Experts say the best time to book a holiday is on a Tuesday morning at 10am.
That's because airlines release their last-minute deals for the following weekend on this day - sending competitors scrambling against each other for the best prices, and your custom.
See also: The cheapest holiday destinations 2017
See also: This is the cheapest month to book your 2017 holiday
Bookings comparison website Skyscanner also says travellers hoping for a bargain should aim for anytime before 11am.
Tuesday is the day companies adjust their prices - especially if holidays aren't selling. Book early and you'll get last night's prices, search after lunch and the prices will have been updated.
Meanwhile, Tuesday, Wednesday and Saturday are the cheapest days of the week to fly out according to ComparetheMarket. Travel on a Friday or Sunday and you may find you're paying well over the odds, for the exact same journey.
And, if you're travelling in a group, 47-days is the latest you should leave it before booking your flight, otherwise you risk dealing with not only a spike in prices, but scattered availability - and sold out seats.
It's not all about time...
But it's not just the date and time that can add to your spending. According to ComparetheMarket.com, the more you browse a holiday deal - the more you could end up paying.
Why? Some airlines check to see if you've visited before and what you looked at - using browser cookies - in a process called 'dynamic pricing'.
It's the supply and demand model - and how much of the economy works. But, a simple wipe of your browser history and cookies could save you paying out more - and it takes just 11-seconds.
How to clear your browser history
Internet Explorer 11 is the last version of Microsoft's web browser.
To delete your history, click or tap the cog icon at the top right. In older versions of the browser, open the Tools menu instead.
Now choose 'Internet options' and, in the 'browsing history' section, click or tap the 'delete' button. Tick the boxes to choose what to delete then click or tap 'delete'.
In Windows 8.1 click 'settings'. Click 'options' and scroll down the list to find 'history'. Click 'select' and tick the 'browsing history' checkbox and click 'delete'.
If you're using Firefox, open the menu by clicking the button that looks like three lines on top of each other. Point to 'history' and then click 'clear recent history'.
For those on the Chrome browser, click 'Ctrl+H', this will open a 'history' tab. To clear your cache, click the 'clear browsing data' box and select 'cookies and other site plug-in data'. Once done, hit 'clear browsing data' to clear your history.
If Safari is your usual browser, you can clear your history by clicking 'Safari' in the upper left hand side of your screen. In the menu that appears, click 'preferences', followed by 'advanced', then click 'show develop menu in menu bar'. Once done, click out of these pages, hit the 'develop' button on the top of your Mac and hit 'empty caches'.
More clever holiday hacks to help save you a small fortune
Don't just settle for the airlines you've seen on the TV, or the popular firms running the skies. The deals are hidden in the research - so when you're planning your next break, find out which airlines are running the sales first.
For flights-only bookings, low-cost airlines like easyJet and Ryanair (which often has fares from a fiver) are safe places to start - these airlines mostly travel to Europe. If you're venturing further afield, and are willing to compromise price and a stopover, Wow air and Norwegian will fly as far out as America, for less than £150 return.
Travel insiders also recommend Google Flights for holiday hunters. This clever tool offers flash alerts when prices are about to skyrocket, and flags the flights offering the biggest bang for your buck. It's like having your very own travel agent say: "If I were you, I'd do this."
If you're after inspiration, Google Flights also has a handy 'I'm feeling lucky' tab which will bring up the best deals right now. The handy "tip" bar also lets you know how much money you'll save if you're willing to fly earlier, later or from a different airport.
For complex trips like honeymoons and luxury getaways, get a feel for pricing by heading to a few local travel agents. This will give you a good indication of whether the deal you've found online really is good or not, and you'll get an idea of the additional costs to factor into your budget.
There are also ways to make money out of your holiday. Cashback websites like TopCashback and Quidco are free to join - and will pay you to shop through them. So next time you're booking, have a quick search of the rates and the amounts you could earn through booking online.
If you can avoid travelling at weekends you're likely to be able to shave more off the price. Flights in the afternoon are often cheaper and Tuesdays are regarded by travel insiders as the best value day to fly.
For peak holiday seasons, professional flight hacker Jack Sheldon recommends looking just as the flights start showing up (typically 11 to 12 months in advance).
For example, if you looked in September 2016, you could find a ton of cheap fares to all sorts of southern Europe beach destinations for less than £50 for August 2017.