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Options on the E-mini S&P 500 Futures at the CME: what's the expiry date of the underlying future?
I don't see EWQ6 in any of your links, so I can't say for certain, but when you buy an option contract on a future, the option will be for a specific future (and strike).  So the page you're looking at may be for options on E-mini S&P 500 futures in general, and when you actually purchase one through your broker, you pick a specific expiry (which will be based on the "prompt" future, meaning the next future that expires after the option) and strike. UPDATE: Based on this page mirror, the option EWQ7 is an option on the ESU7 (SEP 2017) future.  The next 3 monthly options use ESZ7 as the underlier, which confirms that they use the next prompt future as the underlier.