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 3% of the time at 9 am and 14% of the time at 10 pm.

Nonstops


United	STL	DEN	2h 33m	80%	0.6%	1,210	Flying now
Frontier	STL	DEN	2h 36m	76%	0.7%	291	Flying now
Southwest	STL	DEN	2h 20m	75%	0.0%	2,175	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 (Denver is 1 h behind St Louis). Layovers up to 4 hours. Pick a connection for the details.


United Details →	STL 06:00 → ORD 07:30UA 2805	3h 24m Chicago	ORD 10:54 → DEN 12:45UA 581	7h 45m	97%	95%
Southwest Details →	STL 05:05 → MCO 08:25WN 4358	1h 20m Orlando	MCO 09:45 → DEN 11:35WN 2630	7h 30m	100%	92%
United Details →	STL 08:35 → IAH 10:50UA 4579 · flown by GoJet	1h 43m Houston	IAH 12:33 → DEN 14:17UA 2168	6h 42m	97%	84%
Delta Details →	STL 07:08 → ATL 09:45DL 1536	2h 00m Atlanta	ATL 11:45 → DEN 12:59DL 706	6h 51m	98%	83%
Southwest Details →	STL 06:00 → LAS 07:25WN 3934	1h 30m Las Vegas	LAS 08:55 → DEN 11:50WN 247	6h 50m	94%	83%
Southwest Details →	STL 08:10 → MCI 09:15WN 3943	1h 25m Kansas City	MCI 10:40 → DEN 11:25WN 2548	4h 15m	100%	81%
Delta Details →	STL 06:21 → MSP 07:57DL 1597	3h 03m Minneapolis	MSP 11:00 → DEN 12:10DL 2927	6h 49m	98%	80%
Southwest Details →	STL 05:45 → PHX 06:55WN 3967	1h 55m Phoenix	PHX 08:50 → DEN 11:35WN 3261	6h 50m	100%	80%
Tight connection: often missed
Delta Details →	STL 15:57 → MSP 17:40DL 4167 · flown by SkyWest	1h 05m Minneapolis	MSP 18:45 → DEN 19:56DL 2931	5h 04m	69%	45%
American Details →	STL 13:14 → DFW 15:10AA 5655 · flown by PSA	1h 03m Dallas-Fort Worth	DFW 16:13 → DEN 17:19AA 1322	5h 05m	64%	28%
American Details →	STL 20:14 → ORD 21:45AA 4144 · flown by Envoy	49m Chicago	ORD 22:34 → DEN 00:17 +1AA 1387	5h 02m	54%	27%

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

MCO · 1h 20m · leaves 05:05 0%

ATL · 1h 12m · leaves 06:00 3%

ORD · 1h 09m · leaves 09:08 5%

Afternoon and evening

IAH · 1h 03m · leaves 14:57 34%

ORD · 49m · leaves 20:14 46%

DFW · 1h 14m · leaves 17:13 59%

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 1597 STL 06:21 → MSP United UA 2232 MSP 11:34 → DEN Connection details →	3h 37m	7h 24m	98%	91%
Southwest WN 3884 STL 08:25 → AUS United UA 1541 AUS 12:55 → DEN Connection details →	2h 30m	6h 49m	95%	91%
Delta DL 1524 STL 06:00 → ATL United UA 1327 ATL 11:10 → DEN Connection details →	2h 32m	7h 28m	99%	88%

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