Flight number record

OO 3789

SkyWest Airlines · Seattle to San Jose

Route: SEA → SJC
Departs: 11:45
Flights: 345
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3789, 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 3789 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 345 flights, with a median arrival 7 minutes early.

Set against the rest of the country, OO 3789's record is 7 points better than the US average of 77.3%. That gap is worth roughly 68 fewer late arrivals for every thousand flights.

On time

84.1%

Arrivals under 15 minutes late, of 345 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.89%

1 hour+ late

4.9%

National rate is 8.3%

These figures cover 345 flights between September 2025 and August 2026. The median arrival is 7 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.

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Schedule

When OO 3789 flies

OO 3789 flies SEA to SJC without a single fixed slot. Its most common scheduled departure was 11:45, used on 88 of 345 flights, with 10:25 (39 flights) and 12:34 (36 flights) next.

Departs 11:4588 flights25.5%
Departs 10:2539 flights11.3%
Departs 12:3436 flights10.4%

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 11:45 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 3789 runs 6 points better at 84.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

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Against the route

OO 3789 next to SEA to SJC

Every carrier on SEA to SJC combined arrived on time 80.1% of the time across 4,425 flights, so OO 3789 is 4 points ahead of it. SkyWest flew 1,626 flights on the same city pair under all its flight numbers, including this one, and those ran 85.7% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 5 points.

OO 3789 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3789thin sample	345	84.1%	62 min	0.00%	B+
All SkyWest Airlines on SEA–SJC	1,626	85.7%	59 min	0.18%	A+
All carriers on SEA–SJC	4,425	80.1%	49 min	0.56%	B+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 3789 quarter by quarter

OO 3789 did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.3% on time and its weakest Jul–Sep 2026 at 75.9%, a swing of 16 points on roughly 69 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 202580 flights83.8%
Jan–Mar 202686 flights81.4%
Apr–Jun 202691 flights92.3%
Jul–Sep 202658 flights75.9%

Scale runs 65% to 100%.

By weekday, OO 3789 ranged from 80.4% on Monday to 90.0% on Wednesday. With about 49 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late OO 3789 runs when it is late

OO 3789 often beats the schedule: 106 of 345 completed flights, 31%, arrived 15 minutes or more early. The 55 late arrivals split 23 under half an hour, 15 between 30 and 60 minutes, and 17 an hour or more.

15+ min early106 flights30.7%
Within 15 min184 flights53.3%
15–29 min late23 flights6.7%
30–59 min late15 flights4.3%
1–2 hours late10 flights2.9%
2+ hours late7 flights2.0%

Scale runs 0% to 100%.

Share of 345 completed flights by arrival against schedule.

9 of 52 late departures made up the time and arrived on time, 17% of them. 12 flights left on time and still arrived late.

The worst days

Worst days for OO 3789

The latest arrival of the period was on 21 November 2025, 9 hours 48 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).

The latest arrivals of OO 3789 in the period
Date	Arrived late by	Largest filed cause
21 November 2025	9 hours 48 minutes	Extreme weather
11 February 2026	2 hours 38 minutes	Carrier
19 January 2026	2 hours 36 minutes	Carrier
16 July 2026	2 hours 35 minutes	Extreme weather
28 July 2026	2 hours 19 minutes	Carrier

Delay causes

Why OO 3789 runs late

Carrier accounts for 50% of the 3,427 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
50%
Extreme weather
40%
National Airspace System
10%

Extreme weather accounts for 40% 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 6.7 times the usual weather exposure. The split is drawn from 3,427 delay minutes reported on OO 3789.

Cancellations are rare at 0.00%, below the national 1.89% 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 4.9% land an hour or more behind schedule, against 8.3% 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.

The 696 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.

The same number turns up on three other city pairs in the data, including SJC to SEA (192), STL to DTW (15) and LEX to DTW (1), but none flew often enough under OO 3789 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to SJC only.

One caution: this is a thin sample. 345 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 3789

For a booking, read OO 3789 as 84.1% on time with 0.00% cancelled over 345 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