It is worth noting that booking through comparison sites doesn't give you the same reassurance as booking directly with the airline; plenty of gripes in newspaper customer service stories. I have used comparison sites and then armed with the best price booked directly with the airline. Opodo, Skyscanner (now Chinese owned and not the best prices when we booked to Asia) Kayak are easy to use and my latest favourite Momondo, Google flights, Expedia are others. Enjoy your trip.