Seattle/Tacoma International in October 2023

86.7%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 2023, reporting carriers scheduled 14,313 domestic departures from Seattle/Tacoma International (SEA). 86.7% left less than 15 minutes late and 84.9% reached their destination on time; 0.1% were cancelled.

Nationally that month, 83.8% of flights departed on time and 84.0% arrived on time, so SEA departures were 2.9 points above the national departure figure.

Flights arriving at SEA that month were on time 86.7% of the time (14,309 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 50%, late-arriving aircraft 25% and national aviation system 22%.

On time 84.9%
Arrived 15+ minutes late 14.8%
Cancelled 0.1%
Diverted 0.2%

Every scheduled departure from SEA in October 2023, judged by arrival at the destination.

October 2023 against a year earlier, the airport's year and the nation

Measure	Oct 2023	Year earlier	SEA, 12 months to Jul 2026	All reported flights, Oct 2023
Departed on time	86.7%	—	78.2%	83.8%
Arrived on time	84.9%	—	78.6%	84.0%
Cancelled	0.1%	—	0.9%	0.4%
Average departure delay (late minutes only)	8.0 min	—	13.2 min	11.0 min
Scheduled departures a day	477	—	452	19,966
Scheduled departures	14,313	—	164,821	598,968

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	6,763	47%	82.8%	0.8 min	0.0%
DL Delta Air Lines	2,848	20%	89.0%	-4.8 min	0.1%
OO SkyWest Airlines	2,272	16%	90.0%	-2.3 min	0.0%
UA United Airlines	771	5%	86.4%	0.6 min	0.1%
WN Southwest Airlines	703	5%	82.1%	2.1 min	0.0%
AA American Airlines	535	4%	83.6%	5.3 min	1.1%
F9 Frontier Airlines	126	1%	62.7%	15.9 min	0.8%
B6 JetBlue Airways	118	1%	67.8%	45.9 min	0.0%
NK Spirit Airlines	83	1%	80.7%	9.4 min	0.0%
HA Hawaiian Airlines	63	0%	57.1%	31.3 min	1.6%
MQ Envoy Air	31	0%	77.4%	9.7 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SEA–LAX	Seattle to Los Angeles	699	82.7%	2.8 min	0.0%
SEA–LAS	Seattle to Las Vegas	615	80.7%	4.4 min	0.2%
SEA–PHX	Seattle to Phoenix	612	80.9%	5.9 min	0.2%
SEA–ANC	Seattle to Anchorage	602	87.7%	-6.4 min	0.0%
SEA–PDX	Seattle to Portland	590	87.5%	-1.2 min	0.0%
SEA–DEN	Seattle to Denver	581	82.8%	1.5 min	0.2%
SEA–SFO	Seattle to San Francisco	515	83.3%	0.7 min	0.0%
SEA–GEG	Seattle to Spokane	464	88.1%	-1.1 min	0.0%
SEA–ORD	Seattle to Chicago	432	87.3%	-0.7 min	0.0%
SEA–BOI	Seattle to Boise	425	91.1%	-1.8 min	0.0%
SEA–DFW	Seattle to Dallas/Fort Worth	421	78.4%	7.0 min	1.4%
SEA–SNA	Seattle to Santa Ana	397	90.2%	-5.9 min	0.0%

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 2023.

Delay causes

BTS cause category	Share of delay minutes	National, Oct 2023	Minutes
Air carrier	50.2%	41.3%	51,983
Late-arriving aircraft	25.4%	40.5%	26,312
National Aviation System	21.6%	14.4%	22,353
Extreme weather	2.4%	3.7%	2,452
Security	0.5%	0.2%	499

103,599 delay minutes on 2,118 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 2023?

86.7% of 14,313 scheduled domestic departures left less than 15 minutes late, and 84.9% reached their destination on time. The national figures that month were 83.8% and 84.0%.

How does that compare with a year earlier?

October 2022 is outside the 36 months on file, or the airport had too few reported flights that month.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for October 2023; 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.