Seattle/Tacoma International in January 2025

82.3%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 January 2025, reporting carriers scheduled 11,882 domestic departures from Seattle/Tacoma International (SEA). 82.3% left less than 15 minutes late and 82.9% reached their destination on time; 0.9% were cancelled.

Nationally that month, 79.3% of flights departed on time and 78.6% arrived on time, so SEA departures were 3.0 points above the national departure figure.

A year earlier, in January 2024, the airport had 11,751 departures with 67.9% leaving on time: a change of +14.4 points, with flights up 1%.

Flights arriving at SEA that month were on time 81.7% of the time (11,893 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 43%, late-arriving aircraft 26% and national aviation system 20%.

On time 82.9%
Arrived 15+ minutes late 15.7%
Cancelled 0.9%
Diverted 0.5%

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

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

Measure	Jan 2025	Jan 2024	SEA, 12 months to Jul 2026	All reported flights, Jan 2025
Departed on time	82.3%	67.9%	78.2%	79.3%
Arrived on time	82.9%	68.3%	78.6%	78.6%
Cancelled	0.9%	8.2%	0.9%	3.0%
Average departure delay (late minutes only)	10.6 min	19.0 min	13.2 min	14.0 min
Scheduled departures a day	396	392	452	17,992
Scheduled departures	11,882	11,751	164,821	539,747

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	5,586	47%	81.0%	-0.4 min	0.9%
DL Delta Air Lines	2,364	20%	83.7%	-1.3 min	0.8%
OO SkyWest Airlines	2,138	18%	84.7%	-1.9 min	0.8%
UA United Airlines	609	5%	87.2%	-6.6 min	1.0%
WN Southwest Airlines	520	4%	89.6%	-5.6 min	0.2%
AA American Airlines	375	3%	82.9%	-0.4 min	2.4%
F9 Frontier Airlines	117	1%	82.1%	-0.1 min	0.9%
HA Hawaiian Airlines	69	1%	72.5%	3.0 min	4.3%
NK Spirit Airlines	59	0%	88.1%	-9.9 min	0.0%
B6 JetBlue Airways	31	0%	77.4%	0.5 min	3.2%
MQ Envoy Air	14	0%	92.9%	-13.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SEA–LAX	Seattle to Los Angeles	624	90.2%	-9.3 min	0.2%
SEA–PHX	Seattle to Phoenix	597	86.6%	-3.7 min	0.0%
SEA–SFO	Seattle to San Francisco	523	86.8%	-6.1 min	0.4%
SEA–ANC	Seattle to Anchorage	499	69.7%	9.9 min	0.8%
SEA–LAS	Seattle to Las Vegas	484	84.9%	-0.8 min	0.0%
SEA–DEN	Seattle to Denver	447	87.0%	0.1 min	0.2%
SEA–DFW	Seattle to Dallas/Fort Worth	405	81.0%	0.4 min	3.7%
SEA–PDX	Seattle to Portland	400	82.5%	0.2 min	0.8%
SEA–GEG	Seattle to Spokane	397	78.8%	3.4 min	0.0%
SEA–SJC	Seattle to San Jose	353	89.8%	-7.8 min	0.8%
SEA–SAN	Seattle to San Diego	345	83.2%	-0.7 min	0.6%
SEA–SLC	Seattle to Salt Lake City	320	89.7%	-6.8 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), January 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Jan 2025	Minutes
Air carrier	43.3%	36.2%	43,962
Late-arriving aircraft	25.7%	34.7%	26,088
National Aviation System	19.8%	19.9%	20,086
Extreme weather	11.0%	9.1%	11,169
Security	0.2%	0.2%	170

101,475 delay minutes on 1,864 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 January 2025?

82.3% of 11,882 scheduled domestic departures left less than 15 minutes late, and 82.9% reached their destination on time. The national figures that month were 79.3% and 78.6%.

How does that compare with a year earlier?

In January 2024, 67.9% of 11,751 departures left on time and 8.2% were cancelled, against 82.3% and 0.9% in January 2025.

Provenance

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