parc 55 san francisco - a hilton hotel4 out of 5 union square save 100% on your flight price was $544, price is now $406 per person $406 per person apr 17 - apr 20 found 1 day ago roundtrip flight included seattle (sea) to san francisco (sfo) book a stay at this business-friendly hotel in san francisco. enjoy 2 restaurants, breakfast (surcharge), and a 24-hour fitness center. our guests praise the helpful staff and the clean rooms in our reviews. popular attractions oracle park and lombard street are located nearby. lovely staff and convenient location. reviewed on nov 27, 2025