Due to multiple factors, expect to potentially pay more when booking in March. For low rates, August can be a great choice for travel to Cambridge. Flights to Cambridge from Derry in August are about £58 on average during August, but can be found for as low as £42.
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 Derry and Cambridge 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 22 °C range in July. The weather in Cambridge is generally hotter than Derry's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.