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Sunday is generally the cheapest day to book flights, and booking on a Sunday can offer savings of up to 19.5% on average compared with flight booking on the most expensive day, which tends to be Friday according to historical data*.

The best time to buy flight tickets varies based on class and destination, with premium domestic flights, for example, being most affordable 42 days before departure. Domestic economy flights, however, don't see price increases until 28 days prior to departure. If you're flying internationally, prices increase 56 days in advance for premium flights and 77 days in advance for economy flights, according to historical data*.

Fridays tend to be the cheapest day for flights, with savings of up to 19% on average compared with flights on a Tuesday, which is the most expensive day to travel*.

The cheapest month to fly internationally tends to be august, with savings of up to 40.9% compared with flights in January. For domestic flights, April flights tend to be cheapest, offering savings of up to 33% compared with flights in March*.

It's generally best to buy plane tickets before they start to increase in price closer to departure, which is about 56 days in advance for premium international flights. That extends to 77 days for economy class international flights. Domestically, premium air tickets should be booked no less than 42 days in advance, while economy flights tend to offer great deals 4 weeks in advance*.

To find the cheapest flights on Expedia, you simply input your destination and travel dates and sort the results by price. Our vast inventory of carriers will allows you to browse a wide selection of flights, and flexible dates will make it much easier to bring down the price. Expedia members may also earn rewards on eligible bookings, so be sure to take advantage of this free program.

The best way to get your airfare as low as possible is to have flexibility. That means being flexible not only with your dates, but also with layovers and connecting flights. Checking out Expedia's flight deals can also help keep your costs low. You can even search directly for flights under a certain budget, such as flight under $200.

Put your travel dates into the flight search, and you'll be met with all the available last-minute flights for your selected time frame. Sort by price, and the cheapest options will be at the top of the list. We even offer some last-minute special deals you may want to take advantage of, though it's not always guaranteed that a last-minute flight to your specific destination will even be available. That's why it's always best to book in advance.

To book with Expedia, you'll need to input your travel dates as well as your departure destination, whether it's flight from Melbourne or flight from Tullamarine Airport. Then, input your arrival destination and determine whether you want a round-trip flight, a one-way flight or a multi-city flight. Be sure to take advantage of the multiple search filters as well that allow you to sort your results by carrier, cabin class, budget and more.

Several important factors go into booking a flight, including the overall cost, the specific travel time, the luggage policy, the cabin class and the airline. Consider which airport you're travelling to as well. If you're taking a flight to San Francisco, for example, you'll have to determine whether a flight to San Francisco International Airport or a flight to Oakland International Airport would be more appropriate for your specific destination in the San Francisco area.

Given how often prices change, there is no singular cheapest destination to fly to, but flights to Singapore tend to be fairly cheap in general. Additionally, you'll find cheap flights to Bangkok to be fairly affordable.

If you're looking for warmth on your next holiday, flying to Broome tends to be fairly affordable. Flights to Fiji are an easy way to reach a comfortable paradise as well.

Yes, you may cancel any flight you've booked from your itinerary on Expedia. Many flights are fully refundable, depending on how far in advance you cancel. Every fully refundable flight will be marked as such on the search results page with green text, though be sure to check each flight's unique policies to determine how your booking can qualify.

Booking with Expedia makes the flight-finding process easy, thanks to the vast inventory of flights to everywhere and an array of convenient search filters. Of course, flights are only a portion of what Expedia can offer, as we additionally help with hotels, car hires and even activities in certain destinations. Booking more than one aspect of your holiday at a time can lead to some serious potential savings. Expedia Rewards members also earn points for every eligible purchase that can be put towards subsequent bookings for additional savings. Membership is free, and joining only takes a few minutes.