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 1 time in 10 at 10 am and 2 times in 5 at 10 pm.

Nonstops (seasonal or thin)


Alaska	CMH	SEA	5h 08m	73%	1.1%	460	Flying now
Delta	CMH	SEA	–	100%few flights	0.0%	1	Not flying now
American	CMH	SEA	–	100%few flights	0.0%	1	Not flying now
United	CMH	SEA	–	100%few flights	0.0%	1	Not flying now
Southwest	CMH	SEA	–	0%few flights	0.0%	1	Not 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 3 h behind Columbus). Layovers up to 4 hours. Pick a connection for the details.


United Details →	CMH 07:15 → LAX 09:06UA 354	2h 37m Los Angeles	LAX 11:43 → SEA 14:36UA 325	10h 21m	97%	86%
Delta Details →	CMH 07:30 → SLC 09:29DL 2142	2h 06m Salt Lake City	SLC 11:35 → SEA 12:52DL 2995	8h 22m	97%	85%
Delta Details →	CMH 07:00 → MSP 08:03DL 2403	3h 07m Minneapolis	MSP 11:10 → SEA 12:58DL 889	8h 58m	99%	84%
Delta Details →	CMH 07:05 → ATL 08:42DL 2909	2h 28m Atlanta	ATL 11:10 → SEA 13:38DL 648	9h 33m	98%	84%
United Details →	CMH 11:03 → ORD 11:39UA 622	1h 51m Chicago	ORD 13:30 → SEA 16:09UA 1660	8h 06m	99%	83%
United Details →	CMH 09:00 → DEN 10:14UA 728	3h 46m Denver	DEN 14:00 → SEA 16:00UA 2164	10h 00m	98%	81%
United Details →	CMH 05:30 → ORD 06:09UA 3524 · flown by Republic	2h 36m Chicago	ORD 08:45 → SEA 11:38UA 2099	9h 08m	99%	81%
American Details →	CMH 07:58 → PHX 09:09AA 1958	2h 23m Phoenix	PHX 11:32 → SEA 14:49AA 3440 · flown by Envoy	9h 48m	96%	80%
Tight connection: often missed
Delta Details →	CMH 18:37 → ATL 20:34DL 2280	1h 01m Atlanta	ATL 21:35 → SEA 23:59DL 903	8h 22m	71%	56%
American Details →	CMH 17:26 → CLT 19:12AA 5117 · flown by PSA	1h 07m Charlotte	CLT 20:19 → SEA 22:59AA 1674	8h 34m	73%	44%
American Details →	CMH 20:05 → DFW 21:48AA 2337	53m Dallas-Fort Worth	DFW 22:41 → SEA 00:57 +1AA 1487	7h 52m	60%	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

MSP · 1h 02m · leaves 07:00 4%

DEN · 55m · leaves 05:45 5%

ATL · 1h 10m · leaves 07:05 5%

Afternoon and evening

CLT · 1h 07m · leaves 17:26 27%

ATL · 1h 01m · leaves 18:37 29%

DFW · 53m · leaves 20:05 40%

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.


Southwest WN 1191 CMH 06:45 → LAS Delta DL 2922 LAS 10:59 → SEA Connection details →	2h 59m	10h 06m	100%	89%
American AA 1958 CMH 07:58 → PHX Delta DL 2419 PHX 12:05 → SEA Connection details →	2h 56m	10h 20m	95%	87%
Delta DL 2142 CMH 07:30 → SLC Alaska AS 664 SLC 12:51 → SEA Connection details →	3h 22m	9h 34m	98%	86%

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