for flights, use: www.skyscanner.com
Inputted Toronto Pearson to TPE (Toronto).
Depart April 2, Return April 16
Hit “Search flights”
It searches for about one minute.
Comes up with $640 as cheapest.
Look at top-left above “Get Price Alerts”, you’ll see “Show whole month”. Click on it.
Lo and behold, you’ll can change to April 17 ($297) and go down to $595.
Some dates have “?” marks. Just manually change dates (by going back to first original webpage to change dates). You may be surprised at getting even much lower. I have done this myself and seen one day pop up at like HALF the costs of all other days (and subsequently bought that price for the tix) . Air Canada, too. Nice 787 new planes they fly to Asia.
So, pick a # of days timeframe and start manually checking earlier/later.