The flight is just under 1 hour.
There are 2 direct flights between Monastir and Tripoli every week.
The flight number is LN333 and it's operated by Libyan Airlines.
From Monastir you will fly out from Habib Bourguiba International (MIR) and you will be landing at Tripoli International (TIP).
Bombardier CRJ / Challenger flies this route operated by Libyan Airlines.
Libyan Airlines have non-stop flights to Tripoli.