DL3999 Santa AnaSNA · 18:02 SeattleSEA · 20:50
DL3999 by Delta Air Lines flies from Santa Ana (SNA) to Seattle (SEA).
scheduled from SNA
Where the minutes go
last 3 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SNA and SEA are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, 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 →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Santa Ana to Seattle flights today
same route · Delta Air LinesIf DL3999 is cancelled, these are the other Delta Air Lines nonstop flights from Santa Ana to Seattle on the same day, with scheduled departure times in SNA local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How DL3999 actually runs
Pro Flight Search has tracked every published board update for DL3999 across the SNA and SEA boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 3 completed legs so far: departed +73 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how DL3999 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N311SY, N294SY, N297SY.
Board clocks recorded as SNA and SEA published them.
Planning around DL3999? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — DL3999 Santa Ana to Seattle on-time performance, measured from the SNA and SEA airport boards.
https://proflightsearch.com/flight/DL3999
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