Seattle/Tacoma International in October 2024

85.5%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 2024, reporting carriers scheduled 13,763 domestic departures from Seattle/Tacoma International (SEA). 85.5% left less than 15 minutes late and 83.2% reached their destination on time; 0.4% were cancelled.

Nationally that month, 85.5% of flights departed on time and 85.8% arrived on time, so SEA departures were level with the national departure figure.

A year earlier, in October 2023, the airport had 14,313 departures with 86.7% leaving on time: a change of −1.2 points, with flights down 4%.

Flights arriving at SEA that month were on time 86.4% of the time (13,756 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 48%, late-arriving aircraft 24% and national aviation system 24%.

On time 83.2%
Arrived 15+ minutes late 16.2%
Cancelled 0.4%
Diverted 0.2%

Every scheduled departure from SEA in October 2024, judged by arrival at the destination.

October 2024 against a year earlier, the airport's year and the nation

Measure	Oct 2024	Oct 2023	SEA, 12 months to Jul 2026	All reported flights, Oct 2024
Departed on time	85.5%	86.7%	78.2%	85.5%
Arrived on time	83.2%	84.9%	78.6%	85.8%
Cancelled	0.4%	0.1%	0.9%	1.0%
Average departure delay (late minutes only)	8.2 min	8.0 min	13.2 min	9.4 min
Scheduled departures a day	459	477	452	20,517
Scheduled departures	13,763	14,313	164,821	615,497

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	6,543	48%	80.0%	2.3 min	0.5%
DL Delta Air Lines	2,733	20%	88.3%	-3.8 min	0.3%
OO SkyWest Airlines	2,102	15%	87.0%	-0.8 min	0.0%
UA United Airlines	799	6%	89.0%	-2.5 min	0.6%
WN Southwest Airlines	654	5%	78.1%	3.5 min	0.3%
AA American Airlines	485	4%	86.0%	-0.3 min	0.2%
F9 Frontier Airlines	148	1%	73.0%	5.5 min	1.4%
NK Spirit Airlines	99	1%	67.7%	12.9 min	1.0%
MQ Envoy Air	81	1%	90.1%	-7.5 min	0.0%
HA Hawaiian Airlines	62	0%	67.7%	16.1 min	0.0%
B6 JetBlue Airways	57	0%	84.2%	-2.4 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SEA–LAX	Seattle to Los Angeles	642	83.6%	0.5 min	0.5%
SEA–SFO	Seattle to San Francisco	611	80.0%	4.2 min	0.5%
SEA–PHX	Seattle to Phoenix	598	84.4%	-0.7 min	0.2%
SEA–LAS	Seattle to Las Vegas	591	78.7%	3.7 min	0.0%
SEA–ANC	Seattle to Anchorage	588	82.0%	-4.8 min	0.7%
SEA–DEN	Seattle to Denver	568	85.4%	-0.3 min	0.2%
SEA–DFW	Seattle to Dallas/Fort Worth	489	80.6%	3.0 min	0.2%
SEA–GEG	Seattle to Spokane	450	82.9%	0.2 min	0.0%
SEA–PDX	Seattle to Portland	440	86.4%	1.5 min	0.2%
SEA–ORD	Seattle to Chicago	435	86.0%	-1.7 min	0.2%
SEA–SJC	Seattle to San Jose	405	80.2%	2.9 min	0.5%
SEA–SAN	Seattle to San Diego	387	74.2%	7.9 min	0.3%

By scheduled departure hour

100

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

Share of departures that left less than 15 minutes late, by scheduled hour (local time), October 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Oct 2024	Minutes
Air carrier	48.0%	42.7%	49,119
Late-arriving aircraft	23.8%	37.4%	24,377
National Aviation System	23.5%	16.3%	24,063
Extreme weather	4.4%	3.4%	4,501
Security	0.2%	0.2%	234

102,294 delay minutes on 2,233 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 2024?

85.5% of 13,763 scheduled domestic departures left less than 15 minutes late, and 83.2% reached their destination on time. The national figures that month were 85.5% and 85.8%.

How does that compare with a year earlier?

In October 2023, 86.7% of 14,313 departures left on time and 0.1% were cancelled, against 85.5% and 0.4% in October 2024.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for October 2024; 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.