Flight number record

OO 4145

SkyWest Airlines · Seattle to Spokane

Route: SEA → GEG
Departs: 13:30
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4145, 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 4145 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 45 minutes. That rests on 365 flights, with a median arrival 10 minutes early.

Set against the rest of the country, OO 4145's record is 11 points better than the US average of 77.6%. That gap is worth roughly 108 fewer late arrivals for every thousand flights.

On time

88.4%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

44 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

2.5%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 10 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 4145 flies

OO 4145 flies SEA to GEG without a single fixed slot. Its most common scheduled departure was 13:30, used on 76 of 365 flights, with 13:40 (52 flights) and 13:50 (51 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:3076 flights20.8%
Departs 13:4052 flights14.2%
Departs 13:5051 flights14.0%

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 13:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 4145 runs 10 points better at 88.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 4145 next to SEA to GEG

Every carrier on SEA to GEG combined arrived on time 82.5% of the time across 5,221 flights, so OO 4145 is 6 points ahead of it. SkyWest flew 3,058 flights on the same city pair under all its flight numbers, including this one, and those ran 87.7% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 9 points.

OO 4145 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4145	365	88.4%	44 min	0.55%	A+
All SkyWest Airlines on SEA–GEG	3,058	87.7%	55 min	1.05%	A
All carriers on SEA–GEG	5,221	82.5%	51 min	1.00%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4145 quarter by quarter

Quarter by quarter OO 4145 held fairly steady: 88.0% in Jul–Sep 2025, 92.4% in Oct–Dec 2025, 89.8% in Jan–Mar 2026 and 83.3% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights88.0%
Oct–Dec 202592 flights92.4%
Jan–Mar 202690 flights89.8%
Apr–Jun 202691 flights83.3%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4145 did best on Wednesday at 96.1% on time and worst on Thursday at 80.8%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4145 runs late

One category carries most of the weight here. Carrier accounts for 56% of the 1,861 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.

Carrier
56%
Extreme weather
38%
National Airspace System
6%

Extreme weather accounts for 38% 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 6.0 times the usual weather exposure. The split is drawn from 1,861 delay minutes reported on OO 4145.

Cancellations are rare at 0.55%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is 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 2.5% 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.

OO 4145 is not only a SEA to GEG flight. It also flew GEG to SEA (309 flights, 92.2% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 365 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.

Other routes flown as OO 4145
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
GEG to SEAthin sample	309	92.2%	48 min	0.65%	A+

What to do with this

Booking OO 4145

For a booking, OO 4145 has one of the better records a US domestic flight can show: 88.4% on time and 0.55% 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