Fairfield is on the I-80 corridor. It has nothing to do with the Napa Valley. (I know it is cheaper, but it would not be worth the savings.)
I would try very hard to stay in the Valley itself, somewhere on Hwy 29, which is where the vineyards are.
If you give the forum members your budget, they will help you find a charming and suitable lodging which is not on a freeway, and where you can enjoy the atmosphere of the valley.
Because of budget? There is a cool place right in St. Helena called The El Bonita Motel that is budget friendly. Calistoga also has some places, the Best Western Stevenson Manor and a Comfort Inn. :).
I found the perfect located hotel with all the amenities, comfort and price point The Hawthorn Wyndham Napa Hotel. Located on Soscol, just a block away from the famous Silverado Trail/Wineries. My wife and I will always stay there. Please check it out.! You will not be disappointed.
I don't know about Fairfield, but on our last trip to Napa Valley we stayed at a chain motel near Vallejo and drove about 20 minutes each morning to get to the Silverado Trail. Spent just a little over $300 for 4 nights (in early September). The extra few minutes driving each day was worth it to us -- had an extra grand to spend on wine. :-)
The highway between Fairfield and Napa is under construction. There can be severe traffic problems during morning and evening commute times.
In Vallejo, if you choose to stay there, be careful of the area you choose. The best locations are near 6 Flags Discovery Kingdom since that is where tourists go.
But, staying in the Napa Valley is your best option unless you can afford only really inexpensive lodging.
This has already been adequately covered, but just to chime in, there's no reason to stay in Fairfield. If you look at a map, you'll see it's far from the wineries in Napa Valley. You didn't say anything about your itinerary, but I'm assuming you'll be there to taste wine as most visitors are. If you want more affordable than the valley, look at the town of Napa itself where you can find a more reasonably priced room but still be in a decent area. Personally, I'd avoid Vallejo at all costs.
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