Want to get the cheapest flight possible? You're not alone. We're always trying to lock in the most inexpensive price for airline tickets whether it's to visit family or for that next great vacation.

Getting it, though, has become a little easier, thanks to the internet. With online travel agencies and discount providers taking the place of traditional agents, it gives us access to a wider range of prices and options all at our fingertips.

When Are Airline Tickets Cheaper?

Plane tickets usually don't get cheaper closer to the departure date. Flights become more inexpensive when you book between four months and three weeks prior to your departure date. And according to the CheapAir.com 2018 Annual Airfare Study, you can expect rates to go up after that period. There may, of course, be some compounding factors that can affect this. Seasonal changes, holidays and other factors can impact pricing at different times, too.

Here's a look at how airline prices tend to move, according to the study.

The Volatility of Airfare Prices

Each year, discount airfare company CheapAir.com analyzes millions of flights and ticket prices for its study.

For its 2018 study, the company looked at fares for more than 917 million flights in 8,000 markets. The results show volatility is the main reason behind the prices of flights.

The company found that the price of tickets for one trip changes an average of 62 times during the sale period. Those price fluctuations average $36 each time. This variability is ultimately driven by supply and demand.

Six Booking Zones

From its extensive analysis, CheapAir.com identified six booking zones for airfare, based on the number of days prior to departure and what to expect during each of them.

  1. First Dibs (169-319 days in advance): You'll pay about $50 more during this period than if you waited to get the lowest airfare. The positive during this period is that you'll probably have more choices when it comes to itinerary and seating.
  2. Peace of Mind (122-168 days in advance): Tickets cost about $20 more during this period than if you waited for the lowest airfare. Still, there are plenty of good options for seats and flights.
  3. Prime Booking Window (21-121 days in advance): Airfares average within 5% of their lowest prices during this period. It's the ideal time to hunt for bargains and book your flights.
  4. Push Your Luck (14-20 days in advance): Fares often rise during this time. The most convenient flight options are sold out and the best seat options are already taken. But you may luck out and find some lower fares during this period.
  5. Playing with Fire (7-13 days in advance): The pricing during this period is on average 22% lower than it would be if you waited until the last minute to buy your tickets, but it's still not the ideal time to buy. Flight and seat choices are also much slimmer by this time.
  1. Hail Mary (0-6 days in advance): If possible, you should try to avoid booking flights during this time period unless a last-minute emergency arises. You'll pay an average of $208 more than if you had booked during the "prime booking window."

Seasonal Considerations

The general recommendations CheapAir.com lays out in the six booking zones can be helpful guidelines for buying plane tickets. But the company points out they may change somewhat depending on the season.

  • Fall: You can usually wait a bit longer to book fall travel and still get decent deals. The exception is Thanksgiving week. The best time to book travel during that week is usually 69 days in advance.
  • Winter: Travel around the Christmas and New Year holidays will usually cost more no matter what, but otherwise, winter can be an affordable time to travel. For non-holiday travel, aim to buy plane tickets 62 days in advance. 
  • Spring: Many people travel during a wide range of days for spring break, so the key for travel during this season is to plan ahead. If possible, buy your tickets 90 days in advance.
  • Summer: This is the most popular season for American travel. CheapAir.com recommends buying your tickets 47 days in advance during this time.

The Bottom Line

While you shop around for the best possible flight, remember the tips and windows of time laid out by CheapAir.com above. But you should also remember one more thing: When you spot a good price, take it. If you wait, you may be costing yourself more money in the end. The longer you wait, the more you'll end up paying, which may not be good for your budget.