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For a lot of the far off destinations you are likely to be heading for during your gap year, you can't always (easily) avoid flying. It's often the quickest way to travel long distances and so if you are short of time or would simply rather maximise time once you're there, taking a flight will be your best option.
There are plenty of travel agents that can help you out whichever country you are flying to or even if you're planning a round-the-world trip:
Check out local airlines for that country, sometimes they are cheaper and are very handy if you are planning on taking any internal flights.
Here's a directory for a few country airlines: