Answer: Both of these airports are about equal in distance:
The nearest major airport is Charles M. Schulz - Sonoma County Airport (STS / KSTS). This airport has domestic flights from Santa Rosa, California and is about 49 driving miles from the center of Napa.
The other close, major airport is Oakland International Airport (OAK / KOAK), which has international and domestic flights from Oakland, California and is 51 driving miles from Napa.
Answer: The driving distance between Vancouver, BC, Canada and Napa, CA is 1481 km.The driving time would be approximately 14 hours 30 minutes if driving non-stop in good conditions. (The driving time does not take into consideration conditions such as weather, road work and rush hour traffic in urban areas.)