Seattle/Tacoma International in July 2024

73.8%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 July 2024, reporting carriers scheduled 16,198 domestic departures from Seattle/Tacoma International (SEA). 73.8% left less than 15 minutes late and 72.5% reached their destination on time; 1.7% were cancelled.

Nationally that month, 68.5% of flights departed on time and 68.1% arrived on time, so SEA departures were 5.3 points above the national departure figure.

Flights arriving at SEA that month were on time 73.4% of the time (16,200 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 46%, late-arriving aircraft 34% and national aviation system 18%.

On time 72.5%
Arrived 15+ minutes late 25.6%
Cancelled 1.7%
Diverted 0.2%

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

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

Measure	Jul 2024	Year earlier	SEA, 12 months to Jul 2026	All reported flights, Jul 2024
Departed on time	73.8%	—	78.2%	68.5%
Arrived on time	72.5%	—	78.6%	68.1%
Cancelled	1.7%	—	0.9%	2.9%
Average departure delay (late minutes only)	15.2 min	—	13.2 min	24.9 min
Scheduled departures a day	540	—	452	21,154
Scheduled departures	16,198	—	164,821	634,613

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	7,672	47%	69.9%	9.0 min	0.8%
DL Delta Air Lines	2,974	18%	71.8%	12.1 min	4.8%
OO SkyWest Airlines	2,603	16%	83.5%	2.3 min	0.2%
UA United Airlines	1,011	6%	73.9%	10.1 min	4.5%
WN Southwest Airlines	884	5%	71.2%	11.1 min	0.0%
AA American Airlines	611	4%	68.2%	25.0 min	1.5%
F9 Frontier Airlines	158	1%	57.6%	32.8 min	3.2%
NK Spirit Airlines	100	1%	61.0%	17.5 min	3.0%
B6 JetBlue Airways	93	1%	67.7%	21.3 min	1.1%
HA Hawaiian Airlines	62	0%	80.6%	-2.0 min	3.2%
MQ Envoy Air	30	0%	80.0%	27.2 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
SEA–ANC	Seattle to Anchorage	869	67.4%	9.0 min	1.0%
SEA–DEN	Seattle to Denver	718	74.5%	8.5 min	1.7%
SEA–LAX	Seattle to Los Angeles	694	76.8%	6.0 min	1.7%
SEA–SFO	Seattle to San Francisco	624	72.8%	9.5 min	2.9%
SEA–PHX	Seattle to Phoenix	613	71.5%	9.3 min	1.5%
SEA–LAS	Seattle to Las Vegas	589	68.4%	12.2 min	2.0%
SEA–ORD	Seattle to Chicago	575	65.9%	14.9 min	2.3%
SEA–DFW	Seattle to Dallas/Fort Worth	520	69.8%	15.4 min	1.7%
SEA–SAN	Seattle to San Diego	438	76.7%	7.8 min	1.1%
SEA–PDX	Seattle to Portland	437	71.2%	9.8 min	0.5%
SEA–GEG	Seattle to Spokane	433	79.4%	6.8 min	1.4%
SEA–SJC	Seattle to San Jose	431	80.3%	5.4 min	0.7%

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), July 2024.

Delay causes

BTS cause category	Share of delay minutes	National, Jul 2024	Minutes
Air carrier	46.2%	36.6%	103,585
Late-arriving aircraft	33.9%	42.7%	75,885
National Aviation System	18.2%	16.0%	40,717
Extreme weather	1.5%	4.6%	3,360
Security	0.2%	0.1%	422

223,969 delay minutes on 4,140 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 July 2024?

73.8% of 16,198 scheduled domestic departures left less than 15 minutes late, and 72.5% reached their destination on time. The national figures that month were 68.5% and 68.1%.

How does that compare with a year earlier?

July 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 July 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.