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.

Travelocity.com: Travelocity, as far as we know, was the first travel agency site to offer a fare watch system. Once upon a time, it tracked both international and domestic fares, but now only covers domestic/Canadian deals. To use it, go to the "Flights" tab and then to "Low Fare Alert" and then click on "Get email alerts" in the upper righthand corner under "Tools". You can sign up for alerts on up to five routes. On the Low Fare Alert page you'll also see a list of fares, from any given city, that have gone down in price from the previous day. Travelocity searches fares just once a day, however, compared to Farecompare's three times a day Monday-Friday.
Travel requires that you keep yourself updated with the latest flights status. Often, you would need to check the flights schedule of the airlines for a particular sector while planning your travel. In the age of internet, you can check the flights status and do the bookings far easily than ever before. Instead of running to the travel agent office or making frequent calls, you can get online with Yatra.com which provides an easy online interface to check out which all airlines are operating flights at what all times in a particular sector. We comprehensively cover more than 550 sectors within India, providing the latest sector-based flights information about the airlines operating in the area.
The member fares are typically specially negotiated fares — sometimes called "consolidator" fares — that are offered from time to time to various travel agents. You cannot book fares on Bestfares.com; rather you have to call a toll-free number to complete your purchase. But like Farecompare.com below, Bestfares.com provides a good barometer of where fares are at any given moment, and the fares are updated throughout the day.
Finding flight availability for getting from point A to point B is easy to do with the right tools. ExpertFlyer makes it easy for you to search for flight availability on a number of airlines, view fares for flights, check seat availability, connecting flights and so much more. Your membership makes your flight availability search simple and beneficial especially for the frequent flyer.
Buy an extra seat. One interesting tactic to find yourself some breathing room offered by Petersen might appeal to folks traveling on very cheap sale fares: buy two coach tickets. Say you find one of these $100 roundtrip fares to Florida or the like; the airlines that offer these usually make up the difference in fees for checked bags, movies, food and other extras. However, if you don’t need headphones or to check a second bag, you can skip all those charges, and get yourself a heap of legroom for $50 — less than the cost of most premium seats.
Airfarewatchdog – You can set up regular price alerts for favorite routes, but the real appeal for cheapskates with wanderlust is this site’s Top 50 Fares of the Day page. This tracks bargain airfares from Frontier, JetBlue, and other carriers prone to slash prices, as well as larger airlines. (Sample deal from earlier Wednesday: $40 for a roundtrip flight from Pittsburgh to Las Vegas). 

If you don't have access to a service such as Flight Alerts, check in with the airlines 24 hours prior to departure. If an upgrade is still unavailable at this point, check in online at the airline's Web site. Most airlines establish a waitlist for upgrades at the airport. Priority is usually given to those who have checked-in the earliest and with online check-in available 24 hours prior to departure; this will greatly increase your chances of getting that elusive upgrade.
Which, if any, of these sites allow you to say “please add the cost of extra legroom seats” on airlines A, B, and C but not on airlines X, Y, and Z, as you set up a fare alert? (On certain airlines, I get access to exit rows or extra legroom seats for free, while on other airlines I have to pay for that access. And as a tall person, that’s important to me. But that means the price without that added is irrelevant to me on those airlines where I would have to pay extra for the “decent” seat.)
Which, if any, of these sites allow you to say “please add the cost of extra legroom seats” on airlines A, B, and C but not on airlines X, Y, and Z, as you set up a fare alert? (On certain airlines, I get access to exit rows or extra legroom seats for free, while on other airlines I have to pay for that access. And as a tall person, that’s important to me. But that means the price without that added is irrelevant to me on those airlines where I would have to pay extra for the “decent” seat.) 

Farecast.com: This site is best known for predicting where an airfare on a particular route is going to go (up, down, or stay the same) over a period of time. But recently it, too, got into the fare listing game. From the home page, go to the "Airline Ticket Deals" section and you'll see a select, but not very extensive, list of fares from the airport of your choice. Unlike Farecompare, Farecast uses airfare data from Cambridge, MA-based ITA Software, which in our experience is more accurate than ATPCO's data. Farecast's fares show all taxes up front, but Southwest, Allegiant, Skybus and a few other airlines' fares are not shown.
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All of the sites allow you to search by preferred times but none to my knowledge allow you to set up alerts for specific arrival/departure times. Interesting idea to have sites sort flights by legroom cost, hadn’t thought of that and certainly have not seen it. Southwest used to have an alert tool called Ding, but no longer. You can include Southwest on Google flights but in its search results it only shows scheduling, you’re redirected to the Southwest website for pricing. Sorry I can’t help you more with your wish list but I sure do thank you for your comments and questions.
Hopper’s signature rabbit may seem a bit childish at first, but this bunny knows its stuff. The flexibility feature is especially useful: put in your home city and desired destination and Hopper will map out the entire year for you with color-coded prices. The dates are shown as month-long calendars, with colored boxes telling you when prices fall into certain categories, like less than $300 or +$500. The app-only service also predicts whether or not the price for your chosen dates may drop or not (they monitor up to 15 billion flight prices per day) and allows you to “Watch the Trip” —  a feature where Hopper will send you alerts if the price changes. If you know you need a vacation, but are flexible on your destination or dates, you can also set alerts for the app to tell you when there are destinations deals. This app is free to download. 

Most cash bookings can be upgraded with Avios either at the time of booking or later on, depending on availability. Only the lowest economy (World Traveller) fares (Q, O and G) cannot be upgraded with Avios at any time. There must be reward flight availability in the next cabin for you to be able to upgrade to it using Avios. You won’t be able to upgrade with Avios at the airport or on board.
The second upgrade tip is to check the upgrade availability frequently. Although upgrade seats may not be available at the time you purchased the coach ticket the inventory for upgrades is constantly changing, right up until the time of departure. You can check with your airline every day or several times a week or you can use an alert service from some online services such as ExpertFlyer.com. ExpertFlyer.com now offers Flight Alerts, a service that allows you to program your actual flight or series of preferred flights for an upgrade or award. Flight Alerts will automatically search for open availability and notify you immediately once it locates a seat. The notification can be sent to three (3) different addresses including personal or work email, cell phone or PDA so no matter where you are or what you're doing, you will be notified the moment Flight Alerts finds the Premium seat you're looking for. Flight Alerts, or a similar notification program, can also assist you in finding seats using only awards miles.

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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