Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bristol to Cyril E. King as you normally would.
At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Bristol and St Thomas for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.
When travelling, we recommend packing in preparation to handle common weather conditions. The rainfall in Bristol is typically greater than that of St Thomas. We can gather that this will continue over the next 19 days.
You can imagine temperatures to be in the 33 °C range in August. The weather in St Thomas is generally hotter than Bristol's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.