Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: airlines and hours on this route all land within a few points of 82% on time.

Nonstops (seasonal or thin)


Alaska	SEA	CMH	4h 30m	82%	0.4%	460	Flying now
Southwest	SEA	CMH	–	100%few flights	0.0%	1	Not flying now
United	SEA	CMH	–	100%few flights	0.0%	1	Not flying now
American	SEA	CMH	–	100%few flights	0.0%	1	Not flying now
Delta	SEA	CMH	–	100%few flights	0.0%	1	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	SEA 23:10 → DTW 06:27DL 810	3h 48m Detroit	DTW 10:15 → CMH 11:27 +1DL 5810 · flown by Republic	9h 17m	99%	92%
Southwest Details →	SEA 23:05 → MDW 05:00WN 2304	2h 45m Chicago	MDW 07:45 → CMH 10:05 +1WN 4093	8h 00m	98%	91%
Delta Details →	SEA 23:59 → MSP 05:17DL 953	1h 48m Minneapolis	MSP 07:05 → CMH 10:03 +1DL 2772	7h 04m	98%	91%
United Details →	SEA 23:11 → ORD 05:18UA 747	2h 02m Chicago	ORD 07:20 → CMH 09:57 +1UA 2779	7h 46m	95%	87%
Delta Details →	SEA 23:59 → ATL 07:46DL 652	2h 24m Atlanta	ATL 10:10 → CMH 11:48 +1DL 1522	8h 49m	99%	87%
Delta Details →	SEA 21:45 → ATL 05:36DL 567	1h 54m Atlanta	ATL 07:30 → CMH 09:02 +1DL 1479	8h 20m	98%	85%
United Details →	SEA 23:00 → EWR 07:18UA 1274	3h 20m Newark	EWR 10:38 → CMH 12:33 +1UA 3638 · flown by Republic	10h 33m	98%	84%
American Details →	SEA 21:35 → CLT 05:41AA 2793	3h 18m Charlotte	CLT 08:59 → CMH 10:25 +1AA 2395	9h 50m	100%	84%
Tight connection: often missed
Delta Details →	SEA 08:40 → ATL 16:33DL 797	52m Atlanta	ATL 17:25 → CMH 19:03DL 2786	7h 23m	63%	45%
Delta Details →	SEA 11:40 → JFK 20:25DL 415	50m New York	JFK 21:15 → CMH 23:28DL 5658 · flown by Republic	8h 49m	62%	42%
Southwest Details →	SEA 11:45 → MDW 18:00WN 3081	52m Chicago	MDW 18:52 → CMH 21:02WN 4043	6h 22m	41%	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

ORD · 58m · leaves 23:56 6%

DEN · 52m · leaves 05:00 8%

IAD · 1h 03m · leaves 23:20 9%

Afternoon and evening

ATL · 52m · leaves 08:40 37%

JFK · 50m · leaves 11:40 38%

MDW · 52m · leaves 11:45 59%

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 394 SEA 21:33 → MCO Southwest WN 1187 MCO 10:00 → CMH Connection details →	3h 44m	11h 42m	100%	87%
Alaska AS 314 SEA 22:40 → EWR United UA 3638 EWR 10:38 → CMH Connection details →	3h 39m	10h 53m	99%	87%
Alaska AS 1385 SEA 16:36 → SFO United UA 1939 SFO 21:23 → CMH Connection details →	2h 35m	9h 39m	97%	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