Do free flight price alerts work?

Yes, for what they are built to do. Google Flights, Skyscanner and Kayak all track a search reliably and will tell you when the price moves. The limitation is that they report movement rather than judging it, and they are tied to the dates you searched.

Why do I get so many flight alert emails?

Because most alerts fire on any price change, including increases, and fares move constantly. The volume is not a fault in the tool. It is what happens when the threshold for sending an email is 'something happened' rather than 'something worth acting on happened'.

Are paid flight deal services worth the money?

It depends on whether their model matches your travel. Curated services send the same deals to everyone from a set of major hub airports, which works well if you are flexible and live near a hub. If you need specific routes on specific dates, a per-route watcher fits better.

Can I use more than one flight alert service at once?

Yes, and many people do. A free per-search alert for a trip you have already committed to, plus something broader for routes you are only curious about, covers two different jobs without overlapping much.

How far ahead should I set a price alert?

Set it as soon as you know the trip is a possibility. Alerts cost nothing to leave running, and the useful drops on any given route are unpredictable enough that a short watching window mostly guarantees you miss them.

Are flight price alerts worth it?

Almost everyone who books flights has switched on a price alert at some point. A much smaller number still have one running that they read.

That gap is the whole subject. Price alerts are a good idea executed, by default, in a way that trains you to ignore them. Understanding why is the difference between a tool that saves you money and another muted folder.

The four kinds, briefly

They are not all the same product, and the differences matter more than the branding. There is a fuller version of this taxonomy in the four types of flight price alert, including which one fits which trip.

Per-search alerts. Google Flights, Kayak, Skyscanner. You run a search, toggle tracking, and get told when the price of that search changes. Free, reliable, tied to what you searched.

Curated deal lists. Going (formerly Scott’s Cheap Flights), Thrifty Traveler, Dollar Flight Club. Humans and software find unusually low fares out of a set of departure airports and email them to the membership. You are not choosing routes; you are receiving finds.

Target-price alerts. Tell a service your number and hear from it if the fare hits that number. Available in various apps, and only as good as the number you picked, which brings us back to needing to know what the route normally costs.

Per-route watchers. You describe a route and a travel window rather than a fixed search, and the service judges fares against what that route normally costs. Flydar is one of these, so treat this paragraph accordingly.

Why most alerts get muted

Four failure modes account for nearly all of it.

They fire on movement, not meaning. A tool reporting that a price changed will email you when the fare rises. This is not a defect, it is the stated function, but it means a “$9 increase” email arrives with the same weight as a “$240 drop” email. After a fortnight of this the reader stops distinguishing between them, which is the exact capability the alert existed to provide.

They expire quietly. A per-search alert is bolted to the dates you searched. When those dates pass, the alert stops meaning anything, and nothing announces this. People discover that a trip they meant to watch has been silently unwatched for two months.

They are pinned to a single search. One origin, one destination, one date pair. If your city has three airports, that is three alerts. If your dates could flex by a week, the search you saved is one of dozens you might have run. Real flexibility multiplies into administrative work, so most people never set it up properly and quietly under-cover their own trip.

They have no idea what good looks like. This is the deepest one. An alert that tells you the fare fell $40 has told you nothing useful unless you already know what that route normally costs. Without a reference point, every alert becomes a small research task, and after a while you stop opening them.

Where they earn their place

Set against all that, alerts are worth having in two situations.

The first is a trip you have already decided on. You know the route and roughly the dates, you are waiting for a reasonable moment to click, and you want to be told when the number moves. A free per-search alert is close to perfect for this. It is precise, it is immediate, and the noise problem barely bites over a few weeks.

The second is the trip you have not committed to. The vague “I would go to Japan if it were ever cheap” plan that never becomes a search because there is no date to search for. Nobody checks these routes by hand for months on end. Something has to watch, or the fare arrives and departs without you.

Those two jobs are different enough that the same tool rarely does both well.

Free versus paid

Free tools are genuinely good, and any article that skips past this to sell you something is not worth reading. Google Flights tracking costs nothing, works, and covers most of what a casual traveller needs. If you take one or two trips a year and you know your dates, you may not need anything else. Start there.

Paid services are buying you one of two things.

Curated lists buy you discovery: fares you would never have searched for, to places you had not considered, found by someone whose job is finding them. That is a real service, and if you are flexible about where you go and live near one of their departure airports, it can pay for itself in a single booking. If you need Denver to Osaka on specific dates in April, it will not help you, and no amount of subscription fee changes that.

Per-route watchers buy you judgement and persistence: something that keeps watching the routes you named, for as long as you want them watched, and applies a consistent test for whether a fare is low for that route before it interrupts you. That matters if your travel is route-specific, or if the thing you actually want is fewer emails rather than more.

Neither is better in the abstract. They answer different questions, and the honest way to choose is to work out which question is yours. There is a longer breakdown of the main services in the comparison of Going and its alternatives.

Setting alerts you will still read in three months

Five things, in rough order of how much they help.

Set fewer, broader watches. One alert covering a city pair beats six covering individual airport combinations, if your tool can do it. Six alerts is six times the email for the same trip.
Establish the normal range first. Ten minutes with a flexible-date calendar before you set the alert. Then every notification is instantly readable, because you know what the number means.
Raise your own threshold. If your tool lets you set a target price, set it below the route’s normal floor rather than just under today’s fare. A target set at “slightly cheaper than now” fires constantly and teaches you nothing.
Watch trips you have not committed to. These are where alerts pay, because they are the trips you will otherwise never check.
Prune quarterly. Delete the alerts for trips you have taken or abandoned. Alert fatigue is usually the accumulated residue of old searches, not the new ones.

When an alert is the wrong tool

Two cases. Inside about two weeks of departure on a fixed date, watching rarely helps, because the cheap fare buckets are typically gone and the remaining direction of travel is upward. And if you need one specific flight, on one specific day, for a wedding or a connection, you are not shopping for a price, you are buying a seat. Book it.

The tools are worth using. The default configuration is worth changing.