Order your Amazon gifts by this date if you want them shipped for free by Christmas

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Christmas is on a Monday this year, so it pays to think ahead when ordering online to ensure none of your gifts will be waiting in a post office rather than under the tree come Monday morning.

Fortunately for those who prefer to shop online, most stores offer transparent "buy-by" dates that come with guarantees that your item will arrive by December 25, 2017.

Amazon is one of those retailers, and you can find the important dates you'll need to buy by for pre-Christmas delivery below. It's good to note, though, that the following calendar applies only to the contiguous US and varies by item. To be safe, check the delivery date at checkout to be sure.

• Friday, December 15: Last day for free shipping.
• Monday, December 18: Last day for standard shipping (free on qualifying orders for Prime members).
• Friday, December 22: Last day for Prime free two-day shipping (no minimum order required).
• Saturday, December 23: Last day for Prime free one-day shipping (in select areas, $35 minimum order value. Learn more).
• Sunday, December 24: Last day for Prime free same-day delivery (in select areas, $35 minimum order value. Ends at 9:30 a.m. local time or earlier. Learn more.) Also the last day for free two-hour delivery with Prime Now (in select areas, varied minimum order values, ends at 9:45 p.m. local time or earlier. Exclusive to Prime members. Learn more)
• Monday, December 25: Give the gift of a Prime membership or email a gift card.

Finish your holiday shopping at Amazon today!

Having trouble figuring out what to get someone for the holidays? Browse all of Insider Picks' 2017 holiday gift guides here.