Seattle/Tacoma International in October 2025

81.4%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In October 2025, reporting carriers scheduled 13,859 domestic departures from Seattle/Tacoma International (SEA). 81.4% left less than 15 minutes late and 81.8% reached their destination on time; 1.2% were cancelled.

Nationally that month, 80.0% of flights departed on time and 79.1% arrived on time, so SEA departures were 1.4 points above the national departure figure.

A year earlier, in October 2024, the airport had 13,763 departures with 85.5% leaving on time: a change of −4.1 points, with flights up 1%.

Flights arriving at SEA that month were on time 80.5% of the time (13,857 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 50%, late-arriving aircraft 26% and national aviation system 21%.

On time 81.8%
Arrived 15+ minutes late 16.9%
Cancelled 1.2%
Diverted 0.2%

Every scheduled departure from SEA in October 2025, judged by arrival at the destination.

October 2025 against a year earlier, the airport's year and the nation

Measure	Oct 2025	Oct 2024	SEA, 12 months to Jul 2026	All reported flights, Oct 2025
Departed on time	81.4%	85.5%	78.2%	80.0%
Arrived on time	81.8%	83.2%	78.6%	79.1%
Cancelled	1.2%	0.4%	0.9%	0.5%
Average departure delay (late minutes only)	11.5 min	8.2 min	13.2 min	13.9 min
Scheduled departures a day	462	459	452	20,195
Scheduled departures	13,859	13,763	164,821	605,844

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	6,181	45%	77.9%	2.3 min	2.2%
DL Delta Air Lines	2,780	20%	83.5%	1.4 min	0.4%
OO SkyWest Airlines	2,532	18%	89.3%	-3.9 min	0.2%
UA United Airlines	796	6%	86.8%	-2.6 min	0.3%
WN Southwest Airlines	626	5%	74.3%	7.2 min	0.2%
AA American Airlines	573	4%	86.0%	-5.2 min	0.2%
HA Hawaiian Airlines	155	1%	76.1%	22.6 min	1.3%
F9 Frontier Airlines	121	1%	78.5%	25.0 min	2.5%
B6 JetBlue Airways	50	0%	86.0%	11.2 min	0.0%
MQ Envoy Air	45	0%	82.2%	4.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SEA–LAX	Seattle to Los Angeles	614	85.0%	-0.3 min	1.3%
SEA–PHX	Seattle to Phoenix	599	79.0%	4.8 min	0.5%
SEA–SFO	Seattle to San Francisco	584	72.1%	9.4 min	1.2%
SEA–DEN	Seattle to Denver	557	82.6%	-0.3 min	0.7%
SEA–ANC	Seattle to Anchorage	553	75.4%	5.3 min	1.6%
SEA–ORD	Seattle to Chicago	496	80.2%	1.4 min	0.6%
SEA–LAS	Seattle to Las Vegas	487	74.3%	14.0 min	2.5%
SEA–GEG	Seattle to Spokane	451	88.2%	-2.6 min	0.9%
SEA–DFW	Seattle to Dallas/Fort Worth	442	81.4%	0.7 min	0.7%
SEA–PDX	Seattle to Portland	428	87.4%	-4.3 min	0.7%
SEA–SJC	Seattle to San Jose	392	83.7%	-1.4 min	1.0%
SEA–SMF	Seattle to Sacramento	375	84.3%	-1.3 min	0.8%

By scheduled departure hour

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), October 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Oct 2025	Minutes
Air carrier	50.0%	34.0%	67,560
Late-arriving aircraft	25.5%	39.7%	34,499
National Aviation System	20.9%	22.9%	28,196
Extreme weather	3.6%	3.3%	4,806
Security	0.1%	0.1%	121

135,182 delay minutes on 2,338 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left SEA on time in October 2025?

81.4% of 13,859 scheduled domestic departures left less than 15 minutes late, and 81.8% reached their destination on time. The national figures that month were 80.0% and 79.1%.

How does that compare with a year earlier?

In October 2024, 85.5% of 13,763 departures left on time and 0.4% were cancelled, against 81.4% and 1.2% in October 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for October 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for SEA · methodology · corrections.