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, any airlines

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%
Alaska + Deltatwo ticketsDetails →	SEA 22:22 → DTW 05:41AS 343	2h 54m Detroit	DTW 08:35 → MKE 08:51 +1DL 3191	8h 29m	98%	90%
United + Southwesttwo ticketsDetails →	SEA 08:56 → DEN 12:45UA 1505	3h 35m Denver	DEN 16:20 → MKE 19:45WN 1629	8h 49m	97%	89%
Alaska + Deltatwo ticketsDetails →	SEA 23:31 → ATL 07:24AS 464	3h 26m Atlanta	ATL 10:50 → MKE 11:51 +1DL 1151	10h 20m	100%	87%
Southwest + Unitedtwo ticketsDetails →	SEA 07:50 → DEN 11:25WN 3397	2h 05m Denver	DEN 13:30 → MKE 17:04UA 4802 · flown by SkyWest	7h 14m	98%	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%
Alaska + Southwesttwo ticketsDetails →	SEA 23:15 → BNA 05:40AS 382	2h 30m Nashville	BNA 08:10 → MKE 09:45 +1WN 585	8h 30m	97%	86%
United Details →	SEA 05:00 → DEN 08:43UA 2601	1h 14m Denver	DEN 09:57 → MKE 13:25UA 1836	6h 25m	99%	85%
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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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