Airports servicing Bangkok
Bangkok Suvarnabhumi (BKK)
Bangkok Don Mueang Intl (DMK)
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bangkok to Algiers as you normally would.
Algiers Houari Boumediene (ALG) is the airport you will fly into if you book a flight from Bangkok to Algiers. You should not have trouble finding flights to Houari Boumediene from Bangkok; the airport handles an average of 0 inbound flights from Bangkok per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Algiers airport from Bangkok. It is only a 11.1 km journey from Houari Boumediene (ALG) to Algiers’s city center.
You can imagine temperatures to be in the 36 °C range in April. The weather in Algiers is generally colder than Bangkok's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.