Accra-Libreville Flights in July

My wife and I will fly to Accra in July--during the rainy season.
Since we will have a month, it occurred to me that a short flight to
Gabon might be worth a week or ten days of rainforest adventure there.
But, I can't get any information about estimated costs and frequency
of flights between Accra and Gabon. Any additional advice from
veterans in this area would be greatly appreciated. This is our first
trip to Sub-Saharan Africa.

Alan