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 3% of the time at 11 am and 13% of the time at 8 pm.

Nonstops


United	BHM	DEN	3h 18m	87%	0.3%	727	Flying now
Southwest	BHM	DEN	3h 00m	78%	0.0%	491	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 Birmingham). Layovers up to 4 hours. Pick a connection for the details.


United Details →	BHM 07:18 → ORD 09:41UA 4449 · flown by GoJet	1h 13m Chicago	ORD 10:54 → DEN 12:45UA 581	6h 27m	92%	88%
Delta Details →	BHM 07:28 → ATL 09:32DL 1369	3h 18m Atlanta	ATL 12:50 → DEN 14:04DL 957	7h 36m	97%	85%
Delta Details →	BHM 06:15 → ATL 08:21DL 1618	3h 24m Atlanta	ATL 11:45 → DEN 12:59DL 706	7h 44m	99%	84%
Delta Details →	BHM 06:25 → DTW 09:27DL 3006	3h 15m Detroit	DTW 12:42 → DEN 13:54DL 1648	8h 29m	99%	82%
Delta Details →	BHM 05:15 → ATL 07:21DL 1979	2h 29m Atlanta	ATL 09:50 → DEN 11:07DL 995	6h 52m	99%	82%
Delta Details →	BHM 09:28 → ATL 11:29DL 3100	2h 21m Atlanta	ATL 13:50 → DEN 15:00DL 530	6h 32m	99%	78%
United Details →	BHM 06:30 → IAH 08:30UA 4008 · flown by Mesa	2h 01m Houston	IAH 10:31 → DEN 12:07UA 1409	6h 37m	97%	78%
United Details →	BHM 11:20 → IAH 13:26UA 4822 · flown by CommuteAir	2h 55m Houston	IAH 16:21 → DEN 18:23UA 484	8h 03m	97%	77%
Tight connection: often missed
American Details →	BHM 16:49 → DFW 19:00AA 5329 · flown by PSA	1h 29m Dallas-Fort Worth	DFW 20:29 → DEN 21:32AA 577	5h 43m	70%	33%
American Details →	BHM 14:45 → CLT 17:29AA 5075 · flown by PSA	1h 03m Charlotte	CLT 18:32 → DEN 20:17AA 1736	6h 32m	63%	29%
American Details →	BHM 15:12 → DFW 17:24AA 5063 · flown by PSA	1h 06m Dallas-Fort Worth	DFW 18:30 → DEN 19:41AA 2235	5h 29m	49%	21%

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 13m · leaves 07:18 8%

IAH · 1h 02m · leaves 06:30 14%

Afternoon and evening

CLT · 1h 03m · leaves 14:45 37%

DFW · 1h 06m · leaves 15:12 51%

MCO · 50m · leaves 17:20 60%

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 440 BHM 06:50 → MCO United UA 1520 MCO 12:50 → DEN Connection details →	3h 25m	9h 01m	100%	93%
Delta DL 1979 BHM 05:15 → ATL United UA 1327 ATL 11:10 → DEN Connection details →	3h 49m	8h 13m	100%	90%
Southwest WN 430 BHM 05:30 → BNA United UA 502 BNA 10:26 → DEN Connection details →	3h 56m	7h 53m	98%	87%

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