Seattle/Tacoma International in March 2024

80.5%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 March 2024, reporting carriers scheduled 12,627 domestic departures from Seattle/Tacoma International (SEA). 80.5% left less than 15 minutes late and 79.8% reached their destination on time; 0.3% were cancelled.

Nationally that month, 78.5% of flights departed on time and 78.3% arrived on time, so SEA departures were 2.0 points above the national departure figure.

Flights arriving at SEA that month were on time 82.8% of the time (12,627 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 43%, late-arriving aircraft 27% and national aviation system 26%.

On time 79.8%
Arrived 15+ minutes late 19.7%
Cancelled 0.3%
Diverted 0.2%

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

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

Measure	Mar 2024	Year earlier	SEA, 12 months to Jul 2026	All reported flights, Mar 2024
Departed on time	80.5%	—	78.2%	78.5%
Arrived on time	79.8%	—	78.6%	78.3%
Cancelled	0.3%	—	0.9%	0.9%
Average departure delay (late minutes only)	12.3 min	—	13.2 min	15.7 min
Scheduled departures a day	421	—	452	19,726
Scheduled departures	12,627	—	164,821	591,767

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	6,132	49%	75.4%	5.8 min	0.4%
DL Delta Air Lines	2,468	20%	85.0%	0.6 min	0.0%
OO SkyWest Airlines	2,104	17%	86.0%	2.4 min	0.0%
UA United Airlines	625	5%	81.4%	7.1 min	0.3%
WN Southwest Airlines	582	5%	80.4%	4.4 min	0.5%
AA American Airlines	386	3%	81.3%	20.8 min	1.6%
F9 Frontier Airlines	90	1%	66.7%	27.1 min	3.3%
HA Hawaiian Airlines	63	0%	81.0%	14.8 min	3.2%
B6 JetBlue Airways	62	0%	77.4%	6.0 min	0.0%
NK Spirit Airlines	62	0%	72.6%	16.3 min	0.0%
MQ Envoy Air	53	0%	92.5%	20.9 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SEA–PHX	Seattle to Phoenix	671	80.3%	6.4 min	0.1%
SEA–LAX	Seattle to Los Angeles	567	79.7%	3.0 min	0.2%
SEA–LAS	Seattle to Las Vegas	549	74.9%	12.1 min	0.7%
SEA–ANC	Seattle to Anchorage	534	77.3%	3.0 min	0.2%
SEA–SFO	Seattle to San Francisco	523	53.2%	25.6 min	0.0%
SEA–DEN	Seattle to Denver	494	77.5%	7.6 min	1.6%
SEA–GEG	Seattle to Spokane	434	80.0%	6.4 min	0.0%
SEA–PDX	Seattle to Portland	421	81.5%	5.0 min	0.0%
SEA–SAN	Seattle to San Diego	374	79.1%	3.1 min	0.3%
SEA–SJC	Seattle to San Jose	366	84.7%	0.9 min	0.3%
SEA–BOI	Seattle to Boise	352	90.6%	-1.6 min	0.3%
SEA–DFW	Seattle to Dallas/Fort Worth	333	77.8%	10.5 min	1.5%

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), March 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Mar 2024	Minutes
Air carrier	42.8%	32.1%	61,430
Late-arriving aircraft	27.0%	42.1%	38,729
National Aviation System	25.9%	21.4%	37,251
Extreme weather	4.2%	4.2%	5,992
Security	0.1%	0.2%	195

143,597 delay minutes on 2,486 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 March 2024?

80.5% of 12,627 scheduled domestic departures left less than 15 minutes late, and 79.8% reached their destination on time. The national figures that month were 78.5% and 78.3%.

How does that compare with a year earlier?

March 2023 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 March 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.