There are many ways to flirt. These are some of the best.

[edit] Steps

Be conscious of your appearance. Possibly the most important rule to remember when flirting with any guy! No, this does not mean you need to look like a stunning doll. Not every guy wants a Barbie girl. It means that you should be elegant and clean looking. You don’t need to be drop dead gorgeous. Be sure that you shower and clean yourself regularly. You should also wear deodorant, clean your ears, brush your teeth and hair, and you could try to paint your nails. Also, try to wear your hair in a style that makes you feel pretty and compliments your facial structure and use a perfume that smells sweet, but is not too overpowering. Being conscious of your appearance also means you have to have some level of fashion sense. You don’t need to have millions of expensive outfits to look cute because some simple fashions never go out of style. Try sporting dark, slimming jeans, a simple solid colored tank or cami, some chunky bead necklaces, or a cute sun dress. Or if you wear uniforms, just go with the outfit that hasn't been laying on the floor for a couple of days, and remember to accessorize!
Don’t go overboard or you’ll look like you tried way too hard. Also, don’t wear clothes that reveal too much, most guys like breasts but that will attract other male attention, aka almost all males, not necessarily men you want to be looking at your chest. this can be awkward and disgusting. Makeup is supposed to touch up your appearance, not hide it. Some eyeliner and lip gloss are all you need to play up your appearance and make you look fabulous. But don’t get too caught up in your appearance, there are plenty more things you need to know.
Achieve the Perfect Personality.
Whenever you talk to your special guy think of the three S’s: Sweetness, Sexiness and Smarts. Sweetness comes with vulnerability, shyness and kindness. These three factors are especially important because they are what make your hottie feel especially masculine. To act vulnerable and shy try tucking your hair behind your ears, smiling charmingly and batting your eyelashes, but make sure that you practice so it doesn't look like there is something in your eye. When ever you see him in the hall ways, be sure to give him a half smile and a real flirty look. Sexiness is confidence. Remember not to be too confident though. That may come off as self-absorbed and snobby. Smarts can fit into the sexiness category. Being smart is totally sexy. Sometimes, even just knowing the most random, irrelevant facts will be sexy.
Act Right
There are multiple ways to act flirty, here are some of the best suggestions:

Compliments-Be sure to compliment them in a casual and friendly way on things that are true. Sometimes people will make up compliments just to talk to someone, but that is the total wrong thing to do. You really should compliment on things you really like, so you sound more sincere naturally.Some times complimenting their family or other things they are proud of works.

Intense Eye-The intense eye is a trick that models spend years perfecting. You must give your hottie an intense stare that is both sexy and mysterious at the same time. BUT DON'T BE CREEPY. Also, try staring at the floor and slowly raising your eyes, looking directly at him. Once you have caught his attention, give him a sexy but subtle smile. You should try practicing the look in the mirror, and if completed correctly you should feel as sexy as a celeb.

Eyelash Batting- This trick is one of the oldest tricks known to woman. It gives you a sweet and vulnerable factor, which guys love because it make themselves feel powerful. Remember to practice this if you intend to use this technique.

Hair Flip and Twirl- If you want to catch a guys attention, flip your hair casually over your shoulder, twist it and then untwist it, tuck it behind your ears, or run your hands through it.

Soft Giggle and Smile-According to polls, a laugh and a smile are the sexiest things a female can wear. If you perfect your smile and laugh to be seductive and sweet, you will find some great results. Practice forcing a natural smile and laugh, it can help through awkward situations.

Magic Touch- You can learn to brush a guy in such a way that you send tingles up and down his spine. Casually tap him while laughing, rest your head on his shoulder if you’re tired and hold his hand when you're nervous; it will give him a sense of manliness and you a touch sweetie-pie, no pun intended. NOTE: A perfect, subtle way to touch him without just reaching up and grabbing his arm or something is to brush an imaginary fuzz off of his shoulder or something, or fix his sweatshirt string, or pick an imaginary hair off of his shirt. Totally subtle and initiates comfortable boundary-crossing in an innocent manner.
Approach him and start a conversation, but don't make it too obvious that you like him. If he approaches you, look him in the eyes as a sign of affection and confidence.
- Try to touch him whenever you can, on his arm or wherever else (make it appropriate, for now). Don't make it too obvious.
Just barely touch his left shoulder as you reach for something or whisper into his left ear. the left side is linked with the right brain,which is more in tune with emotions.
- Play with your hair or clothing.
- Once you've got his attention, look him in the eyes and smile. If he smiles back, slowly look down, and repeat. Guys like girls who can show off their smile.
- Don't make it too obvious when he's around his friends, unless you know that he likes you.
- Laugh with him, and help him to feel comfortable around you.
- Find a reason to whisper something in his ear.
- Don't try to be someone you aren't. You attract the kind of person you are. For example, don't pretend to be a jock when you're really a poet.
- Talk about what you have in common, and ask questions about what you don't. People love to feel like they're interesting. (And heck, they probably are, too.)
- End it by saying "I have to go but hopefully I'll see you around soon," or something else you feel comfortable with. The point is make it clear that you're leaving, but if he's interested, he's welcome to pursue you...if you're feeling bold, you can give him your number, or even get his.
If he's interested in you, don't just go immediately to "best friends" or "boyfriend." Just start hanging out with him, and become friends, slowly become best friends, until it becomes even more! You want to make sure it is the right guy for you, and you know what he likes in you!
If you are shy then you definitely don't want to rush things. Find any excuse you can to be close to him. If flirting isn't your thing, practice! Then you won't feel awkward when its your turn to step up to the plate!

[edit] Video

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[edit] Tips

ALWAYS have fun around him. Guys like to have fun and usually are more into girls that they can be themselves around!
Don't be shy! You've got to do something to give the message you like him
Wear clothes that you feel comfortable in. You should feel and look your best.
Say Mississippi once in your head before responding to anything he says. [This may help those who tend to interrupt people or talk a lot]
Think "flirt" when you talk. You will automatically start lowering your voice and sounding seductive.
Demand respect! If he talks perverted around you, don't laugh. He will think its okay and talk about that with you more often and begin to think of you just as a friend. If you demand respect, he will give it to you.
If you are sitting across the room from each other and you happen to look up and see him looking at you, don't turn away. Make eye contact and smile!
Likewise, if you are crushing on him and staring from across the room and HE happens to look up and catch you, don't be embarrassed, but don't smile and shyly look away. Then, try to make eye contact with him again, and THIS time, smile!(Hold this stare for at least 3 seconds.) But, if the first time he smiles at you, obviously you should smile back.
Practice everything in a mirror.
Try to be unique.
Make sure your guy is worth it, and not just a hot body.
Most importantly, have fun. This is your man, your experience and your life.
Don't flip your hair too much, instead find a small stray chunk and twist it around your fingers.
Don't boss him around, if he thinks you and he have any chance together, he doesn't want to be treated like a dog.
Try not to make it obvious that you are flirting.
Don't try too hard to impress him.
Be yourself, and add some flirting to go with it.
Auto-erotic touching (touch your lips, neck, chest with your fingers or hands) - it is something people do subconsciously when they like you, but you can manipulate it.
When he is around his friends, only flirt with him, not other guys. If he sees you flirting with someone else, he will think you are just a tease.
Whenever he's around, make sure you're having fun (laughing, etc.) so that he'll want to join in.
Take a break every now and then to leave him wanting more.
Massages are always nice.
Tell him you'd like to see him again if leaving, or mention that you'd like to try one of his hobbies.
Listen carefully to what he says, and let him know you were listening through your conversation by commenting on what he says.
Remember what he mentions in passing (it's the little things that count) and bring it up later as a question. For example, he says "I've got to go home, I'm helping my sister study for her exam tomorrow." Later, you ask, "How did your sister (call her by her name if you know it-it shows you can put two and two together) do on the exam?"
Do your research. If he mentions that he loves baseball, ask him if he watched the game on the weekend, and know the score or something that happened so you can talk about it. If you don't know much about what he likes (e.g. Baseball), get him to teach you something about it - he will feel knowledgeable and important, and it's the perfect excuse to spend time with him.
Don't ever lie to him. if you are sad and he picks up on it, let him know what is wrong; he'll become more open and you will feel more comfortable around him.
Ask to borrow things, or for help with something, but don't be too clingy. Show him that you can handle things for yourself most of the time. This way he will be intrigued by your independence.
Give him small things, like a stick of gum, or a pencil.
If you do hint about a movie, get more friends to go so it's less awkward.
See something scary so you can grab him at the scary parts of the movie. He'll feel manly and needed.
Find out what his favorite band is, then when you are around him, casually hum one of their songs. Instant convo!
If you think he's into you, flirt so it's kinda obvious you're crushed by a crush, otherwise,just tell him
Make sure you are constant with your actions, if you just stop interacting with him for a few days he could think you're not interested
If he notices how good you look, he will notice how good other girls look too. For example, you are hanging out at a carnival. You are flirting and he might flirt back, but if a hot girl walks by, he will probably look at her. He is not your boyfriend, so don't be jealous. Acting extra clingy will just turn him off.
Bite your bottom lip from time to time guys love it. (We really do!)
Sometimes we guys can be extremely dense. If you're getting the impression he's keeping your conversation at a friendship level try ONE very obvious flirt and gauge his response. It might take a second dose for him to shift paradigms and see you for the sweet thing you are but use it sparingly. When doing this you're making it more likely for him to risk returning your flirtations because you're shifting some of the rejection risk to yourself.
When you are talking on the phone, respect him and have mostly an equal limit of talking. you do not want one person talking and the other one just listening because it is most likely just the "yeahs" and the "mhms". Talk in short terms and be concise! This way both of you will be listening and he is sure to like you even more.
When you bite your lip, make sure you don't leave a dent. When you're at home, make sure you find ways to soften your lips for that special moment.
Try to make a joke when you're with him, but don't make it a stupid joke either. Guys always like a good laugh.
Try to bump into him in the hallways and say "Oops I'm sorry!" and then touch him lightly on the shoulder or his arm.
(A tip from a guy) Always say that you are happy when near him, but don't make him sound embarrassed in front of his friends, say it quietly then touch him.
(A tip from a guy) Not all men like to feel superior. If shyness doesn't work, give up that portion. Treat him on the SAME level as you. If he can't deal with that, then he's probably not a guy you should have. Also, most men don't like to feel inferior - remember that. You may be, but try not to shove it in his face
(A tip from a guy) Please -- and I can't stress this point enough -- don't be afraid to approach a guy, even if there's no apparent sign that he likes you. Most guys will be flattered if you're the one who makes the move; it's usually always up to us.
(A tip from a guy) We all like to be talked to, so don't wait for us to make the move. please...
(A tip from a girl): Some guys don't like it when a girl makes the first move...play a *little* hard to get..no one wants an easy girl.
If you're looking for someone who will genuinely care about and respect you, go for shy guys. Chances are they've had fewer -- or perhaps never had -- girlfriends, and therefore in most cases will have developed a deeper appreciation and respect for women.
Also, to really get his attention, say stuff like, "Sorry I have to go" or "Hey I have to go do something but I'll talk to you later". This way, the guy may think your cool because you're always busy. He may try to talk to you more if he's really interested in you. Don't try to always say "I have to go" the guy may just give up and stop talking to you (he may think you simply aren't interested). You should still have conversations to show him what you are like.
Don't just say "yeah", or any other short responses to every question he asks. He will feel like he is talking to a brick wall.
Another great tip is to softly throw something at him e.g. flowers, just make sure he isn't allergic!!
Compliment him! BUT, do not always expect a compliment back. This does not mean that he does not like you, so don't feel rejected. He is probably tripping over his own words from your compliment and isn't thinking about returning one.
Don't try to wear something that you are not comfortable in because not every guy wants his girl to be so hot - In the end you won't be together.
Don't always ask him silly questions every day. It makes him like you less.
Don't giggle a lot he will think you're weird.
Don't freak out if he likes another girl too; after flirting with him a little he will quickly like you back.

