$39 Find Cheap Flights to New York State

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from the United States to New York departing on 11/16. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to New York State

 
These are the airlines KAYAK users have selected most often from within our search results for flights to New York State
These are the airlines KAYAK users have selected most often from within our search results for flights to New York State
Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights to New York

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
New York
New Yorknonstop$72
Buffalo
Buffalononstop$57
Syracuse
Syracusenonstop$87
Albany
Albany1 stop$154
Rochester
Rochesternonstop$107
Ithaca
Ithacanonstop$199
Elmira
Elmira1 stop$266
Niagara Falls
Niagara Falls2 stops$350
Plattsburgh
Plattsburghnonstop$166
Binghamton
Binghamton1 stop$282
Watertown
Watertown1 stop$214
Ogdensburg
Ogdensburg2 stops$1,185
Saranac Lake
Saranac Lakenonstop$183
Islip
Islipnonstop$57
New York
New Yorknonstop$72
Buffalo
Buffalononstop$57
Syracuse
Syracusenonstop$87
Albany
Albany1 stop$154
Rochester
Rochesternonstop$107
Ithaca
Ithacanonstop$199
Elmira
Elmira1 stop$266
Niagara Falls
Niagara Falls2 stops$350
Plattsburgh
Plattsburghnonstop$166
Binghamton
Binghamton1 stop$282
Watertown
Watertown1 stop$214
Ogdensburg
Ogdensburg2 stops$1,185
Saranac Lake
Saranac Lakenonstop$183
Islip
Islipnonstop$57

Book Cheap New York Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights to New York that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals to New York

Wed, Nov 19 - Sat, Nov 22
Frontier Logo
10:14 pm - 12:33 amATL-JFK
2h 19mnonstop
Frontier Logo
10:00 am - 12:38 pmJFK-ATL
2h 38mnonstop
$72Frontier
Find Deal
Wed, Dec 24 - Wed, Dec 31
Frontier Logo
10:35 pm - 12:55 amATL-JFK
2h 20mnonstop
Frontier Logo
6:20 am - 9:08 amJFK-ATL
2h 48mnonstop
$73Frontier
Find Deal
Wed, Dec 10 - Wed, Dec 10
JetBlue Logo
11:58 am - 2:12 pmATL-JFK
2h 14mnonstop
JetBlue Logo
4:35 pm - 7:12 pmJFK-ATL
2h 37mnonstop
$120JetBlue
Find Deal
Sat, Dec 6 - Sat, Dec 6
JetBlue Logo
11:25 am - 4:57 pmORD-JFK
4h 32m1 stop
JetBlue Logo
8:00 pm - 9:52 pmJFK-ORD
2h 52mnonstop
$130JetBlue
Find Deal
Thu, Jan 15 - Sun, Jan 25
United Airlines Logo
6:47 pm - 9:48 pmFLL-EWR
3h 01mnonstop
United Airlines Logo
9:40 pm - 12:54 amEWR-FLL
3h 14mnonstop
$137United Airlines
Find Deal
Wed, Dec 3 - Sat, Dec 6
United Airlines Logo
7:00 am - 11:23 amDFW-EWR
3h 23mnonstop
United Airlines Logo
6:55 pm - 10:03 pmEWR-DFW
4h 08mnonstop
$179United Airlines
Find Deal
Thu, Jan 15 - Sun, Jan 18
American Airlines Logo
10:35 am - 5:59 pmHOU-LGA
6h 24m1 stop
American Airlines Logo
6:30 am - 12:09 pmLGA-HOU
6h 39m1 stop
$209American Airlines
Find Deal
Thu, Nov 27 - Thu, Dec 4
Delta Logo
2:15 pm - 10:34 pmLAX-JFK
5h 19mnonstop
Delta Logo
9:45 pm - 1:10 amJFK-LAX
6h 25mnonstop
$222Delta
Find Deal
Thu, Nov 27 - Thu, Dec 4
Delta Logo
10:59 pm - 7:30 amSFO-JFK
5h 31mnonstop
Delta Logo
9:00 am - 12:36 pmJFK-SFO
6h 36mnonstop
$253Delta
Find Deal
Fri, Jan 16 - Mon, Jan 19
American Airlines Logo
9:04 am - 4:07 pmHOU-LGA
6h 03m1 stop
American Airlines Logo
10:35 am - 6:06 pmLGA-HOU
8h 31m1 stop
$253American Airlines
Find Deal
Booking Insights

KAYAK's insights & trends for flights to New York

Get data-powered insights and trends for flights to New York to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest flight to New York State?

