Please advise on other resources or did I misuse the following sites? Example: My friend and mom want to travel from Hong Kong (ie origin) to Toronto (ie destination). My mom can leave whenever from Dec 2014 to Jan 2016 inclusive, but my friend wants to leave in Dec 2014 or Jan 2015. They'll travel in one direction only and not return to HK, but will buy a roundtrip if it's cheaper than a one-way ticket. This doesn't duplicate How can I do a “broad” search for flights? because I've already tried:
1. http://adioso.com/hk/hong-kong-to-toronto-ca-december: For one-way fares: The presentation uselessly shows only one week at a time. For roundtrip: Same problem as in 2 below 'For roundtrip'.
2. http://matrix.itasoftware.com: For one-way fares: Thanks to user Gagravarr, I thought to retry with Internet Explorer, on which prices did appear in the calendar, unlike in Firefox 34.0.5 which I first used.
For roundtrip: The 'Matrix Airfare Search' requires you to specify 'Length of stay', but this thwarts my goal to minimise the price, without any care or need for a specific departure and return date.
3. http://www.skyscanner.com: For one-way fares: Why are there magnifying glasses on certain dates (example), the prices for which are inefficiently revealed only after clicking on each date? Yet when I tried this yesterday, the website exhibited the prices normally.
For roundtrip: I picked 'Whole Year' for the dates. The first problem is that prices for departure and return flights are listed separately. Second, this pricing display (for ostensibly every day) is misleading, because upon choosing a specific departure date, the website immediately limits the available dates for your return flights, so the total fare can be costly.