Hi and welcome,
As you still have 2 days left for flying, you can consult a dentist
and get the clinical examination done for the affected tooth. An x ray examination of the tooth will show the exact picture of affected teeth , extent of abscess
and the tissue damage.
If the abscess is tooth related that it can be drained by treating the tooth with root canal
And if it is a gum abscess, complete deep scaling of gums along with root planing of teeth will remove all the infection and remnants and subside the symptoms.
If the pain is severe , it may go worse on flying due to air pressure on the high altitudes. Though you can have analgesics like aceclofenac serratiopeptidase
combination tablets every 6 hours to relieve pain in emergency. take care