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 one-hour layover misses 17% of the time at 5 am and 36% of the time at 6 pm.

Nonstops


Delta	SEA	DTW	4h 18m	87%	1.0%	1,517	Flying now
Alaska	SEA	DTW	4h 19m	84%	0.2%	543	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	SEA 15:33 → SFO 17:47UA 2866	3h 43m San Francisco	SFO 21:30 → DTW 05:20 +1UA 234	10h 47m	96%	96%
Delta Details →	SEA 05:30 → SLC 08:30DL 1128	1h 15m Salt Lake City	SLC 09:45 → DTW 15:14DL 2236	6h 44m	97%	90%
United Details →	SEA 23:11 → ORD 05:18UA 747	2h 02m Chicago	ORD 07:20 → DTW 09:52 +1UA 1344	7h 41m	95%	90%
United Details →	SEA 23:49 → IAH 06:10UA 2379	3h 35m Houston	IAH 09:45 → DTW 13:42 +1UA 4064 · flown by Mesa	10h 53m	100%	89%
Delta Details →	SEA 23:59 → MSP 05:17DL 953	3h 43m Minneapolis	MSP 09:00 → DTW 11:43 +1DL 1433	8h 44m	100%	88%
Delta Details →	SEA 21:45 → ATL 05:36DL 567	1h 49m Atlanta	ATL 07:25 → DTW 09:20 +1DL 1646	8h 35m	97%	88%
Delta Details →	SEA 06:05 → MSP 11:24DL 943	1h 31m Minneapolis	MSP 12:55 → DTW 15:38DL 1519	6h 33m	97%	87%
United Details →	SEA 05:00 → DEN 08:43UA 2601	52m Denver	DEN 09:35 → DTW 14:27UA 1915	6h 27m	92%	87%
Tight connection: often missed
Delta Details →	SEA 11:56 → ATL 19:54DL 554	57m Atlanta	ATL 20:51 → DTW 22:54DL 1232	7h 58m	75%	50%
American Details →	SEA 11:40 → DFW 17:50AA 767	57m Dallas-Fort Worth	DFW 18:47 → DTW 22:36AA 3108	7h 56m	64%	32%
Southwest Details →	SEA 11:45 → MDW 18:00WN 3081	50m Chicago	MDW 18:50 → DTW 21:00WN 4200	6h 17m	36%	18%

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

PDX · 1h 16m · leaves 09:30 3%

SLC · 1h 15m · leaves 05:30 3%

MCO · 1h 18m · leaves 23:15 5%

Afternoon and evening

DFW · 57m · leaves 11:40 36%

ORD · 59m · leaves 13:55 36%

MDW · 50m · leaves 11:45 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 1385 SEA 16:36 → SFO United UA 234 SFO 21:30 → DTW Connection details →	2h 42m	9h 44m	97%	96%
Alaska AS 280 SEA 22:12 → CMH Delta DL 5812 CMH 08:04 → DTW Connection details →	2h 24m	8h 03m	99%	94%
Alaska AS 639 SEA 21:18 → TPA Delta DL 808 TPA 08:30 → DTW Connection details →	2h 42m	10h 52m	97%	89%

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