The two handsets have just been unveiled, and will be available to preorder on 15 September.
They'll begin shipping on 22 September.
Apple unveils the iPhone X
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The handsets are available with 32GB, 128GB or 256GB of internal storage, and start at $699 and $799.
iOS 11, meanwhile, will be available to download on 19 September.
Somewhat strangely, the iPhone 8 and 8 Plus aren't the headline launches of this year's Apple event.
That would be the iPhone X, a much more advanced version.
However, the iPhone 8 and iPhone 8 Plus are likely to be the model of choice for most consumers, as the iPhone X is much more expensive, and comes out later this year.
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