Flight number record

OO 3707

SkyWest Airlines · San Francisco to Seattle

Route: SFO → SEA
Departs: 16:37
Flights: 331
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3707, 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 3707 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about 45 minutes behind schedule. Build slack into anything you connect to. That rests on 331 flights, with a median arrival 3 minutes late.

The national on-time rate over the same period is 77.3%, so OO 3707 runs 12 points behind the country as a whole. Across a thousand flights that is about 122 extra late arrivals.

On time

65.1%

Arrivals under 15 minutes late, of 327 completed flights

Avg delay

46 min

Across delayed arrivals only, not all flights

Cancelled

1.21%

National rate is 1.89%

1 hour+ late

8.6%

National rate is 8.3%

These figures cover 331 flights between September 2025 and August 2026. Beyond the headline rate, 8.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Schedule

When OO 3707 flies

OO 3707 flies SFO to SEA without a single fixed slot. Its most common scheduled departure was 16:37, used on 41 of 331 flights, with 16:40 (39 flights) and 16:45 (34 flights) next.

Departs 16:3741 flights12.4%
Departs 16:4039 flights11.8%
Departs 16:4534 flights10.3%

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 16:37 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 3707 runs 7 points worse at 65.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Against the route

OO 3707 next to SFO to SEA

Every carrier on SFO to SEA combined arrived on time 72.3% of the time across 6,821 flights, so OO 3707 is 7 points behind it. SkyWest flew 1,040 flights on the same city pair under all its flight numbers, including this one, and those ran 68.8% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 14 points.

OO 3707 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3707thin sample	331	65.1%	46 min	1.21%	C
All SkyWest Airlines on SFO–SEA	1,040	68.8%	50 min	1.15%	C
All carriers on SFO–SEA	6,821	72.3%	56 min	1.08%	C
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 3707 quarter by quarter

OO 3707 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Apr–Jun 2026 at 44.2%, a swing of 39 points on roughly 66 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 flights75.3%
Jan–Mar 202673 flights80.6%
Apr–Jun 202686 flights44.2%
Jul–Sep 202662 flights54.8%

Scale runs 35% to 90%.

By weekday, OO 3707 did best on Saturday at 82.1% on time and worst on Thursday at 49.0%. Each day rests on about 47 flights, so a gap of 33 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 3707 runs when it is late

The 114 late arrivals split 45 under half an hour, 41 between 30 and 60 minutes, and 28 an hour or more.

15+ min early48 flights14.7%
Within 15 min165 flights50.5%
15–29 min late45 flights13.8%
30–59 min late41 flights12.5%
1–2 hours late22 flights6.7%
2+ hours late6 flights1.8%

Scale runs 0% to 100%.

Share of 327 completed flights by arrival against schedule.

16 of 105 late departures made up the time and arrived on time, 15% of them. In the other direction, 25 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.

The worst days

Worst days for OO 3707

The latest arrival of the period was on 6 March 2026, 3 hours 19 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.

The latest arrivals of OO 3707 in the period
Date	Arrived late by	Largest filed cause
6 March 2026	3 hours 19 minutes	Carrier
16 April 2026	2 hours 53 minutes	Carrier
29 July 2026	2 hours 29 minutes	Carrier
5 January 2026	2 hours 28 minutes	National Airspace System
26 November 2025	2 hours 11 minutes	Carrier

Delay causes

Why OO 3707 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 5,246 reported delay minutes.

Carrier
40%
National Airspace System
33%
Extreme weather
27%

Extreme weather accounts for 27% 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 4.5 times the usual weather exposure. The split is drawn from 5,246 delay minutes reported on OO 3707.

Cancellations sit at 1.21% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.6% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 45 minutes, which a normal layover absorbs.

The 679 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.

OO 3707 is not only a SFO to SEA flight. It also flew SEA to SFO (325 flights, 68.5% 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. 331 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 3707
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SEA to SFOthin sample	325	68.5%	44 min	1.23%	C

What to do with this

Booking OO 3707

For a booking, OO 3707 is one of the weaker ways to fly SFO to SEA: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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