SEA · Seattle–Tacoma International Airport

Share of flights 15+ min late, by month

departures arrivals usual for the month (departures) Jan 2015 → Jul 2026; gridlines 10/20/30/40%

Month	Flights	Late 15+	vs usual	Cancelled	Avg min	Main cause
Jul 2026	16,214	26.5%	+3.3	0.8%	17	Airline
Jun 2026	15,402	25.7%	+4.3	0.5%	16	Airline
May 2026	14,564	19.8%	+3.0	0.4%	12	Airline
Apr 2026	12,864	15.4%	-2.2	0.2%	10	Airline
Mar 2026	12,830	23.1%	+5.6	2.2%	15	Airline
Feb 2026	11,000	16.0%	+2.0	0.8%	10	Airline
Jan 2026	11,927	19.9%	+3.0	1.9%	13	Airline
Dec 2025	13,023	27.3%	+4.7	1.0%	17	Airline
Nov 2025	12,616	16.5%	+1.3	1.7%	11	Airline
Oct 2025	13,859	17.7%	+3.5	1.2%	11	Airline
Sep 2025	14,552	16.6%	+0.6	0.3%	10	Airline
Aug 2025	15,970	24.8%	+5.9	0.7%	14	Airline
Jul 2025	16,577	27.8%	+10.0	1.4%	18	Airline
Jun 2025	15,695	27.8%	+8.7	0.6%	16	Late aircraft
May 2025	14,630	19.6%	+4.8	0.4%	11	Airline
Apr 2025	12,716	16.8%	-0.8	0.2%	10	Airline
Mar 2025	12,577	17.5%	+3.1	0.4%	11	Airline
Feb 2025	10,738	20.8%	+6.8	1.3%	13	Airline
Jan 2025	11,882	16.9%	+0.6	0.9%	11	Airline
Dec 2024	12,596	20.4%	-2.2	0.5%	12	Airline
Nov 2024	12,453	13.4%	-2.5	0.4%	8	Airline
Oct 2024	13,763	14.2%	-0.3	0.4%	8	Airline
Sep 2024	14,805	18.6%	+2.6	0.3%	10	Airline
Aug 2024	15,984	24.5%	+5.5	0.8%	15	Airline

Airline	Flights	Late	Canc.
SkyWest	2,577	12.4%	0.0%
Frontier	100	14.0%	0.0%
Envoy	114	16.7%	0.0%
Delta	2,857	16.9%	0.6%
Alaska	6,823	21.7%	0.4%
United	816	21.9%	0.7%
American	630	27.0%	1.1%
Southwest	610	34.5%	0.3%
JetBlue	37	38.9%	2.7%

Airlines with 30+ departures that month.

Date	Flights	Late	Canc.
2022-12-23	480	91%	73%
2021-02-13	361	91%	66%
2021-12-27	446	88%	35%
2021-12-26	435	79%	49%
2021-12-28	416	84%	30%
2017-02-06	343	83%	27%
2019-02-04	350	86%	12%
2026-03-13	429	77%	40%
2018-11-20	371	81%	7%
2017-11-03	384	77%	9%
2022-12-24	370	70%	27%
2021-12-30	447	64%	35%

Departures; ranked by share late or cancelled.