A short-haul flight deal alert is a service that lets you cap how long the flight can be, so a cheap fare never turns out to be a ten-hour journey for a two-day trip. As of 2026-10-18, SunnyFlight is the only free alert we found where that cap is part of the alert itself, set once at signup as 2h, 5h or 10h+ alongside a price limit and a minimum temperature.

Most deal tools optimise for the best fare, not the best-fitting trip. A curated newsletter such as Going or Jack’s Flight Club picks fares for quality and will happily send a long-haul bargain; a search tool like Google Flights or Skyscanner can cap duration, but only on a search you run yourself.

Alert-level cap vs. search-level filter

The practical difference is who does the work. With a search-level filter you pick the dates, open Explore, apply a duration limit and repeat each time. With an alert-level cap you set the limit once and the tool does the scanning. That is the case for a purpose-built alert for weekend trips, and the reason it is narrower: SunnyFlight covers direct Friday-to-Sunday trips only, once a week.

What you give up

A flight-time cap and a direct-only rule will occasionally return nothing. SunnyFlight emails only when a match exists, so some weeks bring no email at all. It also does not compare every airline or check baggage. If you want long-haul, fixed dates or premium cabins, Going or a manual Google Flights search is the better tool.