Follow tweets and news updates
Every airline company has a Twitter were they post their promotions and deals. You can find good deals on holidays and anniversary events.
Airline email alerts
Every airline has its own email subscription service. There is an option to subscribe to deals and price alerts. If you are looking for a specific flight/trip, you specify that online and it will constantly email you with an update of prices.
Buy ahead of time
You want to start a search for airline for any trip you are planning in the near future. The earlier you request dates, the cheaper the tickets will cost. The longer you wait, the more likely spots will be taken. Also make sure to buy tickets on Tuesday at 3p.m. ET, this is when sites upload most discounts.
Kayak’s price overview for planning
Kayak has a great tool that shows the daily prices for 1-way tickets. You can use this to find which days in a month or which months to aim your travel for. Use this and plan to plan your next trip.
Priceline’s “Name Your Price Tool” for last minute travel
If you are looking last minute, you can try Priceline’s Name Your Price tool, they will show the prices of recent purchases, which you can also use as a guide.
More tips at: Mashable Airline Discount Tips