PCR and Antigen covid tests are available at the Mexico City International airport in Terminal 1. Not sure if/when they will be available in Terminal 2. But, there is a shuttle that will transport passengers between the terminals for testing.
Testing at MEX (Spanish)
TRANSLATED:
"Home Ministry of Communications and Transportation Press
They install a laboratory for Covid-19 tests in AICM
• The measure is in support of passengers and crew of international flights
The laboratory is located between gates 3 and 4 of Terminal 1.
Author
Ministry of Communications and Transportation
Publication date
January 26, 2021
Category
Release
The Benito Juárez International Airport in Mexico City (AICM) supported the installation of a laboratory, so that passengers and crew of international flights can undergo Covid-19 tests, a requirement to travel to some countries.
As part of the support in the transfer of passengers to be tested, the Aerotrén service between terminals will begin at 04:00 hours.
The laboratory is located between gates 3 and 4 of Terminal 1. In the coming days, more laboratories that have Cofepris certifications will be installed to carry out ...to perform the test and detect Covid-19.
In the installed service, the Antigen test has a cost of 680 pesos and the result is delivered in 15 minutes. The PCR test costs 2,500 and is ready in 24 hours. It is worth mentioning that the prices will be determined by each laboratory located in the AICM."
REUTERS:"Jan 31 (Reuters) - Mexico City's international airport will set up facilities to perform COVID-19 tests to help passengers who need to show they are free of the virus to enter other countries, the government said on Sunday.
The Benito Juarez International Airport will work with airlines to install the testing labs, which would be outside the terminals, the government said in a statement. Other areas could also be used for testing if necessary, it added."
*I'll add this to the thread that lists the airports conducting testing.