All of the big aggregator sites have price alerts. To grab short-term deals you have Airfarewatchdog and Going (formerly Scott’s Cheap Flights, subscription nee

All of the big aggregator sites have price alerts. To grab short-term deals you have Airfarewatchdog and Going (formerly Scott’s Cheap Flights, subscription needed for the best deals). All of those cover many more countries and airlines than you offer, without the risk of the airlines blocking them. Subscribing to the airline promotional emails can yield some big offers for members of frequent flyer programs. Last year I got two business class r/t Bangkok to LAX half price because Singapore Air sent an email to me.