If you are wondering whether “flys” or “flies” is correct, the answer depends on what you mean. In standard English, flies is the correct spelling when you are talking about more than one flying insect or using the verb fly with he, she, or it. For example, “There are several flies in the room” and “She flies to London every summer” are both correct. Flys is generally not a standard English word, although it can occasionally appear as a name, abbreviation, or informal/nonstandard spelling.
The confusion happens because many English words form their plurals by simply adding -s, while words ending in -y often change the y to -ies. Understanding this small spelling rule makes the difference between flys and flies much easier to remember. In this guide, you will learn when to use flies, why flys is usually incorrect, and how to use the correct form in everyday sentences.
Quick Answer
Flies is the standard correct spelling in English. It can be the plural of fly, meaning more than one flying insect, or the third-person singular form of the verb fly. Flys is generally incorrect in standard English. Say “two flies” and “he flies,” not “two flys” or “he flys.”
Why Do People Confuse Flys and Flies?
People often confuse these words because fly ends in -y, and English uses different spelling rules for words ending in y.
When a noun ends in a consonant + y, its plural usually changes y to ies:
- fly → flies
- baby → babies
- city → cities
- story → stories
The same spelling can also appear when fly is used as a verb:
- I fly.
- You fly.
- He flies.
- She flies.
So, flies has two common uses: it can be a plural noun or a verb form.
First Word: Flys
Flys is generally not a standard English spelling.
If you want to talk about more than one insect called a fly, use flies.
Incorrect:
- There are three flys in the kitchen.
- I saw two flys near the window.
Correct:
- There are three flies in the kitchen.
- I saw two flies near the window.
Likewise, when fly is a verb and the subject is he, she, or it, the correct form is flies:
- He flies every month.
- The bird flies over the lake.
- The plane flies at a high altitude.
Can “Flys” Ever Appear?
You may sometimes see flys as part of a name, brand, username, abbreviation, or other special usage. Such cases do not make flys the standard plural or verb form of fly.
For ordinary English writing, use flies.
Second Word: Flies
Flies is the standard English form of fly in two important situations.
1. “Flies” as a plural noun
When you mean more than one insect called a fly, use flies.
- One fly
- Two flies
- Many flies
Example:
There are several flies around the food.
2. “Flies” as a verb
Flies is also the third-person singular present form of the verb fly.
Use it with he, she, it, or a singular noun.
- He flies to New York.
- She flies home tomorrow.
- The eagle flies above the mountains.
- The plane flies over the city.
Flys vs. Flies Comparison Table
| Word | Standard English? | Main Use | Example |
| flys | Generally no | Usually a misspelling or special name/usage | “Flys” is usually incorrect. |
| flies | Yes | Plural noun | There are five flies in the room. |
| flies | Yes | Third-person singular verb | She flies to Paris tomorrow. |
| fly | Yes | Singular noun or base verb | I saw a fly. / Birds fly. |
When Should You Use Each?
Use “flies” for more than one insect
Use flies when you are talking about two or more insects.
- One fly
- Two flies
- Ten flies
Example:
The flies were attracted to the food.
Use “flies” with he, she, or it
Use flies when the verb fly has a singular third-person subject.
- He flies.
- She flies.
- It flies.
- The bird flies.
- The plane flies.
Example:
My brother flies to Dubai for work.
Do not normally use “flys”
In standard English, flys should not be used as the plural of fly or as the third-person singular form of the verb fly.
10+ Examples of Flies in Sentences
- There are several flies in the kitchen.
- I saw two flies near the window.
- The flies were bothering the dog.
- She flies to Canada every year.
- He flies home on Friday.
- The bird flies across the sky.
- The plane flies over the mountains.
- A group of flies landed on the table.
- My father flies for work quite often.
- The eagle flies high above the valley.
- These flies are attracted to food.
- The pilot flies the aircraft safely.
Notice that the spelling flies stays the same in both noun and verb uses.
Common Mistakes
Mistake 1: Using “flys” as the plural
Incorrect:
I saw three flys.
Correct:
I saw three flies.
Mistake 2: Writing “he flys”
Incorrect:
He flys to London every month.
Correct:
He flies to London every month.
Mistake 3: Assuming every word ending in “y” takes “-s”
English spelling rules are not always as simple as adding -s.
For a consonant + y, the y commonly changes to ies:
- fly → flies
- baby → babies
- city → cities
- party → parties
Mistake 4: Confusing “flies” with “fly”
Remember that fly can be both a singular noun and a base-form verb.
- I saw a fly.
- The birds fly south.
- I saw several flies.
- The bird flies south.
Memory Trick
Think of this simple rule:
Consonant + Y → change Y to IES
So:
fly → flies
You can remember it with the sentence:
One fly, two flies.
And for the verb:
I fly, but she flies.
If you remember those two examples, you will usually know when to write flies.
American vs. British English
There is no standard American-versus-British spelling difference between flies and flys. In both American English and British English, flies is the standard spelling for the plural noun and the third-person singular form of the verb fly.
For example, both varieties use:
- The flies are outside.
- She flies to London tomorrow.
Some vocabulary and pronunciation can differ between American and British English, but this particular spelling remains flies in standard usage.
Similar Words
The spelling pattern in flies is similar to several other English words.
| Singular | Plural |
| fly | flies |
| baby | babies |
| city | cities |
| story | stories |
| country | countries |
| family | families |
These examples can help you recognize the common consonant + y → ies spelling pattern.
However, not every word ending in y follows this pattern. When a word ends in a vowel + y, the plural often simply adds -s:
- boy → boys
- toy → toys
- day → days
- key → keys
That is why it is useful to look at the letter immediately before y.
Final Verdict
Flies is the correct standard English spelling when you mean the plural of fly or the third-person singular form of the verb fly.
- One fly → two flies
- I fly → she flies
Flys is generally not correct in ordinary standard English. If you are writing an essay, email, school assignment, article, or formal document, choose flies.
FAQs:
Is “flys” a correct word?
Flys is generally not a standard English spelling. In normal writing, use flies instead.
Is it “two flys” or “two flies”?
The correct form is “two flies.” The plural of fly changes y to ies.
Is it “he flys” or “he flies”?
The correct form is “he flies.” Flies is the third-person singular present form of the verb fly.
Why does fly become flies?
Because fly ends in a consonant followed by y. When forming its plural, the y changes to ies: fly → flies.
What is the plural of fly?
The plural of the noun fly is flies.
Example:
One fly was on the wall, but three flies were on the window.
What is the past tense of fly?
The simple past tense of fly is usually flew.
Example:
The bird flew over the house.
The past participle is flown:
The bird has flown away.
Is “flies” a noun or a verb?
Flies can be either a noun or a verb. As a noun, it means more than one fly. As a verb, it is the third-person singular form of fly.
Remember This
Fly → flies when you need the plural noun.
I fly → she flies when you need the third-person singular verb.
Flys is generally incorrect in standard English.
Conclusion
The difference between flys and flies is simple once you remember the spelling rule. Flies is the standard form for the plural of fly and for the third-person singular present form of the verb fly. if you are talking about insects or describing someone traveling through the air, flies is the form you normally need.
If you are unsure, remember two short examples: “two flies” and “she flies.” Both show the correct spelling. Avoid flys in standard English writing unless it is being used as a special name or other proper form.
