飛行時間！

You can try the airlines websites as they would have the information youy needed...
But you can also use the following website, if you type in the 2 airports code, they will show you the distance and the estimated flight time between the destinations...
http://www.airportcitycodes.com/aaa/T&DCFrame.html
Having said that, the estimated flight time shown here doesnt include things like head/tail wind, they just caculated the estimated flight time by the distance and the speed of the jets... Excluding all exterinal factors...

The flight time will be different due to the weather and the flight route

由A地方到B地方的所需的航程不是不變的；其實，受航道上有空事演習、順逆風或其他天氣等情況的影響而需改變慣常用的航道，航班所需的飛行時間是有改變的可能的。所以，從A地到B地所需的時間不一定與從B地往A地的相等；而且，同一個目的地的所需航程亦不一定每次都相同。

You may visit my blog for reference

航空公司

同埋好難講,而且間間航空公司未必一樣.
有d航空公司有中途站,有d又直飛.

航空公司的website就有了