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, …