6 Free Flight Price Alert Apps Worth Using

Most “free” flight price alert apps hide their best features behind a paywall or quietly cap you to one departure airport. We tested and compared the options so you don’t have to find that out mid-search. Here are six tools worth your time, and who each one actually suits.

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1. Google Flights , Fast Alerts & Flexible Search

Google Flights is the most capable free flight tracking tool most people already have access to. No account required to search, though you do need a Google account to save routes and receive alerts.

When you track a flight or route, you get email updates when the price changes significantly. You also get a notification when prices are likely to rise, including an estimate of how much and how confident the system is in that prediction. That price forecast feature is what separates it from most competitors on this list.

The flexible date calendar is genuinely useful. You can search an entire month and see the cheapest days laid out visually, which matters more than most people realize. If you’re planning a trip to Europe and have a two-week window, that calendar view can save you a significant amount on its own, and it works especially well for transatlantic routes.

The main limitation: alerts arrive by email, not push notification. That’s fine for routes where prices move slowly, but if you’re chasing a flash sale, email is too slow. Google Flights also works best on desktop. The mobile experience is capable, but the full power of the date grid and filter combinations is easier to handle on a larger screen.

Pro Tip: Track both the specific flight and the general route separately. Google Flights sends different alerts for each. The route alert catches deals you might not have considered, while the specific flight alert tells you exactly when your preferred itinerary drops.

2. Going , Curated Deals & Email Alerts

Going (formerly Scott’s Cheap Flights) takes a different approach. Instead of asking you to search and monitor prices yourself, their team finds deals and sends them to you. The free tier gives you access to a limited selection of US economy deals, but excludes Hawaii, Alaska, and US territories.

The free account is genuinely useful if your travel style is flexible. You tell Going where you’re flying from, and they send you deals when something worth booking appears. The deals are human-reviewed, which means fewer false positives than a purely algorithmic system. If you’ve ever gotten a price alert for a routing with a 14-hour layover in a city you’d never choose, you’ll appreciate that filter.

The catch is real: the free tier is narrow. You get economy deals from a small set of US airports, and the selection is limited compared to what paid members see. If you fly regularly from a major hub and your destination list is flexible, the free tier works. If you have a specific route in mind or fly from a smaller airport, you’ll hit the ceiling fast.

Going works best as a deal-discovery tool rather than a route-specific tracker. Set it up, forget it, and act when something interesting arrives in your inbox.

3. Skyscanner , Multi-City Alerts

Skyscanner is one of the few free tools that handles multi-city search well. If you’re planning a trip with a custom layover or want to visit two cities on one ticket, it’s the most capable free option for that specific use case.

The price alert system works by letting you save a route and receive notifications when the price changes. The app has a feature called Drops, which scans for flight price drops of at least 20% from your home airport daily. You set your departure city and Skyscanner surfaces deals automatically, without you needing to run a search. That’s a useful passive layer if you check the app occasionally rather than obsessively monitoring fares.

The “Everywhere” search is worth knowing about. If you type “Everywhere” as your destination, Skyscanner shows you the cheapest flights from your airport to anywhere in the world, sorted by price. It’s a good tool for inspiration when you have dates but no destination locked in. A timing strategy around those searches pairs well with Skyscanner’s flexible search.

One honest note: some advertised prices don’t match what’s available at checkout. That’s a known issue with aggregator tools generally, not unique to Skyscanner, but worth keeping in mind. Always verify the final price on the airline or booking site before committing.

4. Airfarewatchdog , Human-Curated Deals

Airfarewatchdog uses a combination of algorithms and human editors to find deals and push them to subscribers via email. The human curation element is what makes it different from a pure price-scraping tool.

The free tier gives you access to email alerts for deals from your chosen departure airports. Editors review fares before they go out, which filters out the routing nightmares and error fares that expire before you can book them. If you’ve been burned by a deal that disappeared in 20 minutes, the human review layer adds some protection, though it also means the alerts arrive slightly slower than a fully automated system.

