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Looking for cheap flights from London Heathrow to San Antonio? Then you have come to the right place. With Carlton Leisure, you get matchless deals on cheap flights to San Antonio departing from London Heathrow .We are the appointed agents for all major airlines which operate flights to San Antonio from London Heathrow. To find the best flight deals from London Heathrow to San Antonio, remember to select 'my dates are flexible' in the search engine.