Flight number record
OO 3749
SkyWest Airlines · Lewiston to Seattle
- Route
- LWS → SEA
- Departs
- 07:05
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 365 flights, with a median arrival 9 minutes early.
Set against the rest of the country, OO 3749's record is 10 points better than the US average of 77.3%. That gap is worth roughly 102 fewer late arrivals for every thousand flights.
Key figures
On time
87.5%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
4.2%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 9 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 3749 flies
OO 3749 flies LWS to SEA without a single fixed slot. Its most common scheduled departure was 07:05, used on 70 of 365 flights, with 07:00 (65 flights) and 07:10 (37 flights) next.
- Departs 07:0570 flights19.2%
- Departs 07:0065 flights17.8%
- Departs 07:1037 flights10.1%
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 07:05 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 level with that at 87.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 3749 next to LWS to SEA
Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3749 | 365 | 87.5% | 68 min | 0.27% | A+ |
| All SkyWest Airlines on LWS–SEA | 365 | 87.5% | 68 min | 0.27% | A+ |
| All carriers on LWS–SEA | 365 | 87.5% | 68 min | 0.27% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3749 quarter by quarter
OO 3749 did not run the same all year. Its best quarter was Apr–Jun 2026 at 94.5% on time and its weakest Jul–Sep 2026 at 72.6%, a swing of 22 points on roughly 73 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 flights93.3%
- Oct–Dec 202592 flights85.7%
- Jan–Mar 202690 flights90.8%
- Apr–Jun 202691 flights94.5%
- Jul–Sep 202662 flights72.6%
Scale runs 65% to 100%.
By weekday, OO 3749 ranged from 82.7% on Thursday to 90.0% on Monday. With about 52 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 3749 runs when it is late
OO 3749 often beats the schedule: 127 of 361 completed flights, 35%, arrived 15 minutes or more early. The 45 late arrivals split 14 under half an hour, 16 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early127 flights35.2%
- Within 15 min189 flights52.4%
- 15–29 min late14 flights3.9%
- 30–59 min late16 flights4.4%
- 1–2 hours late7 flights1.9%
- 2+ hours late8 flights2.2%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 29 departures that left 15 minutes late or more, only 2 made it up before arrival. 18 flights left on time and still arrived late.
The worst days
Worst days for OO 3749
The latest arrival of the period was on 19 September 2025, 4 hours 55 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 September 2025 | 4 hours 55 minutes | Carrier |
| 15 August 2026 | 3 hours 30 minutes | Carrier |
| 6 January 2026 | 3 hours 12 minutes | Extreme weather |
| 26 April 2026 | 2 hours 52 minutes | Carrier |
| 18 December 2025 | 2 hours 50 minutes | Extreme weather |
Delay causes
Why OO 3749 runs late
Carrier accounts for 65% of the 3,060 delay minutes carriers reported here, and the remaining four split what is left.
- 65%Carrier
- 25%Extreme weather
- 10%National Airspace System
Extreme weather accounts for 25% 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 4.2 times the usual weather exposure. The split is drawn from 3,060 delay minutes reported on OO 3749.
Cancellations are rare at 0.27%, below the national 1.89% 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 4.2% 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.
Every one of the 365 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. 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.
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: 87.5% on time and 0.27% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- Seattle-Tacoma International (SEA) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- The best time of day to fly, according to 7.05 million flight records
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 ; recomputed monthly. How this data is collected.