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"Time flies so fast" vs "Time runs so fast"

Both phrases are correct and commonly used to express the idea that time passes quickly. 'Time flies so fast' is a more idiomatic expression, while 'time runs so fast' is also acceptable but less common.

Last Updated: March 24, 2024

Time flies so fast

This is correct

This is a common idiom used in English to indicate that time seems to pass more quickly in certain situations.

ExpertExplanation provided by a TextRanch English expert

Preferred Form:
Time flies so quickly


Some examples from our editors:

  • Time flies so fast when you're having fun!
  • It's been so long since I've seen you -- I can't believe how fast the time flies!
  • My baby is already starting school; time flies so fast!

Some alternatives from our editors:

  • Time flies quickly.
  • The time has flown.
  • Time really flies.
  • The years have passed quickly.

Time runs so fast

This phrase is also correct, but it is less common than 'time flies so fast' to convey the idea of time passing quickly.

This phrase can be used to describe the rapid passage of time, but it is not as idiomatic as 'time flies so fast.'

Examples:

  • I feel like time runs so fast when I'm with you.
  • Time runs so fast when you're enjoying yourself.
  • It seems like time runs so fast during the summer.

Alternatives:

  • time passes quickly
  • time goes by so fast
  • time slips away so quickly
  • time zooms by
  • time rushes by

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