These days, air travel seems pricier than ever (and that the amenities less amenable than ever). Would you believe, though, that when you adjust for inflation, airfares have actually fallen by about 50 percent in the past 30 years? It’s true, according to a chart-filled article in The Atlantic.

English: Airline Ticket Receipt of Southwest A...

English: Airline Ticket Receipt of Southwest Airlines (Photo credit: Wikipedia)

That’s no consolation to the average passenger, though. Paying hundreds of dollars just to get from Point A to Point B — often with nary a free bag of peanuts to soothe them — leaves many travelers with a bad taste in their mouths.

But perhaps even more frustrating than the high price of air travel is the constant change in exactly how high they’ll be. That’s because there are many factors, some not even remotely related to the airlines themselves, that determine what your airfare will be. And some of those factors change by the day.

Here’s a look at three of those factors, drawn from a Fox News article on the “9 Surprising Factors That Influence The Price Of Your Airline Ticket.”

  • The Price Of Oil: Gas prices ruin everything, from the cost of your daily trip to the office to the price tag on your plane ticket. Fuel has been airlines’ No. 1 operating expense since 2011, and so airlines keep adding fuel surcharges to the price.
  • The Timing Of Your Flight: Convenience is costly. So is flying when everyone else wants to fly. That’s why it can be extra pricey to fly on major holidays, spring break and even dates like the Super Bowl. The least-expensive days to fly: Tuesdays, Wednesdays, and sometimes Saturdays.
  • The Government: Yes, there really is a Sept. 11 Security Fee. It’s rising to $11.20 per round-trip flight later this year, and that’s on top of the taxes and other fees airlines tack on to the price of your ticket to pay the government.
  • Strike A Bargain: Looking for your best bet on ticket prices? Several websites, including Fare Detective, Kayak and even the search engine Bing now offer historical fare comparisons that will let you know when it’s “safe” to buy.

What’s the best deal you’ve ever gotten on a plane ticket? What’s the most you’ve ever paid? Share your booking tales with us in the comments section.