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: Alaska’s SEA → MKE flights land within a few points of 86% on time whatever the hour.

Nonstops (seasonal or thin)


Alaska	SEA	MKE	3h 52m	86%	0.2%	509	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Milwaukee on time. Total trip = scheduled departure to arrival, layover included (Milwaukee is 2 h ahead of Seattle). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	SEA 05:15 → DEN 08:50WN 3615	1h 25m Denver	DEN 10:15 → MKE 13:40WN 1626	6h 25m	96%	94%
Delta Details →	SEA 23:10 → DTW 06:27DL 810	2h 08m Detroit	DTW 08:35 → MKE 08:51 +1DL 3191	7h 41m	98%	89%
Delta Details →	SEA 23:59 → ATL 07:46DL 652	3h 04m Atlanta	ATL 10:50 → MKE 11:51 +1DL 1151	9h 52m	99%	87%
Delta Details →	SEA 21:45 → ATL 05:36DL 567	2h 29m Atlanta	ATL 08:05 → MKE 09:06 +1DL 2999	9h 21m	98%	86%
United Details →	SEA 05:00 → DEN 08:43UA 2601	1h 14m Denver	DEN 09:57 → MKE 13:25UA 1836	6h 25m	99%	85%
Delta Details →	SEA 23:59 → MSP 05:17DL 953	2h 38m Minneapolis	MSP 07:55 → MKE 09:15 +1DL 4466 · flown by SkyWest	7h 16m	100%	83%
Delta Details →	SEA 23:15 → BOS 07:35DL 473	1h 35m Boston	BOS 09:10 → MKE 10:54 +1DL 5614 · flown by Republic	9h 36m	96%	83%
Delta Details →	SEA 09:05 → MSP 14:25DL 536	3h 49m Minneapolis	MSP 18:14 → MKE 19:37DL 4464 · flown by SkyWest	8h 32m	99%	82%
Tight connection: often missed
United Details →	SEA 13:55 → ORD 20:21UA 2101	59m Chicago	ORD 21:20 → MKE 22:29UA 5362 · flown by SkyWest	6h 34m	64%	43%
American Details →	SEA 13:58 → ORD 20:26AA 2520	54m Chicago	ORD 21:20 → MKE 22:23AA 6357 · flown by SkyWest	6h 23m	36%	17%

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 05:00 1%

ORD · 53m · leaves 23:56 11%

IAH · 1h 10m · leaves 23:49 14%

Afternoon and evening

ATL · 1h 15m · leaves 13:35 14%

DFW · 1h 05m · leaves 13:58 23%

ORD · 54m · leaves 13:58 64%

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.


Alaska AS 343 SEA 22:22 → DTW Delta DL 3191 DTW 08:35 → MKE Connection details →	2h 54m	8h 29m	98%	90%
United UA 1505 SEA 08:56 → DEN Southwest WN 1629 DEN 16:20 → MKE Connection details →	3h 35m	8h 49m	97%	89%
Alaska AS 464 SEA 23:31 → ATL Delta DL 1151 ATL 10:50 → MKE Connection details →	3h 26m	10h 20m	100%	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