When requesting an eUpgrade to Business Class, you will always be offered the option to sit in the best available seat. For instance, if you originally requested an eUpgrade to Business Class, but there are no Business Class seats available at flight departure, and seats in Premium Economy are available, you will be offered a seat in Premium Economy. The eUpgrade requirements will naturally be adjusted accordingly.
For example, United flights on ExpertFlyer only show I (business class), X (economy) and O (first class) availability; these award classes are standardized across all Star Alliance partners. However, if you have a cobranded card (like the United Explorer Card) or hold United Premier elite status, you have access to additional award inventory that doesn’t appear on ExpertFlyer. You should search United.com for award seats available to you:
When requesting an eUpgrade to Business Class, you will always be offered the option to sit in the best available seat. For instance, if you originally requested an eUpgrade to Business Class, but there are no Business Class seats available at flight departure, and seats in Premium Economy are available, you will be offered a seat in Premium Economy. The eUpgrade requirements will naturally be adjusted accordingly.
If I had to award a ‘peoples choice’ in this category, it would go to Hipmunk. It does almost as good a job of finding and tracking information on flights as Google Flights, but delivers it inside a better design, displayed according to the ‘agony factor’ of the flight (a combination of time in the air, departure and arrival times, cost and layover), in a beautiful interface.

The other nice thing about the results page is that it’ll show you connecting options (as long as you don’t limit it to nonstop flights at the outset), though bear in mind that every leg of a one- or multi-stop itinerary must have award availability in the desired class of service in order to book the entire trip with miles. Remember too that most award seat availability shown on ExpertFlyer will be at the saver level for all programs. This is nice in that it should be bookable using any partner program’s currency, but it won’t show you the expanded award inventory that’s sometimes available through certain programs.
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.
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.

Yapta.com allows you to set up an alert for a specific flight. They call it a “refund” alert, since they set it up for watching a flight you’ve already booked but want to know if the price drops in case it’s with an airline (such as Alaska in my case) that gives refunds without fees if your price drops after booking. However, they don’t actually check whether you’re on the flight, so you could use it to simply watch a flight that you’re interested in but HAVEN’T YET booked. This wouldn’t be practical if there’s a wide variety of flights flying the route you want on the day you want in the time span you want, but in those cases where there are only a few flights that fit your needs, it might be practical to use this feature at Yapta.com to set up a fare alert for those specific flights.
If the flight is relatively empty, your chances are slim. Even though seats in business class may also be empty, the airlines don’t usually upgrade people for no reason. If the flight is full, your chances are better. Airlines carefully plan how much they oversell flights, and their inventory departments are not upset if people need to be upgraded to accommodate everybody on the flight. Therefore, on a full flight the airlines sometimes are forced to upgrade people. In this scenario, if you have a good story, you may be lucky. Remember, of course, that business or first class may already be full from prebooked elite-level upgrades.
Also, ask about availability at check-in, particularly on international flights, where the check-in agents sometimes have more control over the seating chart. Then, if seats appear to be available, check in again at the gate. The final, “miracle” upgrades always happen at the last minute, when all passengers are checked in and any remaining availability becomes clear. Make sure you are within earshot of the gate desk, although hovering over agents is not recommended.
Within Momondo’s flight results, there are tabs across the top of the screen that let you move between the cheapest flight, quickest flight time as well as options for ‘early out’ and ‘late in’.  The results are extremely easy to read and feature all the information you need at a quick glance, including the carrier logo and total transit time. When you click on one of the them, you are quickly forwarded to the airline’s website.
Sites in this latter category, which is growing at a rapid clip, may include a search component, but they also provide a list of low fares and/or alerts about such fares, either delivered by e-mail or posted online. They're ideal for people who are just looking for somewhere cheap to visit, or who are hoping to travel on specific routes but want to buy when fares are at their lowest. In alphabetical order, here are 10 of the best.
Sometimes you might be planning a trip but can’t fully commit to buying the tickets just yet. Price Alerts let you monitor the price history of your chosen flight so you can pounce if the airfares suddenly start to creep up. Or perhaps you want to go away on a specific weekend but the flights are far too expensive. Set a Price Alert and you’ll be sent an email immediately if there’s a price drop. Flight prices change frequently, but Price Alerts mean you won’t be caught on the hop if flight prices skyrocket – and you won’t miss out on a deal if prices plummet.
Airline computer booking systems have become so sophisticated that most upgrades are doled out based on a complex brew of data, and it’s now much more likely that a computer (rather than a helpful airline agent) decides if you get an upgrade or if you are stuck in a middle seat in the back of the plane. This article includes a couple of interesting graphics on how Delta and United assess upgrade eligibility.
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.
Travel providers like to speculate as to the best time to purchase an airline ticket. Many even claim that certain days of the week are better than others. The IOS and Android app called Hopper has the data to support such a claim, however, and even Apple even named it one of the best apps of 2015.  Hopper’s application uses their accumulated data to predict and analyze airfare. The app will notify you when prices for your flights have hit a low point, according to their algorithms. They’ll also warn you if waiting to purchase may bring a better fare.  Just download the app, do a search for an airfare, and set up the alert. Hopper will track it real time and notify you about changes and purchase recommendations.
All regulations apply to Eurowings flights with an EW flight number, regardless of the operating airline. For our partner airlines' flights, which do not have an EW flight number, the conditions of the respective airline apply. These can be viewed on the airlines' own websites. These partner airlines currently include Lufthansa, SWISS, Austrian Airlines, Brussels Airlines, Condor, United Airlines, Air Canada and All Nippon Airways.

If your itinerary is botched or implodes for some reason, particularly if it affects only you and no one else (such that the airline is not trying to accommodate lots of folks in the same situation), your case for an upgrade on a subsequent flight becomes more compelling. The airline is not obligated to upgrade you, but if this happens, pleasantly but firmly let the gate agents know that if an upgraded seat is available on your rebooked flight, you would greatly appreciate getting that seat.
Certainly it wasn’t all chance that brought first-class upgrades floating one’s way, and a heavy battery of hard and soft tactics arose to increase your chances. Dress neatly, speak politely, fly the same airline regularly, inquire when offering your frequent flier number to the telephone booking person, stand a little taller at check-in if you can (for the tall-person sympathy upgrade), volunteer to give up your economy seat so a family might sit together, volunteer to be bumped on an overbooked flight.

The way you dress could be the extra push you need to get your first-class seat, the Huffington Post says. The day you’re hoping to upgrade is not the day to wear flip flops and ripped jeans. According to Bankrate, if there’s a seat open in first class, it’s most likely going to the person who’s dressed like they should be sitting there. No need to go overboard with a full suit — nice and neat will do.

Setting the benchmark for ease of use and functionality, Google Flights has become a go to flight search tool for any travel that doesn’t require the advanced routing and functionality of ITA Matrix. Tracking across multiple dates, destinations, and cabins, Google Flights will let you track individual airlines or alliances, choose the number of stops, and will wrap up any changes into an easily digestible email showing which prices have dropped/risen. If you have Google Now, you can have the price changes sent directly to the app, or you can see all tracked flight in the drop-down on the left of the Google Flights homepage.

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