The F-15S is a variant of the F-15E supplied to the Royal Saudi Air Force (RSAF) in the 1990s. Saudi Arabia previously sought to buy up to 24 F-15Fs, a proposed single-seat variant, but was blocked by the U.S. Congress. The F-15S, initially referred to as F-15XP, is almost identical to the USAF F-15E, the only major difference in the AN/APG-70 radar's performance in synthetic aperture mode. 72 were built from 1996 to 1998. In October 2007, GE announced a US$300 million contract with Saudi Arabia for 65 GE F110-GE-129C engines for the F-15S. The F-15S fleet is being upgraded to a broadly comparable configuration as the later F-15SA (Saudi Advanced) and designated F-15SR with 66 aircraft planned to be upgraded by 2026.

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