Time Has Flown By or Time Has Flew By: What Is Correct?

Have you ever looked back on a busy week, a vacation, or a year and wondered where the time went? You might want to say, “Time has flown by,” but the similar-sounding phrase “time has flew by” can cause confusion. Both expressions refer to time passing quickly, yet only one follows standard English grammar. The difference comes down to the irregular verb fly and its past-tense forms. Once you understand when to use flew and flown, you can choose the right expression in everyday conversations, school assignments, emails, and professional writing.

Direct answer: “Time has flown by” is the correct expression in standard English. “Time has flew by” is grammatically incorrect because flew is the simple past form of fly, while flown is the past participle used after has. You can also correctly say “Time flew by” when using the simple past tense.

Key Takeaways

• Time has flown by is correct; time has flew by is incorrect in standard English.
• The three main forms of fly are fly → flew → flown.
• Use flew for the simple past: “Time flew by during our trip.”
• Use flown after has, have, or had: “Time has flown by.”
• Both correct expressions describe time that seems to pass quickly.
• Choose the tense that fits your sentence, not just the one that sounds familiar.

What Is the Difference Between “Time Has Flown By” and “Time Has Flew By”?

The main difference is grammatical, not semantic. Both phrases aim to express the idea that time passed quickly, but only “time has flown by” uses the correct verb form after has.

The verb fly is irregular, so its forms do not follow the regular pattern of adding -ed. Cambridge Dictionary lists flew as the simple past form and flown as the past participle.

The simplest rule is to check the helping verb. When the sentence uses has, have, or had in a perfect-tense construction, the verb fly becomes flown, not flew.

Why Is “Time Has Flown By” Correct?

“Time has flown by” is correct because it uses the present perfect tense. This tense combines has with the past participle flown to describe a past experience or change that remains relevant to the present.

Here is how the expression works:

• Time: The subject of the sentence.
• Has: The auxiliary, or helping, verb.
• Flown: The past participle of fly.
• By: Part of the expression fly by, meaning to seem to pass quickly.

For example:

Time has flown by since I started my new job.

The sentence looks back at when the job began and emphasizes how quickly the period seems to have passed up to now.

You can use the same construction with other subjects:

• The weekend has flown by.
• The school year has flown by.
• The past few months have flown by.
• Our time together has flown by.

Notice that the helping verb changes to match the subject. Use has flown with a singular subject such as the weekend, and have flown with a plural subject such as the months.

Why Is “Time Has Flew By” Incorrect?

“Time has flew by” is incorrect in standard English because flew is the simple past form, not the past participle required in this construction.

Think of has as a signal to check the verb form that follows it. In the present perfect tense, the usual structure is:

Subject + has/have + past participle

Examples of correct combinations include:

• She has gone home.
• He has written a letter.
• The children have eaten lunch.
• Time has flown by.

The same pattern explains why these combinations are incorrect in standard English:

• She has went home.
• He has wrote a letter.
• The children have ate lunch.
• Time has flew by.

The problem is not the meaning of flew. It is the verb form used after has. In the simple past, flew is perfectly correct: “Time flew by during the meeting.”

How Do You Use “Flew” and “Flown” Correctly?

Choose flew or flown based on the tense and structure of the sentence. Both are forms of the verb fly, but they serve different grammatical roles.

1. Use “flew” for the simple past tense

Use flew when describing an event or period in the past without a perfect-tense helping verb.

Examples:

• Time flew by during our road trip.
• The afternoon flew by while we talked.
• My first year of college flew by.
• The meeting flew by because the discussion was interesting.

In these sentences, flew describes a past experience. You do not need has or have before it.

2. Use “flown” after “has,” “have,” or “had”

Use flown as the past participle in perfect-tense constructions.

Examples:

• Time has flown by since we met.
• The last three months have flown by.
• The school year had flown by before we realized it.
• Our vacation has flown by so quickly.

The helping verb determines the construction. Has flown and have flown commonly connect past time to the present. Had flown places the experience before another past event.

3. Remember the three forms of “fly”

Fly

Base form

Time can fly when you are having fun.

Flew

Simple past

Time flew by during the holiday.

Flown

Past participle

Time has flown by this year.

If you remember only one thing, remember this sequence: fly → flew → flown.

“Time Flew By” vs. “Time Has Flown By”: When Should You Use Each?

Both expressions are grammatically correct. The difference is the way each sentence presents the time that passed.

The present perfect does not always mean that the event is still happening. Instead, it connects an earlier period or experience to the present. The simple past generally presents the event as a completed occurrence in the past.

Practical example: Talking about a vacation

Imagine you have just returned from a two-week trip. You could write:

“Time flew by during our vacation.”

This describes a finished experience. If you are reflecting on a longer period that reaches the present, you might write:

“Time has flown by since we started traveling together.”

Neither sentence is inherently better. Choose the one that matches the time relationship you want to express.

