Flight number record

OO 3775

SkyWest Airlines · Boise to Seattle

Route: BOI → SEA
Departs: 05:45
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3775, 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 3775 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 361 flights, with a median arrival 17 minutes early.

Set against the rest of the country, OO 3775's record is 18 points better than the US average of 77.6%. That gap is worth roughly 177 fewer late arrivals for every thousand flights.

On time

95.3%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

0.8%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 2026. The median arrival is 17 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.

Schedule

When OO 3775 flies

OO 3775 flies BOI to SEA without a single fixed slot. Its most common scheduled departure was 05:45, used on 84 of 361 flights, with 05:40 (74 flights) and 05:20 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:4584 flights23.3%
Departs 05:4074 flights20.5%
Departs 05:2041 flights11.4%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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

A 05:45 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3775 runs 6 points better at 95.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 3775 next to BOI to SEA

Every carrier on BOI to SEA combined arrived on time 85.7% of the time across 3,820 flights, so OO 3775 is 10 points ahead of it. SkyWest flew 2,929 flights on the same city pair under all its flight numbers, including this one, and those ran 86.2% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 16 points.

OO 3775 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3775thin sample	361	95.3%	71 min	0.00%	A+
All SkyWest Airlines on BOI–SEA	2,929	86.2%	58 min	0.27%	A+
All carriers on BOI–SEA	3,820	85.7%	56 min	0.39%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3775 quarter by quarter

Quarter by quarter OO 3775 held fairly steady: 98.9% in Jul–Sep 2025, 93.3% in Oct–Dec 2025, 92.0% in Jan–Mar 2026 and 96.7% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights98.9%
Oct–Dec 202590 flights93.3%
Jan–Mar 202688 flights92.0%
Apr–Jun 202691 flights96.7%

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3775 ranged from 90.4% on Sunday to 98.0% on Friday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 3775 runs late

One category carries most of the weight here. Extreme weather accounts for 70% of the 1,201 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Extreme weather
70%
Carrier
26%
National Airspace System
4%

Extreme weather accounts for 70% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 11.2 times the usual weather exposure. The split is drawn from 1,201 delay minutes reported on OO 3775.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 0.8% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

Every one of the 361 flights under OO 3775 in the data flew BOI to SEA. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 361 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 3775

For a booking, OO 3775 has one of the better records a US domestic flight can show: 95.3% on time and 0.00% cancelled. That is a base rate, not a promise about any single 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures