How will I know if my bag will be checked through?

If you have connecting flights with the same airline most of the times your bags will be checked all the way through. 

If you have connecting flights but with different airlines, that will depend on the agreement they have between both airlines. 

The best way to confirm is to check with the airport staff. In some cases, even if they can check your bag all the way through to your final destination, you still need to pick it up at the entry point of a country to go through customs, so we recommend that check with them at the airport directly.