Leaving on a Sunday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 47% on the overall cost on flights from Bangkok to Liverpool.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bangkok to Liverpool as you normally would.
Expect the weather to be around 36 °C on average in April. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Liverpool is generally colder than in Bangkok.