The Top Online Travel Booking Sites for January 2014

Skift Take
2014 will be an interesting year to watch from traffic perspective. While Priceline Group has a huge lead, Expedia and Tripadvisor family will continue to duke it out.
Editor's Note: Late last year we started a once-a-quarter feature on top trafficked sites in various sectors in travel, using monthly data from SimilarWeb. We have found SimilarWeb’s traffic stats to be a relatively good barometer of web activity and much more accurate than other traffic comparison sites -- at least as far as proportional comparison goes.
We're starting 2014 by looking at the top online booking sites in travel. Keep in mind this does not account for direct sites of travel brands (airlines/hotels) themselves, which we have done in separate lists previously. Also, our threshold is roughly 5 million visits per month, and does not count any app activity, hence sites like HotelsCombined, Hipmunk and others don't show up.
Some observations on the list below:
Compared to our first look for October data last year, we're now grouping country sites of same brand together, to get a better sense of the scale.
Booking.com is still the king in travel, by a large margin over Expedia and TripAdvisor.
Adding up Booking.com's sister sites Priceline.com, Agoda, and Kayak, the Priceline family is the Sinaloa cartel of travel -- to use a timely phrase.
TripAdvisor.com is still bigger than Expedia