Welcome to FlyerTalk, Margaret!

My apologies; moderators are volunteers, and somehow your post was sent to a moderator queue for inspection due to our anti-spam protocols.

JDiver, Senior Moderator

Now, to your question. A paucity of choices, and from what I understand some of them could be pricy.

12 flights per week, 40m duration
Dakar, Senegal (DKR) to Banjul, Gambia (BJL)
Search flight prices on Google

12:25 am→1:05 am Arik Air 387 M, T, S

DKR-BJL 2:30 pm→3:00 pm Mauritanian Airlines International 106 M, F

DKR-BJL 6:35 pm→7:15 pm Gambia Bird 1521 F

DKR-BJL 6:35 pm→7:15 pm Gambia Bird 2731 S

DKR-BJL 6:35 pm→7:15 pm Gambia Bird 1121 M, T

DKR-BJL 7:15 pm→7:55 pm Gambia Bird 2131 M

DKR-BJL 7:15 pm→7:55 pm Gambia Bird 2421 T

DKR-BJL 7:50 pm→8:30 pm Gambia Bird 2501 F

Overland and ferry: there was a high speed ferry, I've no idea if it's running.

Otherwise about 5-6 hours. One post on Trip Advisor is four years old:

"No, there's no ferry, unfortunately. However the 5-hour to all-day journey is really very straightforward. Easiest plan is to get a Peugeot taxi from the Pompiers gare routiere (bus/taxi park) in Dakar to the Senegalese border post at Karang (about CFA5000, I think, usually in a seven-seater), where you exit Senegal and take a 1.5km hop in a local vehicle to the Gambian border post at Amdillai. From here, it's a short journey down to Barra on the north shore of the river (local minibus or taxi), where you wait for the ferry across to Banjul."

Lonely Planet's Thorn Tree Forum (named after the famed thorn tree at the Thorn Tree Café at the Stanley Hotel on Kimathi St. in Nairobi used by generations of Travellers posting messages) is more recent: https://www.lonelyplanet.com/thorntr...d-banjul-dakar