Most important European towns are served by several airports, which might all be convenient - so growing your search can Web you a greater ticket value. I exploit Skyscanner almost completely. I’ve never heard of the ITA Matrix, just checked it out and it appeared OK but style of restricting. https://bookmarkdistrict.com/story19331687/facts-about-how-to-find-cheap-flights-to-europe-from-the-us-revealed