How often are SEA to ATL flights on time?

Flights from Seattle (SEA) to Atlanta (ATL) arrive on time 88% of the time across 20,540 flights of official data.

Which airline is most reliable on the SEA to ATL route?

Delta Air Lines has the best on-time record on this route at 89% across 14,907 flights.

Route reliability

Flights from Seattle to Atlanta arrive on time 88% of the time across 20,540 flights. Here’s how each airline really performs.

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On-time rate

20,540 flights

Airline	On-time	Flights
Delta Air Lines	89%	14,907
Alaska Airlines	86%	5,633

On-time = arrived within 15 minutes of schedule, per BTS TranStats. Compare the reverse leg ATL → SEA.

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Score real SEA–ATL flights on reliability, weather, and connection safety — not just price.

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