Ways to get cheaper airline tickets

Buy in advance.
If you already know when your trip is and you don't plan on changing the dates. Go ahead and purchase the tickets. You can even get insurance on some of them if you are not able to fly. Depending on the airline, they can be cheaper the earlier you buy.

Look for promotional codes.
Many airline companies offer promotional codes. You can find these on their website or by searching around on the web. If you plan on traveling very far, it can save quite a bit of money.

Get tickets from expedia.
Many websites, such as expedia.com offer tickets for a cheaper price. I suggest looking online at different sites like this and comparing to get the best deal. But make sure the web site you use is reputable.

Pick a good date.
Flying around a holiday can be more expensive than flying during an average day. So if at all possible to try pick a period where the tickets will not cost as much.

Buy coach.
Especially if it is a short flight. Because you will not be on the flight for that long and will save a good amount of money.

Sign up for a frequent flyer program.
By doing this you will be receiving frequent flyer miles that will be usable for a future flight. So after you have flown a few times you can apply the miles to save money on your flight or even receive a free.