[edit] Warnings

Just be yourself no guy is worth changing yourself and you won't be able to continue your fake personality for too long, it just puts more stress on yourself.(Especially because people are attracted to those like them and you don't just want to end up with a hottie who has nothing in common with you...especially when they stop being so hot)
Don't flirt with someone's husband -- it only leads to trouble.
There’s a very fine line between sexy and slutty, if you push it too far you'll end up with a guy who likes you just for your body or...without a guy at all.
Never degrade yourself by acting unintelligent just for attention. Guys worth having want a girl who can have good, intelligent conversations.
Don't talk perverted about anyone. Even if he thinks it's funny, it's not a good thing to talk about his peers. It makes you seem like just another one of his guy friends and he will begin to not like you that way.
You can say no. It’s your body and any guy trying to do something that makes you feel uncomfortable is not worth it.
Don’t laugh too loud or create a commotion, it's a serious turnoff.
Some guys may or may not like clingy girls.
Some guys don’t like quiet, elegant girls; they would much rather a loud girl. All guys are different.
Don't let his attractive appearance distract or fool you.
Being a snob or a tease won't help you at all. It will just make him want to go away.
Don't wear too much perfume, makeup, or scented deodorant. It will send him running!
Be careful that he's not leading you on so he can make a fool out of you. If you fall in a trap like that, it's hard to recover.
Make sure he doesn't have a girlfriend who will be upset and resentful if you flirt with him.
Boys act differently around their friends (boy and girl). REALLY.
If his friends don't like you but he does, you shouldn't let him keep you a secret. This just shows that he isn't proud of his woman and you want someone who wants you for you and doesn't care about what others think. You don't have to rush to say that you're in love or not; so don't trap him.
Don't pretend to be interested in something just for the sake of flirting - if you decide to make a move, it might mean you end up pretending to be someone you're not.
Be careful about what you say you have done or are doing with other guys. Some find it to be a turnoff.
Don't flirt with guys you are not interested in. You may hurt them and yourself.
Don't flirt with your best friend's crush.
Don't try too hard, always look pretty and act flirty but be yourself and don't obsess with him. And you will kinda get this feeling when you know he likes you.
Make sure you definitely like him before you go flirting with him, you may get him hooked on you when it turns out you don't like him that way.
Some girls take one of their earphones out whilst they're listening to thier iPod to get close to them, but just make sure that if you do take it, don't pull their ear with it.
If he ends up going with someone else, don't get too jealous or bitchy, even if you are really annoyed. Don't flirt as much as before but remember, you can still have fun!!
If you've seen how he is with his other girlfriends and you don't like some of the things they did, don't feel pressured. Let him know your boundries before you start going out with him. Don't comprimise yourself for a guy. Set your standards.
Don't act to desperate