Use Expedia to help you arrange a flight to Oakland, CA (OAK-Oakland Intl.) airport or San Francisco International Airport (SFO) airport, and then choose from a variety of places to stay that will deliver the luxury you want. Amenities are important when you plan a trip, so we make it easy to get what you need to make your stay special. If you want an upscale hotel with fine dining, a spa or several swimming pools, Expedia can help you find the best luxury hotel experience that Union Square has to offer. During your visit, you might want to enjoy the art and shopping which Union Square is known for.