Practical example: Writing about work

Suppose you are celebrating your first anniversary at a company. You might say:

“Time has flown by since I joined the company.”

This sounds natural because you are reflecting on the period from your start date until now.

If you are telling a story about a completed project, you might instead say:

“Time flew by while we worked on the launch.”

The tense changes because the context changes, not because one expression is more formal than the other.

What Common Mistakes Should You Avoid?

The most common mistake is using flew after has or have. Other errors happen when writers choose the correct verb form but use the wrong tense for the time they are describing.

One important nuance: “Time has flown by yesterday” is not the best standard construction because yesterday identifies a completed past period. “Time flew by yesterday” is the natural choice.

Why do people mix up “flew” and “flown”?

The two words are easy to confuse because they belong to the same irregular verb and both refer to the past in some way. Learners may also expect flew to work after has because many verbs have identical simple-past and past-participle forms, such as walked.

However, irregular verbs do not all follow the same pattern. Learning the three forms together helps prevent the error.

How Can You Choose the Correct Expression? A Quick Checklist

Use this checklist whenever you are unsure whether to write time has flown by or time has flew by.

Grammar check

0 of 5 complete

Find the helping verb: has, have, or had.

Check whether you need a perfect-tense construction.

If you use has, have, or had, write flown.

If you are using simple past without a helping verb, write flew.

Read the full sentence to confirm that the tense matches the time context.

Reset checklist

Quick test: Which sentence is correct?

• A. Time has flew by since we met.
• B. Time has flown by since we met.

The correct answer is B because flown is the past participle of fly.

What Tools and Resources Can Help You Check Verb Forms?

A reliable dictionary can confirm irregular verb forms, pronunciation, and usage examples. For this question, Cambridge Dictionary is a useful starting point because its entry for fly lists flew as the past tense and flown as the past participle. It also provides examples of fly by used for time passing quickly.

When checking a grammar question:

1. Look up the base verb. Search for fly, not only the phrase in question.
2. Check its principal forms. Confirm the base form, simple past, and past participle.
3. Review the example sentences. See how the word works with has, have, or had.
4. Read your sentence aloud. This can help you notice an awkward phrase, although sound alone cannot confirm grammatical correctness.
5. Use a grammar checker as a second opinion. Automated tools can help identify errors, but verify any correction that changes the tense or meaning.

A dictionary confirms the forms; understanding the sentence structure helps you apply them correctly.

Frequently Asked Questions

1. Is “time has flew by” grammatically correct?

No. “Time has flew by” is not correct in standard English because flew is the simple past form of fly. After has in the present perfect tense, use the past participle flown. Write “time has flown by” instead.

2. Is “time has flown by” correct?

Yes. “Time has flown by” is grammatically correct and natural in everyday English. It uses the present perfect tense to reflect on a period that seems to have passed quickly. For example, “Time has flown by since we graduated” connects the past event of graduation to the present.

3. What is the difference between “flew” and “flown”?

Flew is the simple past tense of fly, while flown is its past participle. Use flew in “Time flew by during the show.” Use flown in “Time has flown by during the past year.” The basic pattern is fly → flew → flown.

4. Should I say “time flew by” or “time has flown by”?

Both are correct, but they fit different contexts. Use “time flew by” to describe a completed past experience. Use “time has flown by” when reflecting on a period that remains connected to the present. For example, “Time flew by on our trip” and “Time has flown by since we met” are both correct.

5. Can I use “time has flown by” in formal writing?

Yes. “Time has flown by” is appropriate in standard written English, including personal reflections, professional messages, and informal reports. It is an idiomatic expression rather than slang. In a highly technical or formal report, a more direct phrase such as “the period passed quickly” may suit the context better.

6. Is “the years have flown by” correct?

Yes. “The years have flown by” is correct because years is plural and takes have, followed by the past participle flown. The expression means that the years seem to have passed quickly. For a singular subject, write “The year has flown by.”

7. What is the past participle of “fly”?

The past participle of fly is flown. Its three principal forms are fly (base form), flew (simple past), and flown (past participle). Examples include “Birds fly,” “The bird flew away,” and “The bird has flown away.”

8. What are some alternatives to “time has flown by”?

You can say “time has passed so quickly,” “the months have gone by fast,” “I can’t believe how quickly the time passed,” or “where has the time gone?” Choose an alternative that fits your tone. “Time has flown by” is conversational and expressive, while “the period passed quickly” sounds more neutral.

Conclusion: Choose “Time Has Flown By”

When deciding between “time has flown by” and “time has flew by,” choose “time has flown by.” The difference comes from the irregular verb fly: flew is the simple past form, and flown is the past participle.

Use “time flew by” for a completed past event, such as a vacation or meeting. Use “time has flown by” when connecting a past period to the present. To remember the distinction, keep the three forms together: fly → flew → flown.

Before publishing or sending a sentence, check the helping verb and the time context. That quick habit will help you choose the correct form with confidence.