the westin st. francis san francisco on union square4.5 out of 5 union square save 100% on your flight price was $794, price is now $471 per person $471 per person jul 7 - jul 10 found 1 day ago roundtrip flight included las vegas (las) to san francisco (sfo) book a stay at this luxury hotel in san francisco. enjoy breakfast (surcharge), room service, and a 24-hour fitness center. our guests praise the helpful staff and the clean rooms in our reviews. popular attractions oracle park and pier 39 are located nearby. loved our stay here! reviewed on dec 26, 2025