4. Choose two different airlines.
It takes a little research, but sometimes booking two one-way tickets will cost less than a round-trip. Plus, it might make scoring better departure times easier. Some online booking engines mix-and-match already, but by doing a quick scan of each airline's site on your own, you could end up scoring the very best deal.
5. Fly on Tuesdays and Wednesdays.
Generally, these are the least expensive travel days for domestic flights — with Friday and Sunday being the most expensive. On average, the difference can be up to $58 round trip. So if you're flexible, you can save enough money to treat yourself to a fancy lobster dinner once you arrive at your destination.
6. Use a travel agent.
Apparently, these professionals have access to special rates that we normal folk do not. To make sure you're not duped, do your own research first, then see if they can match or beat your findings.
7. Break up family purchases.
Since airlines limit the number of seats per flight they sell at the lowest rate, you might end up pricing yourself out of the deal if you try to book too many people at one time. But don't worry: You can still fly together. Just check what a solo ticket costs compared to the full group rate. If it's way lower, buy seats in smaller groups on the same flight.
8. Follow your flight afterwards.
Who knew most American airlines let you claim a refund if the price of your flight drops? Jeff Pecor, communications director at Yapta.com, an airfare tracking service, told Fly.com: "Not many people know the policy even exists — nor do they bother to check the price of their ticket after purchasing it." To track this, enter your flight into Yapta after booking your trip.
9. Use the 24-hour refund policy.
In the fine print on most airline tickets, you'll see that you can cancel your flight up to 24 hours after booking it — after that, you're out of luck. During that fleeting time, keep an eye on prices. If they drop, act fast if you want to save without penalty.
10. Change your departure on the day-of.
Doesn't it drive you crazy that the most affordable flights are always the most inconvenient? If you're feeling risky, go ahead and book the cheaper option if you're flying JetBlue or American. They charge lower fees for same-day changes, so if there are still seats on the better flight you can make the switch.