Getting the best airfare for your trip is one of the most important aspects of planning air travel be it for business or for pleasure. This makes Travelzoo a good fit for people with a budget and time frame, but no firm idea of when or even where they want to go. The downside is that if you do have specific plans in mind—for example, you need a flight to Omaha in March—Travelzoo is not likely to be helpful.

Though in our tests it stumbled a few times on last-minute quotes—how did it miss so many direct London-Barcelona flights on Ryanair, easyJet, and Vueling that all the others found?—it did stellar work on fares six weeks out, either tying or beating the results of our #1 site.

Kayak claims that consumers booking two one-way tickets are usually paying less than they would if it were a regular round-trip flight.” Moreover, data show that this tactic is becoming increasingly popular: The percentage of one-way tickets sold (out of all ticket sales) grew from 29 percent to 42 percent between 2014 and 2017, according to the ARC report.

Hipmunk has always thought outside the search-results box, starting with its unique bar graph presentation—you can see at a glance, in clear graphics, the relative flight lengths, departure and arrival times, stopovers, and Wi-Fi availability of all the results.

They offer travelers the chance to skip out on things usually included in a traditional fare, like access to the overhead bins, the cost to carry on, seat assignments, and even printing your boarding pass at the airport; each of those counts as an add-on, and comes with a fee attached.