To save on the cost of your flight from Portsmouth to Phnom Penh, book at least 61 days before your planned departure. Booking around this time can save you about 19% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £536 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £576.
Due to multiple factors, expect to potentially pay more when booking in August. For low rates, May can be a great choice for travel to Phnom Penh. Flights to Phnom Penh from Portsmouth in May are about £526 on average during May, but can be found for as low as £324.
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 Southampton and Phnom Penh 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.
In Southampton, there will be greater rainfall in Southampton compared to Phnom Penh over the next 10 days.
Our data indicates that the weather will be 35 °C on average in the month of April. The temperature in Phnom Penh is typically hotter than in Southampton. If you're traveling when the temperature is at its warmest, push to plan early, as flight price and availability will have an impact on your travels. For the best results, search for flights well in advance or after peak season.