Luke 17:20 says the kingdom comes without observable signs—the lightning simile illustrates how it will be unmistakable yet not preceded by signs.

Luke 17:26 compares the Son of Man's day to Noah's days—both emphasize sudden judgment on an unprepared world, as lightning strikes.

Luke 17:30 explicitly says 'on the day when the Son of Man is revealed'—the same event described as lightning in verse 24.

Matthew 24:27 records the same teaching with nearly identical wording—lightning flashing from east to west pictures the Son of Man's coming.

2 Thessalonians 2:8 describes the Lord's coming appearance destroying the lawless one—the same event as the lightning-like unveiling of the Son of Man.

2 Peter 3:10 says the day of the Lord will come like a thief—the same suddenness as the lightning simile in this verse.

In Matthew 24:23, Jesus warns against false christs claiming secret locations—the lightning-like coming makes such claims impossible.

Mark 13:21 gives the same warning as Matthew 24:23—false claims of Christ's location are refuted by the universal visibility of His coming.

Zechariah 9:14 depicts the LORD's arrow going forth as lightning—the same sudden divine manifestation imagery used here for the Son of Man.

Job 37:3 describes lightning spanning the whole sky, a simile Luke uses for the sudden visibility of the Son of Man.