| Nonstop Flights: San Antonio to/from Mexico City $228-$256 r/t [March-May] â Aeromexico Aeromexico has round-trip flights from San Antonio (SAT) to Mexico City (MEX) for $256, NONSTOP. Flights March to May. Weekends available. Origin/Destination reversible. Note: Some small OTAs on Skyscanner have this for about $228. If you plan on booking there, beware of any site that charges a fee to cancel a ticket within the 24-hour âfreeâ period. Use unknown booking sites at your own risk. If youâre unsure, book directly with the airline. Click for more details and booking links Nonstop Flights: San Antonio to/from Mexico City $228-$256 r/t [March-May] â Aeromexico . | 