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 6% of the time at 9 am and almost half the time at 5 pm.

Nonstops (seasonal or thin)


Delta	SLC	STL	2h 53m	85%	0.6%	981	Flying now
Southwest	SLC	STL	–	89%few flights	0.0%	9	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	SLC 05:42 → DEN 07:08WN 3737	2h 57m Denver	DEN 10:05 → STL 13:20WN 1753	6h 38m	100%	94%
Delta Details →	SLC 23:35 → ATL 05:15DL 912	2h 28m Atlanta	ATL 07:43 → STL 08:19 +1DL 1571	7h 44m	99%	88%
American Details →	SLC 23:25 → CLT 05:22AA 2611	2h 14m Charlotte	CLT 07:36 → STL 08:32 +1AA 2733	8h 07m	96%	88%
Delta Details →	SLC 07:00 → ATL 12:44DL 907	1h 25m Atlanta	ATL 14:09 → STL 14:48DL 2700	6h 50m	98%	87%
United Details →	SLC 08:30 → DEN 10:27UA 5642 · flown by SkyWest	2h 58m Denver	DEN 13:25 → STL 16:33UA 1639	7h 03m	98%	85%
United Details →	SLC 05:10 → ORD 09:41UA 5635 · flown by SkyWest	59m Chicago	ORD 10:40 → STL 12:11UA 1355	6h 01m	97%	83%
United Details →	SLC 05:15 → DEN 06:54UA 5683 · flown by SkyWest	2h 41m Denver	DEN 09:35 → STL 12:42UA 652	6h 27m	99%	83%
Alaska Details →	SLC 08:20 → PDX 09:26AS 3004 · flown by SkyWest	1h 23m Portland	PDX 10:49 → STL 16:37AS 1635	7h 17m	100%	80%
Tight connection: often missed
Alaska Details →	SLC 16:00 → SEA 17:16AS 734	48m Seattle	SEA 18:04 → STL 23:59AS 615	6h 59m	54%	46%
United Details →	SLC 17:57 → DEN 19:40UA 1910	1h 05m Denver	DEN 20:45 → STL 23:57UA 214	5h 00m	72%	42%
United Details →	SLC 09:49 → SFO 11:13UA 5970 · flown by SkyWest	59m San Francisco	SFO 12:12 → STL 18:17UA 2090	7h 28m	35%	26%

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

DTW · 1h 05m · leaves 06:00 4%

DEN · 53m · leaves 07:00 6%

IAH · 1h 03m · leaves 06:45 6%

Afternoon and evening

ORD · 55m · leaves 12:35 36%

SEA · 48m · leaves 16:00 46%

DEN · 1h 00m · leaves 16:45 72%

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 5683 SLC 05:15 → DEN Southwest WN 1753 DEN 10:05 → STL Connection details →	3h 11m	7h 05m	98%	94%
Delta DL 1698 SLC 08:25 → LAS Southwest WN 2369 LAS 11:10 → STL Connection details →	2h 17m	7h 00m	99%	88%
Frontier F9 3862 SLC 08:16 → DEN United UA 1639 DEN 13:25 → STL Connection details →	3h 24m	7h 17m	98%	86%

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