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 70-minute layover misses 1% of the time at 7 am and 38% of the time at 6 pm.

Nonstops


United	ORD	SEA	4h 41m	77%	0.7%	1,504	Flying now
Delta	ORD	SEA	4h 40m	68%	1.4%	907	Flying now
Alaska	ORD	SEA	4h 40m	68%	1.9%	1,796	Flying now
American	ORD	SEA	4h 44m	65%	1.9%	1,351	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 2 h behind Chicago). Layovers up to 4 hours. Pick a connection for the details.


United Details →	ORD 05:00 → DEN 06:42UA 2666	1h 19m Denver	DEN 08:01 → SEA 10:00UA 2271	7h 00m	99%	89%
United Details →	ORD 06:00 → LAX 08:27UA 2373	3h 16m Los Angeles	LAX 11:43 → SEA 14:36UA 325	10h 36m	100%	89%
United Details →	ORD 06:30 → IAD 09:24UA 1689	3h 46m Dulles	IAD 13:10 → SEA 15:55UA 2241	11h 25m	100%	85%
United Details →	ORD 06:00 → DEN 07:42UA 2806	3h 40m Denver	DEN 11:22 → SEA 13:22UA 1424	9h 22m	100%	84%
Delta Details →	ORD 05:30 → ATL 08:33DL 1264	2h 37m Atlanta	ATL 11:10 → SEA 13:38DL 648	10h 08m	98%	84%
United Details →	ORD 08:40 → DEN 10:31UA 526	3h 29m Denver	DEN 14:00 → SEA 16:00UA 2164	9h 20m	100%	84%
Delta Details →	ORD 07:35 → LAX 10:01DL 1556	1h 58m Los Angeles	LAX 11:59 → SEA 14:54DL 1045	9h 19m	95%	83%
Delta Details →	ORD 06:30 → MSP 08:06DL 1717	3h 04m Minneapolis	MSP 11:10 → SEA 12:58DL 889	8h 28m	97%	83%
Tight connection: often missed
Delta Details →	ORD 15:55 → MSP 17:40DL 1533	1h 15m Minneapolis	MSP 18:55 → SEA 20:48DL 881	6h 53m	72%	52%
American Details →	ORD 14:25 → PHX 16:09AA 1384	1h 46m Phoenix	PHX 17:55 → SEA 21:05AA 4307 · flown by Envoy	8h 40m	56%	47%
American Details →	ORD 13:25 → DFW 15:59AA 1120	56m Dallas-Fort Worth	DFW 16:55 → SEA 19:15AA 2009	7h 48m	46%	25%

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 19m · leaves 05:00 1%

IAD · 1h 18m · leaves 08:40 4%

ATL · 1h 19m · leaves 05:30 7%

Afternoon and evening

LAX · 47m · leaves 15:47 38%

DEN · 48m · leaves 18:17 53%

DFW · 56m · leaves 13:25 54%

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 1994 ORD 09:00 → PDX Delta DL 4062 PDX 15:26 → SEA Connection details →	3h 48m	9h 41m	99%	88%
American AA 769 ORD 07:25 → PHX Delta DL 2419 PHX 12:05 → SEA Connection details →	2h 56m	9h 53m	96%	87%
United UA 1304 ORD 08:40 → SNA Alaska AS 760 SNA 14:45 → SEA Connection details →	3h 24m	10h 52m	99%	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