Flies or Flys – Which Is Correct?

When it comes to the word “fly”, do you say “flies” or “flys?” Which of these is correct? In this post, we will cover the answer to that question, as well as why that answer is what it is.

Flies or Flys – Which Is Correct?

The correct spelling of this word is “flies” in all contexts. This includes as a present or past tense verb for the word fly, or as the plural form of the insect. There is no situation in which “flys” is correct.

Flies or Flys

The word “flies” is always spelled as such. It doesn’t matter if you’re talking about a plane, time, or the insect, the correct spelling is always “flies”. It is never “flys”. There are many different definitions for the word, “fly”:

1. “To travel through the air”5. “A type of insect”
2. “To pass swiftly”6. “To control an aircraft”
3. “To be hurled through the air”7. “To move quickly”
4. “To run away”8. “To flutter in the wind”

But in all of these definitions, the fact remains: the present or past tense version of the word “fly” is “flies”. And in the cases where “fly” is a noun, the plural form of the word is “flies.” There is no modern situation in which “flys” is correct. For example:

  • Correct: They say that time flies when you’re having fun.
  • Incorrect: The jet flys through the air at supersonic speeds.

Despite the different definitions of “fly” in these sentences, “flies” is still the correct spelling of these other forms.


“Flies” is the correct spelling of the present and past tense forms of the verb “fly”. It is also the correct spelling of the plural form of the noun “fly”. It will always be the correct spelling no matter which definition you are using.

That can include the notion of time passing, things moving through the air, objects moving quickly, etc. The correct spelling is always “flies”.

  •  A baseball flies out of the stadium after getting hit by a legendary batter.
  • Roy is a pilot, which means he flies a plane for a living.
  • Grant noticed that it’s quite windy out today, so he flies a kite in order to relax.
  • I didn’t even notice how late it was; time flies when you are distracted.
  • The oncoming car flies by so quickly I don’t even have time to identify its model.

Many different definitions of “fly” are being used in these sentences. But even so, the correct spelling of their past and present forms is always “flies”.


“Flys” is a misspelling of “flies”. That’s it. It doesn’t have its own definition, and it’s not a special form of “fly”. No matter what definition of the word “fly” is being considered, you will never use “flys” for its past or present verb forms, or as a plural form of the noun “fly”.

Consider the example sentences below, and keep in mind that they are all incorrect:

  • Incorrect: I’m having a hard time keeping all these flys away from my food.
  • Incorrect: Charlie flys a helicopter in the military for a living.
  • Incorrect: The dodgeball flys to the other side of the gym after missing Jenny.
  • Incorrect: The raven flys away after being approached by a small child.
  • Incorrect: Time flys when you are not paying attention to the clock.

There is only one example of when it would be correct to use “flys”. In 19th century England, there was a wheeled vehicle that used muscle power to operate. It was called a fly, and the plural form of this noun was “flys”.

Of course, you would never use this word today, unless you were writing a book that took place in 19th century England that featured these vehicles.


The only thing you need to remember is that “flies” is correct and “flys” is wrong in all situations that matter. Short of writing historical fiction where a niche vehicle is brought up in plural form, there is no scenario in which “flys” is correct.

Regardless of definition, the past and present verb form of “fly” is “flies”, as is the plural form of the noun “fly”.