When comparing Kayak vs Justfly, the Slant community recommends Kayak for most people. In the question“What are the best travel search engines?” Kayak is ranked 3rd while Justfly is ranked 17th.
Ranked in these QuestionsQuestion Ranking
Pro Best prices
Pro Comprehensive results
Kayak searches hundreds of travel sites to find all the possible flights to ensure you don't miss out on the best options. They have the most comprehensive results out of the competition.
One of the biggest advantages of Kayak that most of their competitors don't have is the choice of where to book after you have found what flight or hotel you want. This means you are not locked into a single vendor and can compare the various booking fees etc.
Pro "Explore" is awesome for trip planning
Kayak has a feature called "explore" that lets you answer the question "Where can I go for how much?" Explore is a fantastic tool for initially planning out your trip while finding the cheapest flights.
You punch in parameters for a trip and how much you're willing to spend to fly there, and your options magically appear on a map. You could punch in, for instance, that you want a maximum-four-hour nonstop flight in January to someplace where there's a beach and the temperature is between 70 and 90 degrees and they speak Spanish, and you don't want to spend more than $500 on airfare; Kayak will spit back your options.
Pro Cruise searches
You can plan searches on cruise lines.
Pro Android and iOS apps
Support for both Android and iOS with a simple user interface.
Pro Alert and price drop notifications
Sign up for email and or mobile phone alerts on price drops for the saved trip.
Pro Save and store booked itineraries
Find by booking number and last name.
Pro Rental car search with multiple vendors
You can search and filter a pickup and drop off time for rental with drivers age range as a filter.
Pro Filter flights by number of stops
You can filter by one or more stops.
Pro Hotel options included in search
Every search has the option to look for hotels.
Pro Multicity/segment flight searches
You can add two or more destinations at future dates.
Con Dishonest about prices
There are a large number of complaints against Kayak questioning their honesty. It's frequently reported that after booking on the site and enter your credit card information, you will be told to call Kayak as something went wrong.
You are then given a higher rate, or sometimes charged the higher rate without being told.
Con Poor customer service
There are many negative reviews containing complaints of very rude and unhelpful Kayak customer service.
Con Car hotel and cruise search are separate
You can't do a search including all three at once or combined.
Con Targeted for North American users only
Results are tailored for North American users right now.