Time Flies or Time Flys: Which Is Correct?

Time flies is correct. Flys is a spelling mistake, and here is the simple rule behind it.

The correct phrase is time flies. Flies is the third person singular form of the verb fly, and it is spelled with ies. The spelling time flys is wrong. The phrase means that time seems to pass very quickly, especially when you are busy or having fun.

At a Glance: Time Flies or Time Flys?

Form	Correct?	Why
Time flies	Yes	Singular subject takes the verb “flies”
Time flys	No	Verbs ending in a consonant plus y change to “ies”
Time fly’s	No	An apostrophe is not needed
Times flies	No	Use the singular “time”
Time flied	No	The past tense is “flew,” except for the baseball use “flied out”
Time flew	Yes	Past tense, as in “Time flew by during the trip”
Time has flown	Yes	Present perfect, using the past participle “flown”
Time is flying	Yes	Continuous form for something happening now

What Does Time Flies Mean?

Time flies is an idiom, pronounced /taɪm flaɪz/ in both American and British English. It means that time passes quickly, often more quickly than we expect. People say it when they notice that hours, days, or years have gone by fast.

For example:

• I cannot believe it is already December. Time flies.
• Time flies when you are having fun.
• How time flies! Your daughter is nearly as tall as you.
• We chatted for hours, and time flew by.

The phrase is neutral in tone. It can sound happy when you enjoy the moment, and it can sound a little sad when you notice how quickly life moves.

Why Is It Flies and Not Flys?

The answer comes from a basic spelling rule. When a verb ends in a consonant plus y, you change the y to ies to form the third person singular present tense. Time is a singular subject, so the verb needs this ending.

Here are other verbs that follow the same rule.

• fly becomes flies
• try becomes tries
• cry becomes cries
• carry becomes carries
• study becomes studies

So you write he flies, she tries, and time flies. Writing flys breaks the rule, and no standard dictionary lists it as a correct form of the verb.

One more point helps. The word flies is also the plural of the noun fly, as in two flies buzzing in the room. So the spelling flies already serves two jobs, and there is no reason to invent a third form with a y.

Other Forms of the Verb Fly

The verb fly is irregular, so its forms are worth knowing.

• Present: fly, flies
• Past: flew
• Past participle: flown
• Continuous: flying

Here is how they look with the phrase.

• Time flies. (present)
• Time flew by during the holidays. (past)
• Time has flown since we moved here. (present perfect)
• Time is flying. (continuous)

Notice that the past tense is flew, not flied. The form flied exists in one special use. In baseball, a batter who hits a fly ball that is caught is said to have flied out. Outside that use, flew and flown are the correct forms.

Where the Phrase Comes From

The idea is very old. The Latin phrase tempus fugit, which means time flees or time flies, is widely traced to a line in the Roman poet Virgil’s Georgics. English speakers have used the same picture for a long time, comparing time to something that moves fast and cannot be caught. The Latin phrase still appears on clocks and sundials, which is a fitting place for it.

In English, the full saying is often extended to time flies when you are having fun, which adds a happy twist to the older, more serious thought.

Similar Ways to Say It

If you want a different expression, these options carry a similar meaning.

• Time passes quickly.
• The days are slipping away.
• The hours fly by.
• Time races on.
• Where has the time gone?
• The years go by so fast.

Use time flies when you want a short, familiar phrase. Use the longer options when you want a more descriptive or poetic tone.

Example Sentences

• The weekend is over already. Time flies!
• Time flies when you are reading a good book.
• It seems like yesterday that we graduated. How time flies.
• We worked all afternoon, and time flew.
• Time has flown, and the festival is only a week away.

Common Mistakes

• Writing time flys. The correct spelling is flies.
• Writing time fly’s. An apostrophe is not needed.
• Writing times flies. Use the singular time with flies.
• Writing time flied. The past tense is flew.
• Writing time is fly. Use flies or is flying.

Quick Memory Tip

If a verb ends in a consonant plus y, think of the word flies, tries, and cries. Say them together, and flys will look wrong. You can also tell yourself that time is one subject, so it needs flies.

Frequently Asked Questions

Is it time flies or time flys? Time flies is correct. Flys is a misspelling.

What does time flies mean? It means that time seems to pass quickly.

Is time flies an idiom? Yes. It is a common idiom that uses fly in a figurative way.

What is the past tense of time flies? Time flew, as in time flew by during the trip.

Where does time flies come from? It is linked to the Latin phrase tempus fugit, which is traced to Virgil.

Is it time flies or time fly?
Use “flies” because “time” is a singular subject. Use “fly” after a helping verb, as in “Time will fly” or “Let time fly.”

What does “time flies when you’re having fun” mean?
It means time seems to pass quickly when you are enjoying yourself.

What does “how time flies” mean?
It is an exclamation that shows surprise at how fast time has passed, as in “How time flies! The kids are grown up.”

Is “time flies by” correct?
Yes. The word “by” is optional and stresses that time is passing, as in “Time flies by when we are busy.”

What is the opposite of time flies?
“Time drags” is the closest opposite. It means time seems to pass very slowly, usually when you are bored or waiting.

Is time flies formal or informal?
It is neutral and common in everyday speech and writing. In formal or academic writing, “time passes quickly” is a safer choice.

How do you say time flies in Latin?
The Latin phrase is “tempus fugit.”

Can I say time flew?
Yes. “Flew” is the past tense, as in “Time flew during the holidays.”

Conclusion

Time flies is the correct spelling, and it follows the standard rule of changing y to ies. The form flys is not accepted in standard English.

Use time flew for the past, time has flown for the present perfect, and time is flying for something happening now. These forms keep your writing clear and correct.

The next time you notice how fast the days are going, you will know exactly how to write it.

Read More: Questionnaire or Questionaire: Spell It Right