Guests with existing The Westin San Francisco Airport reservations for any future arrival date, including reservations with pre-paid rates, can make full changes or cancellations without a charge up to 24 hours prior to arrival, as long as the change or cancellation is made by June 30, 2020. For guests making new reservations at The Westin San Francisco Airport for any future arrival date, including reservations with pre-paid rates, between today and June 30, 2020, reservations may be changed or canceled at no charge up to 24 hours before your scheduled arrival date. For more information, visit the Mariott Response to COVID-19 page. Get latest prices on KAYAK now!