Online travel company Kayak just may have saved bargain hunters everywhere time and money by releasing an in-depth guide for booking travel in 2018.

Created from data compiled in 2017, the guide shares the least and most expensive days to travel throughout the year, breaking down the median price for international and domestic travel by month and day. Looking to score a deal on an international flight in February? Kayak predicts that February 3 will be the best day to fly. It’s likely that February 5, on the other hand, will be much more expensive.

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The guide also shares how far in advance you should book travel to get the biggest bang for your buck, with domestic and Caribbean travel only requiring booking one month in advance while travel to Europe and Africa should be done six months in advance.

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Guadalajara, Mexico tops Kayak’s list of the most wallet-friendly destinations to visit in 2018 based on median airfare and hotel rates, with Calgary, Canada and Raleigh, North Carolina also making the list.

View Kayak’s full guide here.