Range: $7.00 per square foot – $15.00 per square foot.
As you can see, the price for different species of hardwood flooring can vary significantly. However, as always, you are going to get what you pay for. Reputable companies, selling quality, long lasting materials are going to charge more. Further, harder woods tend to take longer to grow, making them scarce and more expensive.
While the initial investment for some of the more durable hardwood floors can be significant, you have to balance this against the fact that these materials will tend to last much longer than other flooring options. Even the softest woods will outlast carpet and cork, while a solid, well maintained oak floor can last for generations.
At the low end of the price range you can purchase softwoods such as pine or cedar for even less than a dollar a square foot. Manufactured plywood sheets are going to be your least expensive option. While these may not be the richest or most high end materials, when well treated and maintained they can provide a space with a rustic beauty.