Airfarewatchdog works well for flexible travelers who want to be surprised. You’re not tracking a specific route. You’re saying “I fly from Dallas, show me what’s good” and letting the editorial team do the work. If you have a fixed destination and specific dates, a route-tracking tool like Google Flights will serve you better. If you’re open to wherever the deal takes you, Airfarewatchdog is a solid free option.

The email-only alert method is a limitation worth flagging. Across the free tools we looked at, 71% of those that specify an alert channel use email rather than push notifications. Airfarewatchdog fits that pattern. For deals that move fast, email creates a lag. Check your inbox regularly or set up a filter that flags Airfarewatchdog emails as priority.

5. Dollar Flight Club , Free Single-Airport Alerts

Dollar Flight Club’s free tier is straightforward and honest about its limits: you get alerts for deals from one departure airport. That’s it. No multi-airport coverage, no premium deal categories, just one origin and whatever deals the system finds from there.

For travelers who always fly from the same city, that constraint doesn’t matter much. If you’re in Chicago and you always leave from O’Hare, the free tier gives you a steady stream of deals without any noise from airports you’d never use. The alerts cover both domestic and international routes, which is more useful than it sounds for a free account.

The paid tiers unlock multiple departure airports and premium economy or business class deals, but the free version is a legitimate tool for the right user. It’s worth setting up alongside one of the broader tools on this list rather than using it as your only alert source.

Dollar Flight Club sends alerts by email. Response time matters here. If you’re planning a trip to Japan and want to catch the right fare window, it helps to know what a good price actually looks like before the alert arrives.

6. Momondo , Fare Insights & Price Tracker

Momondo searches hundreds of travel sites simultaneously and lets you set price alerts for flights, hotels, and rental cars. The app is owned by Kayak.

The Fare Insights feature shows you whether prices for your route are currently low, typical, or high relative to historical data. That context is useful. Knowing a fare is 30% below the typical range for that route tells you something a raw price number doesn’t. The app also has a budget-based search called Momondo Explore, where you enter a maximum spend and it shows you what destinations are reachable from your airport at that price.

Momondo is slower to update than Google Flights, which is the main trade-off. If you’re monitoring a route where prices shift daily, Google Flights will catch changes faster. But if you’re in the early planning stage and want broad coverage across many booking sites, Momondo’s aggregation is genuinely wide. It consistently surfaces options that narrower tools miss, particularly on less common international routes.

The free tier has no meaningful restrictions on price alerts. Set alerts for as many routes as you want, and Momondo sends a notification when prices change. The app is available on iOS, Android, and web.

Key Takeaway: Momondo works best as a wide-net search tool during early trip planning, then hand off to Google Flights for precise route monitoring once you’ve locked in your destination.

Flight Price Alert Apps: Side-by-Side Comparison

Here’s how the six options stack up across the factors that actually matter for a free user. Use this to match the tool to how you actually plan trips.

Tool	Alert Method	Free Tier Limit	Best For	Key Caveat
Google Flights	Email	No limits	Flexible date search, price forecasts	Email-only, no push alerts
Going	Email	US economy deals only; no Hawaii/Alaska	Flexible travelers open to deals	Narrow free selection
Skyscanner	App notifications	No stated limits	Multi-city itineraries, inspiration search	Prices occasionally don’t match at checkout
Airfarewatchdog	Email	No stated limits	Flexible travelers who want human-curated deals	Slower than automated tools
Dollar Flight Club	Email	One departure airport only	Travelers who always fly from the same city	Single-airport cap on free tier
Momondo	App notifications	No stated limits	Wide aggregation, budget-based search	Slower updates than Google Flights

A few patterns stand out. Email dominates as the alert method across free tools. Only Skyscanner and Momondo push notifications through the app. If speed matters to you, that narrows the field quickly. Free-tier limits are explicit for only a handful of tools. Going and Dollar Flight Club are upfront about their restrictions. Others simply don’t disclose them, which means you may hit a wall after signing up.

