Seattle/Tacoma International in June 2024

72.8%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 June 2024, reporting carriers scheduled 15,183 domestic departures from Seattle/Tacoma International (SEA). 72.8% left less than 15 minutes late and 74.2% reached their destination on time; 0.5% were cancelled.

Nationally that month, 73.7% of flights departed on time and 73.9% arrived on time, so SEA departures were 0.9 points below the national departure figure.

Flights arriving at SEA that month were on time 72.5% of the time (15,186 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 44%, late-arriving aircraft 35% and national aviation system 18%.

On time 74.2%
Arrived 15+ minutes late 25.1%
Cancelled 0.5%
Diverted 0.2%

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

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

Measure	Jun 2024	Year earlier	SEA, 12 months to Jul 2026	All reported flights, Jun 2024
Departed on time	72.8%	—	78.2%	73.7%
Arrived on time	74.2%	—	78.6%	73.9%
Cancelled	0.5%	—	0.9%	1.3%
Average departure delay (late minutes only)	15.5 min	—	13.2 min	19.7 min
Scheduled departures a day	506	—	452	20,371
Scheduled departures	15,183	—	164,821	611,132

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	7,163	47%	71.0%	7.7 min	0.5%
DL Delta Air Lines	2,828	19%	81.3%	3.1 min	0.0%
OO SkyWest Airlines	2,467	16%	77.5%	8.8 min	0.1%
UA United Airlines	896	6%	80.4%	3.1 min	1.0%
WN Southwest Airlines	838	6%	64.6%	16.3 min	0.0%
AA American Airlines	607	4%	75.3%	9.6 min	2.1%
F9 Frontier Airlines	146	1%	64.4%	26.3 min	2.7%
B6 JetBlue Airways	78	1%	60.3%	13.8 min	0.0%
HA Hawaiian Airlines	61	0%	68.9%	52.4 min	6.6%
NK Spirit Airlines	60	0%	76.7%	3.3 min	0.0%
MQ Envoy Air	39	0%	69.2%	18.3 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SEA–ANC	Seattle to Anchorage	796	70.0%	10.8 min	0.8%
SEA–DEN	Seattle to Denver	683	71.9%	10.2 min	0.4%
SEA–LAX	Seattle to Los Angeles	645	80.3%	4.8 min	0.3%
SEA–PHX	Seattle to Phoenix	593	74.5%	9.3 min	0.2%
SEA–LAS	Seattle to Las Vegas	554	74.9%	7.2 min	0.4%
SEA–SFO	Seattle to San Francisco	523	61.4%	16.8 min	0.6%
SEA–ORD	Seattle to Chicago	522	75.5%	7.3 min	1.1%
SEA–DFW	Seattle to Dallas/Fort Worth	450	72.2%	7.8 min	1.3%
SEA–PDX	Seattle to Portland	422	67.1%	15.5 min	0.0%
SEA–SAN	Seattle to San Diego	410	74.9%	6.6 min	0.0%
SEA–SJC	Seattle to San Jose	407	74.0%	10.7 min	0.2%
SEA–GEG	Seattle to Spokane	403	74.4%	11.3 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), June 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Jun 2024	Minutes
Air carrier	43.7%	34.4%	86,933
Late-arriving aircraft	35.3%	41.5%	70,078
National Aviation System	17.9%	17.8%	35,508
Extreme weather	3.0%	6.0%	6,009
Security	0.1%	0.2%	242

198,770 delay minutes on 3,807 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 June 2024?

72.8% of 15,183 scheduled domestic departures left less than 15 minutes late, and 74.2% reached their destination on time. The national figures that month were 73.7% and 73.9%.

How does that compare with a year earlier?

June 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 June 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.