ON TIMEBOARD
Alaska Airlines / SEA → BLI

AS 3433 on time

Alaska Airlines 3433: Seattle to Bellingham at 3:50 p.m.; Bellingham to Seattle at 5:26 p.m. (past 12 months). Figures below the title are for SEA → BLI, its busiest leg

On time
79%
258 flights · likely 74–84%
Cancelled
2.3%
of scheduled flights
Typical arrival
−4 min
median vs schedule
When late
+62 min
average delay
Similar flights
77%
AS, same route & hour

About 1 in 5 AS 3433 flights from Seattle arrived 15+ minutes late, diverted or cancelled over the past year (21%); 2.3% were cancelled. The typical flight landed 4 minutes early.

AS 3433: SEA → BLI

Scheduled to leave Seattle at 3:50 p.m. local time, operated by SkyWest as OO 3433. Over the past year it arrived on time 79% of the time (258 flights), in line with other AS flights on the route at that hour (77%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: 83% on time (30 flights)83SepOct 2025: too few flights (9 flights)OctNov 2025: 73% on time (30 flights)73NovDec 2025: 80% on time (15 flights)80DecJan 2026: too few flights (6 flights)JanFeb 2026: 100% on time (15 flights)100FebMar 2026: 82% on time (28 flights)82MarApr 2026: 93% on time (30 flights)93AprMay 2026: too few flights (12 flights)MayJun 2026: 71% on time (21 flights)71JunJul 2026: 87% on time (31 flights)87JulAug 2026: 55% on time (31 flights)55Aug

By day of week

DayFlightsOn time
Monday3982%
Tuesday3781%
Wednesday3683%
Thursday3871%
Friday3871%
Saturday3784%
Sunday3382%

Why it was late

Late inbound plane 49%Airline (crew, maintenance, ops) 32%Air traffic & airport (NAS) 16%Severe weather 3%

All flights SEA → BLI · Connecting off AS 3433? Check the risk

AS 3433: BLI → SEA

Scheduled to leave Bellingham at 5:26 p.m. local time, operated by SkyWest as OO 3433. Over the past year it arrived on time 76% of the time (215 flights), better than other AS flights on the route at that hour (72%). Last seen in the data Aug 31, 2026.

Usually Alaska Airlines's last flight of the day from Bellingham to Seattle (100% of days). Alaska Airlines's last BLI–SEA flight was cancelled 1.6% of the time, against 2.4% for its earlier ones. If it's cancelled, the next Alaska Airlines flight is usually around 6:00 a.m. the next morning.

Month by month

40%70%100%Oct 2025: too few flights (6 flights)OctNov 2025: 72% on time (29 flights)72NovDec 2025: 80% on time (15 flights)80DecJan 2026: too few flights (6 flights)JanFeb 2026: too few flights (11 flights)FebMar 2026: 74% on time (23 flights)74MarApr 2026: 93% on time (30 flights)93AprMay 2026: too few flights (12 flights)MayJun 2026: 71% on time (21 flights)71JunJul 2026: 77% on time (31 flights)77JulAug 2026: 65% on time (31 flights)65Aug

By day of week

DayFlightsOn time
Monday3476%
Tuesday2781%
Wednesday2778%
Thursday3269%
Friday3370%
Saturday3382%
Sunday2979%

Why it was late

Airline (crew, maintenance, ops) 50%Late inbound plane 34%Air traffic & airport (NAS) 13%Severe weather 3%

All flights BLI → SEA · Connecting off AS 3433? Check the risk

Questions

How often is AS 3433 from SEA to BLI late?

Alaska Airlines 3433 from Seattle, WA to Bellingham, WA arrived 15 or more minutes late, was diverted or was cancelled on 21% of 258 scheduled flights between September 2025 and August 2026. 2.3% were cancelled.

How often is AS 3433 from BLI to SEA late?

Alaska Airlines 3433 from Bellingham, WA to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 24% of 215 scheduled flights between September 2025 and August 2026. 2.8% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Alaska Airlines for today's flight. Method.