Once you have decided on a flight you should then think about choosing your seat. Not all seats are created equal. Once you check out the seats you want, you might want to pay any additional cost, if is one, and book the seat you want right away. It may be worth it in the end to pay a fee and get exactly what you want.
If you don’t book ahead you may just be playing roulette with the seats that are left when you arrive at the airport. And I don’t just mean that you may get a middle seat. Different seats have features that are or are not desirable for various reasons. Say for instance you really want a window seat so that you can look out and take photos. You could get stuck with one of the off centered seats where the window is not lined up with your seat. Also knowing that some seats do not recline or that some have more leg room than others is useful.
To order to help reduce any effect from turbulence, aim for as close to the wing as possible. This is helpful because the wing is the pivotal point of the plane.
Bulkhead seats (those immediately after the division between first class and economy) have advantages like a bit more leg room, and earlier exit when you land. Sitting in front of the exit rows can be good as well. Since people have more legroom on the exit rows they are less likely to be digging their knees into your seat. You may want to avoid the exit row itself, in some airplanes there are more disadvantages than perks to being there. Although you have more leg room you may not be able to recline and you can’t keep your hand luggage with you.
Sit on the left hand side of plane for night flights because on most airplanes the seats on the left are offset from the window by a few inches which could give you a bit of extra head room if you are in a window seat and want to lay your head there.
Avoid the last two rows if possible. Most aircraft are narrower at the rear so you may have a bit less elbow room, plus you have the washrooms in the rear which are usually busy. Also airlines tend to sit families together near the rear when they can so it may be a bit noisier. Another point is that the crew luggage is sometimes using the overhead bins at the rear.
When booking as a single traveler try to plan for an empty middle seat. This is done by booking the window seat if the aisle one is taken and vice versa leaving an empty middle seat. For a couple, book the aisle and the window leaving the middle empty. Most people will avoid booking that middle seat if they can help it so if the flight is not full this could end up with an empty seat in the middle. It is worth the chance. For a couple, if the seat does end up taken usually the person is more than happy to trade out for either the window or aisle one.
Enjoy your flight and have a wonderful trip!