When you request a price alert, this is based on the specific route and dates you’ve searched for. It will also remember the number of travellers you’ve searched for and whether you’ve indicated a preference for direct flights. It isn’t currently possible to apply additional filters (such as flight times or flight duration), but we are looking to introduce this in the future.
We then check each day for the lowest price on that route for the dates you requested across all providers and route options. If your search is for two or more travelers, we check for price changes per traveler and will also show you the whole group price in the email.