Flight number record

OO 3433

SkyWest Airlines · Seattle to Bellingham

Route: SEA → BLI
Departs: 15:50
Flights: 258
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3433, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.

OO 3433 lands a B, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 258 flights, with a median arrival 4 minutes early.

On time

81.0%

Arrivals under 15 minutes late, of 252 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

2.33%

National rate is 1.89%

1 hour+ late

6.0%

National rate is 8.3%

These figures cover 258 flights between September 2025 and August 2026. The median arrival is 4 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Schedule

When OO 3433 flies

OO 3433 flies SEA to BLI without a single fixed slot. Its most common scheduled departure was 15:50, used on 70 of 258 flights, with 16:44 (35 flights) and 14:08 (33 flights) next.

Departs 15:5070 flights27.1%
Departs 16:4435 flights13.6%
Departs 14:0833 flights12.8%

Scale runs 0% to 100%.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 15:50 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 3433 runs 9 points better at 81.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

OO 3433 next to SEA to BLI

Every carrier on SEA to BLI combined arrived on time 83.3% of the time across 1,185 flights, so OO 3433 is 2 points behind it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 2 points.

OO 3433 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3433thin sample	258	81.0%	62 min	2.33%	B
All SkyWest Airlines on SEA–BLI	1,185	83.3%	53 min	2.28%	B
All carriers on SEA–BLI	1,185	83.3%	53 min	2.28%	B
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 3433 quarter by quarter

OO 3433 did not run the same all year. Its best quarter was Jan–Mar 2026 at 85.1% on time and its weakest Jul–Sep 2026 at 71.0%, a swing of 14 points on roughly 52 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202530 flights83.3%
Oct–Dec 202554 flights84.0%
Jan–Mar 202649 flights85.1%
Apr–Jun 202663 flights84.1%
Jul–Sep 202662 flights71.0%

Scale runs 65% to 90%.

By weekday, OO 3433 did best on Saturday at 88.6% on time and worst on Thursday at 73.0%. Each day rests on about 37 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 3433 runs when it is late

The 48 late arrivals split 18 under half an hour, 15 between 30 and 60 minutes, and 15 an hour or more.

15+ min early45 flights17.9%
Within 15 min159 flights63.1%
15–29 min late18 flights7.1%
30–59 min late15 flights6.0%
1–2 hours late11 flights4.4%
2+ hours late4 flights1.6%

Scale runs 0% to 100%.

Share of 252 completed flights by arrival against schedule.

12 of 57 late departures made up the time and arrived on time, 21% of them. Only 3 left on time and still arrived late.

The worst days

Worst days for OO 3433

The latest arrival of the period was on 6 March 2026, 5 hours 47 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of OO 3433 in the period
Date	Arrived late by	Largest filed cause
6 March 2026	5 hours 47 minutes	Carrier
18 August 2026	4 hours 39 minutes	Late-arriving aircraft
7 March 2026	3 hours 57 minutes	Carrier
29 August 2026	2 hours 34 minutes	Late-arriving aircraft
6 January 2026	1 hour 46 minutes	Late-arriving aircraft

Delay causes

Why OO 3433 runs late

Late-arriving aircraft accounts for 49% of the 2,958 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
49%
Carrier
32%
National Airspace System
16%
Extreme weather
3%

49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,958 reported delay minutes here, that single category outweighs weather by 18 to one. The split is drawn from 2,958 delay minutes reported on OO 3433.

Cancellations sit at 2.33% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

6.0% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The same number turns up on four other city pairs in the data, including BLI to SEA (215), STS to SNA (46) and SNA to STS (19), but none flew often enough under OO 3433 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to BLI only.

One caution: this is a thin sample. 258 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking OO 3433

For a booking, read OO 3433 as 81.0% on time with 2.33% cancelled over 258 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

A flight number here means SkyWest Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures