Grab any piece of paper, almost all will work, as long as it is rectangular. I used printing 8.5" x 11" paper for it's availiability although same size notebook paper will work just as well. Fold in half hot-dog style. This is the most important fold because if this is uneven the rest is uneven as well, causing spinning. Start out by lining up the corners and folding there, then sliding your hand across the bend and folding along the way.
Step 2: 2nd Fold, Corners
Holding the paper like the picture from the last step Fold the top left and right corners to the middle.
Fold the new side you made with the last fold to the middle, holding the flap below it at the middle dividing line to keep both folds even.
Fold in the middle to make the side you just had on top be facing out. Then fold the two flaps you just made (like the front and back cover of a book) to the "spine" of the book, or to the first fold you made on the paper.
Now fold the newest flaps you made back to the top of the airplane so that when you look at it from the back it looks like the second picture.
Fold each side of the airplanes whole top half to their respective bottoms covering all previous flap folds.
Open up all previous flap folds like the picture below.
It should be ready now. Now results may vary but when I threw it I got about 25 feet on average but you might get better by using different paper than just regular 8 1/2" by 11" white printing paper, adding small folds on the ends of the wings, or folding the nose of the plane inside to protect it when it crashes.