Google just updated its advice on when it's best to book flights - and the data paints a bigger picture

Follow ZDNET: Add us as a preferred source on Google.

ZDNET's key takeaways

• The ideal booking window for domestic flights is approximately one to two months prior to takeoff.
• You should plan much earlier for overseas travel to secure the most favorable rates.
• Flying earlier in the week, specifically on Tuesday, can result in consistently lower ticket costs.

The last time I booked a vacation flight, I spent over an hour searching for the cheapest ticket to Hawaii, with two criteria in mind: it had to be a direct flight and have only one layover. At least one layover was to be expected (at LAX) because Kentucky is a long way from the Aloha State. I could've saved some time, though -- and money -- had I known what Google's latest Flights report revealed.

What is the cheapest day to fly?

Based on Google Flights' latest ...