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 80-minute layover misses 4% of the time at 11 am and 30% of the time at 6 pm.

Nonstops


American	ORD	MIA	3h 13m	76%	1.9%	3,017	Flying now
United	ORD	MIA	3h 20m	75%	0.7%	1,071	Flying now
Frontier	ORD	MIA	3h 15m	67%	2.2%	46	Not flying now
Spirit	ORD	MIA	3h 16m	61%	6.6%	318	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Miami on time. Total trip = scheduled departure to arrival, layover included (Miami is 1 h ahead of Chicago). Layovers up to 4 hours. Pick a connection for the details.


American Details →	ORD 07:05 → STL 08:31AA 4104 · flown by Envoy	2h 29m St Louis	STL 11:00 → MIA 14:46AA 3954 · flown by Envoy	6h 41m	100%	90%
American Details →	ORD 06:40 → BNA 08:23AA 3973 · flown by Envoy	2h 16m Nashville	BNA 10:39 → MIA 14:00AA 1521	6h 20m	100%	87%
American Details →	ORD 06:00 → BOS 09:34AA 3022	1h 22m Boston	BOS 10:56 → MIA 14:30AA 815	7h 30m	97%	85%
United Details →	ORD 06:29 → IAH 09:18UA 1799	2h 42m Houston	IAH 12:00 → MIA 15:47UA 410	8h 18m	100%	84%
American Details →	ORD 05:07 → CLT 08:10AA 2842	2h 51m Charlotte	CLT 11:01 → MIA 13:11AA 969	7h 03m	97%	84%
American Details →	ORD 14:59 → DTW 17:34AA 3980 · flown by Envoy	1h 23m Detroit	DTW 18:57 → MIA 22:10AA 3358 · flown by Envoy	6h 11m	97%	82%
American Details →	ORD 06:00 → LGA 09:16AA 327	1h 53m New York	LGA 11:09 → MIA 14:21AA 3076	7h 21m	97%	80%
Delta Details →	ORD 05:30 → ATL 08:33DL 1264	2h 27m Atlanta	ATL 11:00 → MIA 13:04DL 1332	6h 34m	98%	78%
Tight connection: often missed
American Details →	ORD 17:07 → PHL 20:25AA 1848	1h 30m Philadelphia	PHL 21:55 → MIA 00:52 +1AA 2936	6h 45m	75%	40%
American Details →	ORD 10:50 → BOS 14:20AA 1563	55m Boston	BOS 15:15 → MIA 18:58AA 1565	7h 08m	52%	35%
American Details →	ORD 16:33 → JFK 20:04AA 1421	56m New York	JFK 21:00 → MIA 00:21 +1AA 2026	6h 48m	52%	24%

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

DEN · 1h 14m · leaves 07:05 6%

CLT · 1h 15m · leaves 05:07 6%

ATL · 1h 19m · leaves 06:35 7%

Afternoon and evening

MSP · 1h 11m · leaves 15:55 30%

ATL · 51m · leaves 13:46 32%

JFK · 56m · leaves 16:33 48%

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.


United UA 1779 ORD 21:41 → BOS American AA 1418 BOS 05:10 → MIA Connection details →	3h 56m	9h 57m	98%	91%
United UA 5958 ORD 07:05 → STL American AA 3954 STL 11:00 → MIA Connection details →	2h 21m	6h 41m	90%	81%
United UA 561 ORD 12:40 → MCI American AA 3939 MCI 17:53 → MIA Connection details →	3h 33m	8h 25m	97%	81%

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