A full range of PCR, LAMP, rapid antigen and antibody tests for Covid will be available to passengers from a single location at each MAG airport.
Passengers can also book discounted pre-travel testing appointments at selected Boots stores.
MAG chief executive Charlie Cornish said the move would ensure passengers have access to "the right test for the right destination".
Tests will only be available for travel purposes; anyone with Covid symptoms should instead go to the NHS.
Besides simplifying any pre-travel testing needs, as required by individual destinations, passengers will also be able to book tests at any of the three MAG airports to take advantage of the government’s new test to release scheme, which will launch on 15 December.
Test to release will allow passengers returning from non-travel corridor destinations to take a test five days into their mandatory 14-day period of self-isolation.
If negative, they will be allowed to leave quarantine.
Antibody tests will cost £40, antigen tests £50, LAMP tests £79 and PCR tests £99.
Cornish added: “With many countries now welcoming visitors who can show they are infection-free, we wanted to make the process of planning a holiday or business trip as easy and cost-effective as possible in the current circumstances.
“That is why we have created a booking option on our website, which enables you to select the right test for the right destination, and at the location that is most convenient – either at one of our airports or on the high street."
