Setting up airfare alerts can definitely help save you money when booking flights, and luckily there are dozens of sites that offer such a service — but finding one that fits your preferences can be challenging. Here are ten sites that offer alerts to help you determine the right time to buy your tickets, alert you to new deals you might want to consider, allow tracking of a specific flight, and some that will even forecast price trends.

You can find almost anything you need to know about airline schedules, seat maps, flight statuses and more using ExpertFlyer, but today’s guide is focused on one functionality: searching for award and upgrade space. The platform currently allows you to search for this inventory on nearly 90 different airlines, though the exact fare classes vary from carrier to carrier. Carefully review the list to see what inventory is available for your desired airline — American, for example, shows both award and upgrade space for its flights, whereas Delta upgrade space was removed several years ago.


The FareIQ feature is unique amongst all tracking websites in that it will also track your flight after purchase and send a notification if the price drops, as you could be entitled to a refund from airlines that will refund the difference when the price drops. It pays to know the refund policy of each carrier in this case, as that could be the difference between getting a refund or not. 

Airfarewatchdog.com: This is the only site in the group that lists and compares fares on Southwest Airlines (now the largest domestic carrier based on passengers boarded, but one that refuses to pay sites to send it traffic), as well as those on low cost carriers such as Allegiant and Skybus, which sell fares only on their own Web sites. Whereas the other sites listed here use computer programs to evaluate fares, Airfarewatchdog uses people, who actually test if seats are available at the fares listed (sometimes airlines file fares for which very few or no seats at all are available, which is very naughty of them). 

If your specific fare class qualifies you for an upgrade if a seat becomes available, you may receive offers by email or text to purchase (most often in cash but sometimes for miles) the option to upgrade as flight time approaches and seat availability becomes more clear. These tend to disappear quickly, so if you miss the message, the seat won’t last long.
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Not such a long time ago — and a very good time it was, some say — a “surprise” upgrade wasn’t the rare thing it is today. In fact, if you traveled enough, it was almost just a matter of time before a check-in or gate agent, or even a flight attendant, slipped you a boarding pass with a very low row number — a golden ticket of sorts for many travelers.
With a few extra functions and a smarter user interface, this combination will be the best flight tracking tool in the market. The ability to track your flights after purchase and be notified if there is a chance of a partial refund has the potential to save a lot of money and adds a layer of value the websites on the list don’t have an answer for.
ITA Software Classic Matrix Tool - This tool allows you to search for fares in different sales cities so that you can accurately plan purchases in any city around the world. Additionally it has an undocumented feature that allows you to specify specific fare buckets. If you want to, for instance, search for A bucket availability on the HKG-JFK route on Cathay Pacific you would enter the search as From: HKG:: cx+ / f bc=a and To: JFK:: cx+ / f bc=a. You can substitute the "cx" with the proper airline code for the airline you wish to check, and substitute the "bc=a" with "bc=X" where X is the fare bucket you wish to check. If you wish to check multiple booking-codes and not place any restriction on the airline format the request as JFK::/ f bc=x|bc=y|bc=z to check the x, y, and z buckets. Another undocumented feature is the ability to request multiple segments on specific carriers (useful for mileage runs). If you want to travel from Los Angeles to New York and take 4 American Airlines segments, you would enter the departure city as LAX::AA AA AA AA and the destination city as JFK::AA AA AA AA. This will search for a 4 segment connection in each direction on AA. You can also force connections in specific cities. So, for instance, if you wanted to connect in STL from LAX to JFK on American Airlines you would enter the departure city as LAX::AA STL AA and the destination city as JFK::AA STL AA You can find the syntax by clicking "advanced routing codes" and then clicking on the little question mark next to the routing codes box. There is also a useful discussion of how to use this tool to the fullest on Flyertalk.
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