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 90-minute layover misses 5% of the time at 8 am and 16% of the time at 5 pm.

Nonstops


Delta	ATL	STL	1h 42m	85%	2.0%	2,357	Flying now
Southwest	ATL	STL	1h 45m	80%	0.4%	1,105	Flying now
Frontier	ATL	STL	1h 50m	69%	1.8%	223	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 behind Atlanta). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	ATL 06:25 → DEN 07:30WN 2114	2h 35m Denver	DEN 10:05 → STL 13:20WN 1753	7h 55m	100%	96%
Southwest Details →	ATL 10:55 → MCI 12:00WN 3931	1h 45m Kansas City	MCI 13:45 → STL 14:50WN 2083	4h 55m	100%	88%
American Details →	ATL 05:20 → MIA 07:15AA 1135	1h 08m Miami	MIA 08:23 → STL 10:24AA 3954 · flown by Envoy	6h 04m	88%	83%
Frontier Details →	ATL 10:54 → DFW 12:29F9 3021	3h 52m Dallas-Fort Worth	DFW 16:21 → STL 18:18F9 1524	8h 24m	99%	82%
United Details →	ATL 11:37 → IAH 12:47UA 425	2h 44m Houston	IAH 15:31 → STL 17:42UA 6160 · flown by Mesa	7h 05m	98%	82%
United Details →	ATL 06:07 → EWR 08:25UA 299	1h 28m Newark	EWR 09:53 → STL 11:41UA 3630 · flown by Republic	6h 34m	95%	82%
Frontier Details →	ATL 12:33 → DEN 14:00F9 3293	2h 10m Denver	DEN 16:10 → STL 19:23F9 3302	7h 49m	96%	81%
Southwest Details →	ATL 07:05 → TPA 08:30WN 244	1h 45m Tampa	TPA 10:15 → STL 11:40WN 4049	5h 30m	100%	81%
Tight connection: often missed
Delta Details →	ATL 17:55 → SLC 19:58DL 653	52m Salt Lake City	SLC 20:50 → STL 00:43 +1DL 2666	7h 48m	71%	58%
Delta Details →	ATL 17:10 → DTW 19:11DL 2067	49m Detroit	DTW 20:00 → STL 20:39DL 1541	4h 29m	60%	46%
American Details →	ATL 19:43 → ORD 21:11AA 1372	1h 49m Chicago	ORD 23:00 → STL 00:16 +1AA 1004	5h 33m	65%	34%

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

LGA · 1h 09m · leaves 09:24 6%

DTW · 1h 18m · leaves 09:18 7%

PHL · 49m · leaves 06:00 10%

Afternoon and evening

DEN · 1h 05m · leaves 18:20 49%

MDW · 1h 05m · leaves 19:35 64%

DFW · 47m · leaves 17:34 66%

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.


Southwest WN 202 ATL 09:30 → DEN United UA 1639 DEN 13:25 → STL Connection details →	2h 45m	8h 03m	100%	87%
Southwest WN 2114 ATL 06:25 → DEN United UA 652 DEN 09:35 → STL Connection details →	2h 05m	7h 17m	100%	84%
Delta DL 1178 ATL 07:25 → ORD American AA 3815 ORD 12:32 → STL Connection details →	3h 57m	7h 30m	100%	83%

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