In Justice League,
Superman cools Steppenwolf's axe with his Arctic Breath which allows Wonder Woman to destroy it with her sword.
Is this the first use of Arctic Breath by a Kryptonian in the DCEU?
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There have only been two films that have featured Superman prior to Justice League. Neither of which feature either Superman or any other Kryptonian using the Arctic Breath power (if you're willing to accept the wiki as a source, it's covered here, otherwise I've seen both films and it does not occur).
As an aside, the last time it was used by Superman (on-screen) was in 2011, on the TV series Smallville. The episode aired in May 2011. It has, however, been used by a Kryptonian more recently; notably by Supergirl from the CW's Arrowverse.