YCombinator-funded Adioso today launches its third iteration as an online destination for adventurous travelers who want to take vacations but are not constrained by specific days or even places. Yes, the online travel space is saturated, but the more mainstay search services like Kayak and Sky Scanner only let you find specific dates and destinations, failing if your desire is more vague.

In contrast, Adioso allows you to search flights with complete flexibility, like if you want to go somewhere in Europe in November but are not committed to specific area or time. Examples of the natural language-enabled broad or open-ended searches specific to Adioso:

Chicago to Boston next week

San Francisco to Europe late September under $800

San Francisco to anywhere

Says founder Tom Howard:

“There are really no other services that let you know where you should go, and what days are the cheap days. You go to a website and you’d spend two hours trying to find the cheap deals, there was nothing that said these are the good days at this location.”

Before Adioso, the only solution to the “What are the good days at this location?” kind of query was to manually do separate searches on different sites until you stumbled across what you were looking for. Adioso’s model necessitates some programming chops however, as open-ended search is harder to enable than constrained.

Future plans include expanding the service’s airline and destination inventory as soon as the Adioso platform has stabilized, currently Adioso only covers a selection of airlines in Australia (the home country of founders Howard and Fenn Bailey), Asia, Europe and the USA.

Howard and Baily hope that service will create opportunities both for casual travelers (the most rapidly growing segment of the travel industry) as well for airlines who are looking for ways to best monetize left over seats on undersold flights.