Sun, Oct 4 has passed, so this is the 12-month record.

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 3 in 4 on time.

Nonstops (seasonal or thin)


Delta	TPA	SEA	6h 05m	88%	0.8%	363	Flying now
Alaska	TPA	SEA	6h 05m	69%	1.0%	612	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 Tampa). Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	TPA 08:45 → ATL 10:20DL 744	50m Atlanta	ATL 11:10 → SEA 13:38DL 648	7h 53m	86%	74%
Delta Details →	TPA 05:15 → ATL 06:48DL 2330	52m Atlanta	ATL 07:40 → SEA 10:00DL 444	7h 45m	94%	73%
Southwest Details →	TPA 05:15 → DEN 06:55WN 4018	50m Denver	DEN 07:45 → SEA 09:45WN 1713	7h 30m	81%	68%
JetBlue Details →	TPA 20:33 → BOS 15:27B6 392	3h 57m Boston	BOS 19:24 → SEA 22:49B6 197	5h 16m	99%	53%
Tight connection: often missed
United Details →	TPA 16:20 → DEN 18:20UA 1773	50m Denver	DEN 19:10 → SEA 21:10UA 360	7h 50m	58%	40%
Southwest Details →	TPA 14:12 → BNA 15:08WN 4004	47m Nashville	BNA 15:55 → SEA 18:50WN 4784	7h 38m	51%	14%

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

ATL · 52m · leaves 05:15 6%

DEN · 50m · leaves 05:15 19%

Afternoon and evening

DEN · 50m · leaves 16:20 42%

BNA · 47m · leaves 14:12 49%

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.


JetBlue B6 392 TPA 20:33 → BOS Delta DL 324 BOS 19:25 → SEA Connection details →	3h 58m	5h 17m	98%	61%

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