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 4% of the time at 7 am and 1 time in 5 at 8 pm.

Nonstops (seasonal or thin)


American	BIL	ORD	2h 54m	81%	0.4%	231	Flying now
United	BIL	ORD	3h 00m	83%	0.0%	86	Not flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


Alaska + Americantwo ticketsDetails →	BIL 19:22 → SEA 20:35AS 2084 · flown by Horizon	3h 21m Seattle	SEA 23:56 → ORD 06:02 +1AA 2881	9h 40m	98%	89%
United Details →	BIL 05:00 → DEN 06:53UA 5829 · flown by SkyWest	47m Denver	DEN 07:40 → ORD 11:23UA 1928	5h 23m	92%	85%
Delta Details →	BIL 05:20 → SLC 06:42DL 1360	1h 08m Salt Lake City	SLC 07:50 → ORD 12:00DL 2247	5h 40m	95%	83%
Alaska Details →	BIL 13:45 → SEA 14:55AS 2055 · flown by Horizon	2h 53m Seattle	SEA 17:48 → ORD 23:59AS 538	9h 14m	98%	78%
Alaska Details →	BIL 06:00 → SEA 07:12AS 2247 · flown by Horizon	1h 22m Seattle	SEA 08:34 → ORD 14:46AS 265	7h 46m	96%	73%
Delta Details →	BIL 11:50 → SLC 13:26DL 4038 · flown by SkyWest	3h 55m Salt Lake City	SLC 17:21 → ORD 21:29DL 2413	8h 43m	100%	73%
United Details →	BIL 07:00 → DEN 08:50UA 557	2h 25m Denver	DEN 11:15 → ORD 14:55UA 2865	6h 55m	92%	73%
American + Frontiertwo ticketsDetails →	BIL 06:00 → DFW 09:55AA 3746 · flown by Envoy	3h 24m Dallas-Fort Worth	DFW 13:19 → ORD 15:59F9 1342	9h 02m	98%	73%
Tight connection: often missed
United Details →	BIL 16:10 → DEN 18:03UA 5590 · flown by SkyWest	1h 07m Denver	DEN 19:10 → ORD 22:49UA 2258	5h 39m	54%	38%

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 07m · leaves 05:00 4%

SLC · 1h 08m · leaves 05:20 5%

DFW · 50m · leaves 06:00 13%

Afternoon and evening

DFW · 1h 18m · leaves 13:29 13%

DEN · 1h 13m · leaves 18:00 21%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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