WN3955Southwest Airlines · SMF → ONT
updated 3h ago
Route confirmed Southwest Airlines

WN3955 SacramentoSMF · 20:45 OntarioONT · 22:10

WN3955 by Southwest Airlines flies from Sacramento (SMF) to Ontario (ONT).

Right nowNext departure today Operates daily
20:45

scheduled from SMF

⚖ WN3955 typically leaves +18 and lands +2. The air wins minutes back.
Typical gate push+18 minmedian posted departure
Typical arrival+2 minmedian over 9 operations
Wins back in air~16 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 7 operations · gate push → arrival
0+30+60+90 min
11-05
+18 gate · −6 arrival
10-30
+26 gate · +2 arrival
10-29
+18 gate · −6 arrival
10-28
+76 gate · +55 arrival
10-27
+6 gate · −16 arrival
10-26
+18 gate · −3 arrival
10-25
+0 gate · +7 arrival

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The last 30 days

arrival outcome per operation

median arrival +2 min · 0 cancelled · 9 operations tracked

The route today

live boards
SMFSacramentoOn-time likelySMF delay board →
ONTOntarioOn-time likelyONT delay board →
SMF→ONTevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
44%Chance of 15+ min delay
0.2%Chance of cancellation
+9 minTypical airport delay in this weather

Conditions at SMF and ONT are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

Tomorrow at Sacramento

Forecast

Fri 6 Nov, local date

High22°Clikely 20°C to 23°C
Low5°Clikely 4°C to 7°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at Ontario

Forecast

Fri 6 Nov, local date

High27°Clikely 25°C to 28°C
Low13°Clikely 12°C to 15°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other Sacramento to Ontario flights today

same route · Southwest Airlines
WN3307departs 06:00
WN969departs 06:05
WN738departs 06:25
WN3935departs 08:00
WN3672departs 08:40
WN743departs 08:55

If WN3955 is cancelled, these are the other Southwest Airlines nonstop flights from Sacramento to Ontario on the same day, with scheduled departure times in SMF local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How WN3955 actually runs

Pro Flight Search has tracked every published board update for WN3955 across the SMF and ONT boards: schedule changes, gate pushes and actual clocks. Usually lands ~11 min late. Based on 9 confirmed landings · 5/9 within 15 min of schedule.

The verdict above is that record speaking, so it reflects how WN3955 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocksaircraft

Board log

scheduled → actual, per operation
11-05SMF 20:45 21:03 (+18)ONT 22:10 22:04 (−6)
10-30SMF 20:45 21:11 (+26)ONT 22:10 22:12 (+2)
10-29SMF 20:45 21:03 (+18)ONT 22:10 22:04 (−6)
10-28SMF 20:55 22:11 (+76)ONT 22:15 23:10 (+55)
10-27SMF 20:55 21:01 (+6)ONT 22:15 21:59 (−16)
10-26SMF 20:45 21:03 (+18)ONT 22:10 22:07 (−3)
10-25SMF 21:20 (+0)ONT 22:40 22:47 (+7)
10-23SMF 20:45 21:35 (+50)ONT 22:10 22:28 (+18)
10-22SMF 20:45 23:31 (+166)ONT 22:10 00:25 (+135)

Aircraft

Recent tails: N1809U, N8721J, N8611F, N8980Q.

Board clocks recorded as SMF and ONT published them.

Planning around WN3955? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search: WN3955 Sacramento to Ontario on-time performance, measured from the SMF and ONT airport boards.

Canonical URL
https://proflightsearch.com/flight/WN3955
How we measure this →