Due to multiple factors, expect to potentially pay more when booking in July. For low rates, September can be a great choice for travel to Sioux Falls. Flights to Sioux Falls from Newquay in September are about £807 on average during September, but can be found for as low as £535.
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 Newquay and Sioux Falls 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.
Expected rainfall in Newquay is more than in Sioux Falls. You can expect this to be the case over the next 18 days.
You can imagine temperatures to be in the 30 °C range in July. The weather in Sioux Falls is generally hotter than Newquay's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.