Who this is for: anyone who turned on Track prices, got nothing for weeks, and wants to know whether the tool is broken or just quiet.
How we know: Sources are listed at the end. Everything about how Google's tracking behaves is quoted or paraphrased from Google's own help pages and blog posts, loaded on the date above. Nothing here is a Wildly measurement.
Google Flights price tracking explained in one sentence: you save a route or an itinerary, and Google emails you when its systems decide the price moved "significantly", or when they predict it is about to go up. That word, significantly, is the source of most confusion. Google does not publish the threshold, does not let you set one, and does not promise a check on any schedule. So an alert that never arrives is usually working as designed. This guide walks through what Google actually says it sends, the reasons emails go missing, and what to do about each.
What you can track
Google's help page lists the setup: choose the number of stops, cabin class and ticket count, pick the departure and arrival airports, then turn on Track prices. There are three shapes of tracking (Google Travel Help):
- A route on specific dates. Google emails you "when prices for a tracked flight or route change significantly".
- A route on any dates. Google says: when you track "Any dates", you get an email when the route's minimum price drops significantly over a month. If there is no large enough drop, you get a regular email with the best available prices instead.
- One exact itinerary. After you open a specific flight, you can track that flight alone. Emails then concern that itinerary rather than the whole route.
All saved tracking lives on the Tracked Flights page, where each route or flight has a notification toggle and a Remove link.
What the emails actually contain
Google describes two kinds of message beyond the plain price-change email:
- Likely to go up. Google says you may get an email when "prices for a route you track are likely to go up", or when the current fares will expire soon and the replacement fares are higher. These include an estimated increase and a confidence level (Google Travel Help).
- Best available prices. For "any dates" tracking, the fallback monthly email lists the lowest prices currently available on the route.
The predictions come from the same system that powers the price insights shown on search results. Google's help page says "Prices are less than usual" appears when a fare is significantly below what Google expects "based on an analysis of past prices of similar trips", and "Prices are unlikely to drop before you book" appears when Google predicts with high confidence that the fare will not fall before departure. Google adds that predictions are "based on an analysis of price trends of past flights" and that "there is always a chance that future prices will not behave as we expect" (Google Travel Help).
In August 2023 Google added a "cheapest time to book" insight showing "when prices have typically been lowest to book your chosen dates and destination" for searches with reliable trend data (Google blog). Google's September 2025 post gives the aggregate numbers behind such insights: across round trips observed from January 2021 through August 2025, international fares were lowest "49 days or more before departure", Europe "48 days or more", and Mexico and the Caribbean "50 days before departure (26-79 days is the low price range)" (Google blog). Those are averages over many routes, not a promise about yours.
Why alerts don't arrive
Working from Google's documentation, there are six ordinary explanations. Check them in this order.
1. The price never moved "significantly". This is the most common case. Google does not define the threshold. A fare that drifts from $1,180 to $1,120 may never trigger anything. If you need to know about a specific number, Google's tool is the wrong instrument; see the workaround section.
2. You are not signed in, or tracked a route in a different account. Tracking is attached to a Google account. If you set it up in a work account and read email in a personal one, the emails are going to the other inbox. Open the Tracked Flights page in each account you use.
3. The notification toggle is off. Google's page says each tracked route has a notification control on the Tracked Flights page. Tracking can be on with notifications off, which means the route is saved but nothing is emailed.
4. Gmail filed it as spam or under Promotions. Gmail's own help says legitimate messages can land in Spam when Gmail "can't confirm who sent you the email", and that removing a message from Spam or adding the sender to Contacts stops future messages going there (Gmail Help). Search your mailbox for "Google Flights" including Spam and Promotions before assuming nothing was sent.
5. The search you tracked is not the search you are checking. Tracking is specific to the stops, cabin, passenger count and airports you set. If you tracked "nonstop, one adult, economy" and later look at "1 stop, two adults", the prices you see are a different product and the tracker will not respond to them.
6. The trip dates passed or the itinerary no longer exists. Tracking an exact itinerary ties the alert to that flight. If the airline changes the schedule, the tracked itinerary can quietly stop being priced.
Workarounds that actually help
- Track the route and the itinerary. Route tracking catches new cheap options; itinerary tracking catches changes to the exact flights you want. Set both.
- Track "any dates" alongside your dates. The monthly "best available prices" email is a useful baseline even when nothing triggers on your specific dates.
- Add a threshold alert from another tool. Google will not fire at a number you choose. A Wildly alert does exactly that: it checks the same search on Google Flights once a day and emails you when the lowest fare is at or below your target, with up to plus or minus 3 days of date flexibility if you want it. The two tools together cover both "the price moved a lot" and "the price hit my number". How Wildly makes its daily observation is described on /methodology, and plan limits are on /pricing.
- Look at the route's observed history before setting a number. Route pages such as Seattle to Tokyo, New York to Paris and Los Angeles to London show the lowest fare found in the latest daily check with its date, and, once enough days have accumulated, typical, good and great bands. Wildly records daily prices on about 240 routes; route pages show observed ranges as they accumulate.
- Whitelist the sender. Add the Google Flights sender to Contacts, per Gmail's help, so future emails skip Spam.
The price guarantee is a different feature
People sometimes expect the tracker to refund them if a fare drops after booking. That is the separate price guarantee, and it has narrow terms: the itinerary must carry the "Google Price Guarantee" badge, you must book signed in to the same account, the difference must be $5 or more, the total is capped at $500 per account per calendar year, and payment goes through Google Pay after the first flight is flown (Google Price Guarantee terms). If the flight you tracked has no badge, no refund applies however far the price falls.
When Google's tracker is the right tool
It is free, it is attached to the most complete fare search most travelers use, and its "likely to go up" emails are genuinely useful near departure. For a trip more than two months out with flexible dates, "any dates" tracking is a good passive baseline. Its limits are that it is silent by design on small moves, it cannot take a target price, and it does not show you a dated record of what the fare has been. For a side-by-side of the alternatives, see flight price alerts compared; for a method to decide whether a given price is worth taking, see Is this a good flight price?.
FAQ
How often does Google Flights check tracked prices? Google's help page does not publish a schedule. It describes emails on significant changes and, for "any dates" tracking, a monthly email.
Can I get Google Flights alerts by text message? Not according to Google's help page, which describes email updates only.
Why did I get a "prices are likely to go up" email but no "price dropped" email? They are different triggers. The increase warning comes from Google's prediction system and fires on expected changes; the drop email requires an actual significant fall in the tracked price.
Does tracking a flight lock in the price? No. Tracking only sends emails. The only price protection Google offers is the price guarantee on badged itineraries, with the caps described above.
Can I track more than one route? Yes. Each tracked route or flight appears on the Tracked Flights page with its own notification toggle.
Sources
- Google Travel Help: Track flights & prices: https://support.google.com/travel/answer/6235879
- Google Travel Help: How to find the best fares with Google Flights: https://support.google.com/travel/answer/7664728
- Gmail Help: Legitimate messages marked as spam: https://support.google.com/mail/answer/1366858
- Google Price Guarantee Additional Terms of Service: https://travel.google.com/intl/ALL_us/flights/guarantee/terms/
- Google blog: 3 ways to find a great deal with Google Flights: https://blog.google/products/travel/google-flights-find-deals/
- Google blog: Holiday travel trends and insights for 2025: https://blog.google/products/search/holiday-travel-trends-2025/