One of my favourite sites that lists out all the available flights between two destinations is Hipmunk. You can also look up hotel deals on hipmunk.com as well.
It is a very customer friendly site. They don’t have their own promotions or prices, they only provide information on flights from airlines on one page. Basically, you enter your “To and From” and the “Dates”, then it lists out all the available flights between the two destinations in a very comprehensive manner. It allows you to compare the prices between the different airlines in a user-friendly page.
The other feature I like about the listing is that it includes the taxes and surcharges, so you don’t have to guess what the actual price is.
Furthermore, when they list out the flight, you can click on the link and it takes you directly to the airline site.
The best way to find out is to give it a try. I just want to extend my thumbs up to Hipmunk and I hope they continue to customer friendly approach.