m · leaves 06:00 16%

Afternoon and evening

PDX · 1h 18m · leaves 15:43 5%

DFW · 1h 10m · leaves 13:29 19%

SLC · 48m · leaves 18:40 26%

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 United UA 2004 SLC 10:39 → DEN Connection details →	3h 57m	7h 04m	99%	89%
Delta DL 2254 BIL 06:24 → MSP United UA 2232 MSP 11:34 → DEN Connection details →	2h 04m	6h 21m	96%	89%
Alaska AS 2247 BIL 06:00 → SEA United UA 1505 SEA 08:56 → DEN Connection details →	1h 44m	6h 45m	94%	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