Flight number record

OO 4137

SkyWest Airlines · Spokane to Seattle

Route: GEG → SEA
Departs: 06:10
Flights: 276
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4137, 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 4137 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 about an hour. That rests on 276 flights, with a median arrival 16 minutes early.

Set against the rest of the country, OO 4137's record is 18 points better than the US average of 77.6%. That gap is worth roughly 180 fewer late arrivals for every thousand flights.

On time

95.6%

Arrivals under 15 minutes late, of 273 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

0.36%

National rate is 1.81%

1 hour+ late

1.5%

National rate is 8.1%

These figures cover 276 flights between July 2025 and June 2026. The median arrival is 16 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 4137 flies

OO 4137 flies GEG to SEA without a single fixed slot. Its most common scheduled departure was 06:10, used on 96 of 276 flights, with 06:05 (80 flights) and 06:00 (44 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:1096 flights34.8%
Departs 06:0580 flights29.0%
Departs 06:0044 flights15.9%

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 06:10 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 4137 runs 6 points better at 95.6%. 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 4137 next to GEG to SEA

Every carrier on GEG to SEA combined arrived on time 85.9% of the time across 5,183 flights, so OO 4137 is 10 points ahead of it. SkyWest flew 3,020 flights on the same city pair under all its flight numbers, including this one, and those ran 88.2% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 17 points.

OO 4137 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4137thin sample	276	95.6%	63 min	0.36%	A+
All SkyWest Airlines on GEG–SEA	3,020	88.2%	60 min	0.99%	A+
All carriers on GEG–SEA	5,183	85.9%	55 min	1.06%	A
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 4137 quarter by quarter

Quarter by quarter OO 4137 held fairly steady: 98.9% in Jul–Sep 2025, 94.2% in Oct–Dec 2025, 92.1% in Jan–Mar 2026 and 96.9% 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 202588 flights94.2%
Jan–Mar 202664 flights92.1%
Apr–Jun 202632 flights96.9%

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

By weekday, OO 4137 ranged from 90.0% on Friday to 100.0% on Wednesday. With about 39 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.

Delay causes

Why OO 4137 runs late

One category carries most of the weight here. Carrier accounts for 50% of the 751 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
50%
Extreme weather
43%
National Airspace System
6%

Extreme weather accounts for 43% 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 6.9 times the usual weather exposure. The split is drawn from 751 delay minutes reported on OO 4137.

Cancellations are rare at 0.36%, 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 1.5% 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.

The same number turns up on two other city pairs in the data, including MSN to DTW (3) and SAN to LAX (1), but none flew often enough under OO 4137 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to GEG to SEA only.

One caution: this is a thin sample. 276 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 4137

For a booking, OO 4137 has one of the better records a US domestic flight can show: 95.6% on time and 0.36% 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