None of these tools integrate with each other or with broader travel planning platforms. They work as standalone trackers. That’s worth knowing if you’re hoping to pipe alerts into a trip-planning workflow. The usable workaround most experienced travelers use: run Google Flights for route-specific monitoring, add Going or Airfarewatchdog for deal discovery, and lean on solid booking research to interpret what you’re seeing.

If you’re planning an international trip and want to know how far ahead to start tracking, the answer varies significantly by region. Our guide on how far in advance to book international flights covers the data behind optimal booking windows by destination type.

How to Choose the Right Tool for Your Trip

The right tool depends on one question: do you have a specific route in mind, or are you open to wherever the deal takes you?

• Specific route, fixed dates: Google Flights. Set a route alert and a specific flight alert. Check the price forecast feature to understand whether the current fare is likely to rise or fall.
• Specific route, flexible dates: Google Flights for the date grid plus Momondo for broad aggregation across booking sites.
• Open destination, flexible dates: Going or Airfarewatchdog for curated deal emails. Add Skyscanner’s Drops feature for passive daily scanning.
• Always fly from the same airport: Dollar Flight Club free tier makes sense as a low-effort background alert.
• Planning a multi-city trip: Skyscanner handles the search. Pair it with Google Flights to verify pricing on individual legs.

One thing the research data makes clear: free tiers are genuinely useful, but only 33% of these tools explicitly describe what the free tier includes. Before you rely on any tool, spend five minutes understanding what it won’t show you without paying. The limitations aren’t always obvious until you’ve already built your workflow around the app.

Airline ticket prices change based on demand, time to departure, and seat availability, which is why consistent monitoring over weeks rather than days tends to produce better results than checking once and hoping.

Frequently Asked Questions

Do free flight price alert apps actually work?

Yes, but with caveats. Google Flights and Momondo send reliable alerts with no meaningful free-tier restrictions. Going and Dollar Flight Club work well but cap what the free account can monitor. The tools work best when you use them consistently over several weeks rather than checking once close to your travel date. Real savings come from tracking early, not from the tool itself.

Which app sends the fastest flight price alerts?

Google Flights and Skyscanner are generally the fastest. Most free flight tracking apps send alerts by email, which introduces a lag. Skyscanner and Momondo push app notifications, which arrive faster. If you’re chasing a flash sale or an error fare, email-based alerts from tools like Going or Airfarewatchdog may arrive too late to act on.

Can I track multiple routes for free?

Google Flights and Momondo let you track multiple routes on the free tier without restriction. Dollar Flight Club caps free users to one departure airport. Going’s free tier covers a limited selection of US economy deals. Skyscanner and Airfarewatchdog don’t publicly state a limit on the number of routes you can monitor for free.

How far in advance should I set a flight price alert?

For international flights, set alerts at least three to six months before your travel date. For domestic routes, one to three months is usually enough. Prices tend to be highest in the final two to three weeks before departure. The earlier you start tracking, the better your sense of what a genuinely good price looks like for that route.

Is Google Flights free to use for price alerts?

Yes. Google Flights is completely free. You need a Google account to save routes and receive email alerts, but there’s no paid tier and no cap on how many routes or flights you can track. It’s the most capable free flight tracking tool available, particularly for flexible date searches and price forecasting on specific routes.

Do these apps work for international flights?

Most of them do. Google Flights, Skyscanner, and Momondo cover international routes well. Going’s free tier focuses on US-origin deals but does include international destinations. Dollar Flight Club’s free account covers international deals from your one designated departure airport. Airfarewatchdog covers both domestic and international fares from major US airports.

Final Thoughts

If you only set up one tool today, make it Google Flights. It’s free, fast, and honest about what it shows you. Add Going or Airfarewatchdog if you want deals to come to you rather than searching yourself. And when you’re ready to turn a price alert into an actual booking strategy, a solid booking guide will tell you what to do with the number once you have it.