Flight number record

OO 3749

SkyWest Airlines · Lewiston to Seattle

Route: LWS → SEA
Departs: 07:00
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3749, 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 3749 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 14 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 364 flights, with a median arrival 13 minutes early.

Set against the rest of the country, OO 3749's record is 14 points better than the US average of 77.6%. That gap is worth roughly 143 fewer late arrivals for every thousand flights.

On time

91.9%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.81%

1 hour+ late

3.3%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. The median arrival is 13 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 3749 flies

OO 3749 flies LWS to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 106 of 364 flights, with 07:05 (90 flights) and 07:10 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00106 flights29.1%
Departs 07:0590 flights24.7%
Departs 07:1037 flights10.2%

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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3749 runs 3 points better at 91.9%. 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 3749 next to LWS to SEA

Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 13 points.

OO 3749 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3749thin sample	364	91.9%	79 min	0.27%	A+
All SkyWest Airlines on LWS–SEAthin sample	364	91.9%	79 min	0.27%	A+
All carriers on LWS–SEAthin sample	364	91.9%	79 min	0.27%	A+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3749 quarter by quarter

OO 3749 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Oct–Dec 2025 at 85.7%, a swing of 11 points on roughly 91 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 202591 flights96.7%
Oct–Dec 202592 flights85.7%
Jan–Mar 202690 flights90.8%
Apr–Jun 202691 flights94.5%

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

By weekday, OO 3749 ranged from 88.5% on Thursday to 96.0% on Wednesday. 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 3749 runs late

One category carries most of the weight here. Carrier accounts for 65% of the 2,282 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
65%
Extreme weather
29%
National Airspace System
6%

Extreme weather accounts for 29% 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 4.7 times the usual weather exposure. The split is drawn from 2,282 delay minutes reported on OO 3749.

Cancellations are rare at 0.27%, 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 3.3% 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 364 flights under OO 3749 in the data flew LWS 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. 364 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 3749

For a booking, OO 3749 has one of the better records a US domestic flight can show: 91.9% on time and 0.27% 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