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 1 time in 10 at 11 am and 42% of the time at 4 pm.

Nonstops


United	DEN	BHM	3h 00m	80%	0.3%	727	Flying now
Southwest	DEN	BHM	2h 35m	67%	0.6%	491	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 (Birmingham is 1 h ahead of Denver). Layovers up to 4 hours. Pick a connection for the details.


United Details →	DEN 07:42 → IAH 11:15UA 1720	3h 10m Houston	IAH 14:25 → BHM 16:20UA 6120 · flown by Mesa	7h 38m	100%	90%
Delta Details →	DEN 00:40 → ATL 05:42DL 302	2h 43m Atlanta	ATL 08:25 → BHM 08:21DL 3100	6h 41m	99%	90%
American Details →	DEN 23:59 → CLT 05:13AA 3156	1h 52m Charlotte	CLT 07:05 → BHM 07:46 +1AA 2349	6h 47m	96%	88%
Delta Details →	DEN 05:45 → ATL 10:42DL 341	2h 48m Atlanta	ATL 13:30 → BHM 13:24DL 3012	6h 39m	99%	86%
United Details →	DEN 05:00 → IAH 08:32UA 320	3h 38m Houston	IAH 12:10 → BHM 14:09UA 4263 · flown by CommuteAir	8h 09m	100%	84%
American Details →	DEN 05:00 → DFW 08:05AA 2612	1h 45m Dallas-Fort Worth	DFW 09:50 → BHM 11:46AA 3469 · flown by Envoy	5h 46m	97%	83%
Southwest Details →	DEN 23:55 → MCO 05:40WN 1597	2h 20m Orlando	MCO 08:00 → BHM 08:40 +1WN 436	7h 45m	100%	83%
Delta Details →	DEN 00:59 → DTW 05:48DL 1096	2h 47m Detroit	DTW 08:35 → BHM 09:42DL 3685 · flown by SkyWest	7h 43m	97%	81%
Tight connection: often missed
Southwest Details →	DEN 10:15 → HOU 13:55WN 1543	50m Houston	HOU 14:45 → BHM 16:30WN 437	5h 15m	65%	45%
American Details →	DEN 15:13 → PHL 20:59AA 1759	1h 06m Philadelphia	PHL 22:05 → BHM 23:40AA 5402 · flown by PSA	7h 27m	61%	43%
American Details →	DEN 12:39 → DFW 15:46AA 2359	53m Dallas-Fort Worth	DFW 16:39 → BHM 18:35AA 3417 · flown by Envoy	4h 56m	58%	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

ORD · 1h 14m · leaves 07:05 8%

IAH · 55m · leaves 07:42 10%

Afternoon and evening

DFW · 53m · leaves 12:39 42%

DAL · 1h 15m · leaves 15:55 42%

CLT · 1h 01m · leaves 15:57 45%

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.


Frontier F9 3206 DEN 07:00 → IAH United UA 6120 IAH 14:25 → BHM Connection details →	3h 43m	8h 20m	99%	90%
Frontier F9 1450 DEN 23:46 → ATL Delta DL 3100 ATL 08:25 → BHM Connection details →	3h 23m	7h 35m	97%	86%
United UA 1377 DEN 06:00 → ORD American AA 3971 ORD 13:01 → BHM Connection details →	3h 19m	8h 01m	98%	82%

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