Sun, Oct 4 has passed, so this is the 12-month record.

Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: Southwest’s DAL → BHM flights land within a few points of 7 in 10 on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	DAL	BHM	1h 35m	71%	1.4%	979	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	DAL 06:05 → ATL 09:15DL 516	2h 00m Atlanta	ATL 11:15 → BHM 11:11DL 1017	5h 06m	96%	83%
Delta Details →	DAL 10:09 → ATL 13:20DL 441	3h 05m Atlanta	ATL 16:25 → BHM 16:19DL 2484	6h 12m	98%	77%
Delta Details →	DAL 15:59 → ATL 19:14DL 512	2h 30m Atlanta	ATL 21:44 → BHM 21:40DL 2257	5h 41m	95%	76%
Delta Details →	DAL 12:19 → ATL 15:31DL 1115	2h 28m Atlanta	ATL 17:59 → BHM 17:55DL 1132	5h 37m	96%	71%
Southwest Details →	DAL 07:05 → BNA 08:50WN 1519	1h 55m Nashville	BNA 10:45 → BHM 11:40WN 434	4h 35m	93%	69%
Southwest Details →	DAL 10:30 → HOU 11:45WN 23	3h 00m Houston	HOU 14:45 → BHM 16:30WN 437	6h 00m	100%	67%
Southwest Details →	DAL 06:00 → DEN 07:00WN 1296	3h 00m Denver	DEN 10:00 → BHM 13:40WN 3193	7h 40m	100%	65%
Southwest Details →	DAL 06:10 → TPA 09:35WN 1415	3h 55m Tampa	TPA 13:30 → BHM 14:00WN 432	7h 50m	100%	65%
Tight connection: often missed
Delta Details →	DAL 15:59 → ATL 19:14DL 512	46m Atlanta	ATL 20:00 → BHM 19:58DL 3202	3h 59m	60%	44%

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.

Afternoon and evening

ATL · 46m · leaves 15:59 40%

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 1261 DAL 06:00 → ATL Delta DL 1017 ATL 11:15 → BHM Connection details →	2h 10m	5h 11m	98%	87%
Southwest WN 1766 DAL 09:30 → ATL Delta DL 2484 ATL 16:25 → BHM Connection details →	3h 50m	6h 51m	100%	78%
Southwest WN 1263 DAL 16:30 → ATL Delta DL 2034 ATL 23:05 → BHM Connection details →	3h 25m	6h 33m	92%	73%

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