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 Belfast International and Basel 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.
You can imagine temperatures to be in the 26 °C range in July. The weather in Basel is generally hotter than Belfast International's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.