Best for destination specific airfare alerts
Airfarewatchdog lets you set flight alerts from city-to-city, from a departure city, or to a destination city. However, you can't set specific dates so it's the best for people who are flexible and just want to be in the know on destination specific deals. Deals are less 🤖 and more 👫: they're verified by actual analysts instead of being based purely on data since flight prices are ultimately still an inexact science.
For knowing the best time to buy
Know where and when you want to go but aren't sure when's the best time to buy? Hopper will tell you. They use a data centric approach that analyses billions of flight prices daily to predict the best time. Hopper is also smartphone only, no email alerts. They think mobile push notifications help people act faster to lock down deals, which makes sense. It's a more modern approach to airfare deals and the apps themselves are a joy to use.
The Flight Deal
Great curated deals from the US
Although The Flight Deal's website seems spammy (to the point where you might question it's authenticity 🤔), the deals they find are among the best with detailed breakdowns on how to book. They're mainly for flights from bigger cities in the US and are short lived so it's important to jump on them fast.
Scott's Cheap Flights
Great curated deals from a variety of locations with a premium twist
Set the city you want to depart from and this service will email you great international flight deals. The catch is there's two levels: free and premium ($5/month). Premium provides more deals and earlier notice, which can be crucial. As long as you're patient and flexible, there's money to be saved regardless of the tier.