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 75-minute layover misses 4% of the time at 10 am and 1 time in 3 at 8 pm.

Nonstops


American	MIA	SEA	6h 36m	70%	0.4%	454	Flying now
Alaska	MIA	SEA	6h 44m	69%	1.3%	392	Flying now
Delta	MIA	SEA	6h 44m	63%	1.6%	366	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Seattle on time. Total trip = scheduled departure to arrival, layover included (Seattle is 3 h behind Miami). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	MIA 06:35 → MSP 09:25DL 1056	1h 45m Minneapolis	MSP 11:10 → SEA 12:58DL 889	9h 23m	97%	83%
Delta Details →	MIA 06:00 → ATL 08:05DL 1249	3h 05m Atlanta	ATL 11:10 → SEA 13:38DL 648	10h 38m	99%	83%
United Details →	MIA 07:37 → DEN 10:00UA 2045	4h 00m Denver	DEN 14:00 → SEA 16:00UA 2164	11h 23m	99%	83%
Delta Details →	MIA 07:00 → SLC 10:04DL 2021	3h 16m Salt Lake City	SLC 13:20 → SEA 14:40DL 2921	10h 40m	98%	82%
American Details →	MIA 07:35 → PHX 09:19AA 1061	2h 13m Phoenix	PHX 11:32 → SEA 14:49AA 3440 · flown by Envoy	10h 11m	96%	81%
Delta Details →	MIA 08:17 → ATL 10:20DL 1261	2h 15m Atlanta	ATL 12:35 → SEA 14:55DL 629	9h 38m	99%	80%
United Details →	MIA 06:30 → IAH 08:24UA 2074	1h 36m Houston	IAH 10:00 → SEA 12:47UA 2205	9h 17m	100%	77%
Frontier Details →	MIA 06:00 → DEN 08:37F9 1279	3h 23m Denver	DEN 12:00 → SEA 14:01F9 1175	11h 04m	97%	76%
Tight connection: often missed
Delta Details →	MIA 18:05 → ATL 20:22DL 1386	1h 13m Atlanta	ATL 21:35 → SEA 23:59DL 903	8h 54m	68%	52%
United Details →	MIA 15:44 → DEN 18:23UA 2852	47m Denver	DEN 19:10 → SEA 21:10UA 360	8h 26m	69%	47%
American Details →	MIA 19:30 → DFW 21:45AA 3104	56m Dallas-Fort Worth	DFW 22:41 → SEA 00:57 +1AA 1487	8h 27m	53%	23%

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

LAX · 1h 16m · leaves 07:07 4%

SFO · 1h 07m · leaves 08:00 7%

EWR · 54m · leaves 07:07 10%

Afternoon and evening

DFW · 56m · leaves 19:30 47%

SFO · 1h 18m · leaves 18:35 51%

DEN · 1h 10m · leaves 16:20 65%

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.


American AA 713 MIA 07:07 → LAX United UA 325 LAX 11:43 → SEA Connection details →	2h 09m	10h 29m	97%	87%
American AA 1061 MIA 07:35 → PHX Delta DL 2419 PHX 12:05 → SEA Connection details →	2h 46m	10h 43m	94%	86%
American AA 2010 MIA 09:25 → LAS Delta DL 2905 LAS 13:35 → SEA Connection details →	1h 54m	9h 58m	97%	86%

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