These are the best round-trip prices found by users searching on KAYAK in the last 72 hours.

The cheapest ticket to New York State from the United States found in the last 72 hours was to Newark Airport, at $49 round-trip. The most popular route is Atlanta (ATL) to Newark Airport (EWR) and the cheapest round-trip airline ticket found on this route in the last 72 hours was $49.

How much is a flight to New York State?

The average and cheapest price for all round-trip flights to New York State from each origin found by users searching on KAYAK in the last month.

A flight to New York State costs $302 on average. The cheapest price found on KAYAK in the last 2 weeks was $29 for the route Atlanta (ATL) to Albany (ALB). The most popular routes on KAYAK are Orlando to Albany which costs $216 on average, and Raleigh to Albany, which costs $283 on average.

See prices from:

What is the cheapest month to fly from the United States to New York State?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from the United States to New York State, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from the United States to New York State is March, when tickets cost $316 (return) on average. On the other hand, the most expensive months are February and June, when the average cost of round-trip tickets is $461 and $443 respectively.

Which is the cheapest airport to fly into in New York State?

Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in New York State is Massena Richards Field Airport (MSS), with an average flight price of $60.

Good to know

Low seasonFebruary
Cheapest flight$39
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly with an average 15% increase in price.
Flight from Atlanta to New York John F Kennedy Airport

Flights to New York: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew to New York 
MathewFlew with DeltaSAN-JFKJun 2025
Make sure to pack 2-3 days of clothing in a carryon.
Kent ThienFlew with Korean AirSAV-JFKFeb 2025
Try to check in online to avoid the lines
Verified travelerFlew with Breeze AirwaysMYR-HPNDec 2024
Take a screenshot of your reservation, so you have evidence of what you booked.
Verified travelerFlew with Hawaiian AirlinesHNL-JFKOct 2024
Bring a snack with you in the event you are not happy with dinner.
mauriceFlew with IberiaORD-JFKSep 2024
You should arrive early, take a lighht snack and be prepared for delays.
RolandoFlew with British AirwaysAUS-JFKJun 2024
Pay for the upgrade to be bumped up in an earlier group. Makes finding a spot for your carryon bag much easier. Also, please make sure any purse is packed into your personal bag. When they say a carryon and 1 personal item they mean it. Save yourself stress and holding others up by sticking to it.
HenryFlew with Breeze AirwaysMCO-SWFAug 2024
For MCO arrive with plenty of time to make it through the TSA checkpoint. Stewart / Newburgh is a great smaller airport to fly in or out of.
ChrisFlew with FrontierMYR-ISPJul 2024
Ship your larger items and clothing. Bring a backpack only on plane
Verified travelerFlew with British AirwaysMIA-JFKJun 2024
New York JFK is massive and the signage there for connecting flights is not so good as you need to travel via AirTrain between the different terminals and the signage for this is missing in some places, making it confusing as to which way to go.
AlexanderFlew with Spirit AirlinesORD-LGAMay 2024
Know your connection options — specially when LaGuardia Airport (LGA) only has buses going to/from the airport to the rest of the city. Luckily, the one to the subway station (Q70) is free-of-charge to ride on!
LuisFlew with American AirlinesPHX-JFKMay 2024
Google the airplane they will fly in to see if it will be comfortable or not. I recommend the 777-200ER
JayFlew with Alaska AirlinesSEA-JFKMay 2024
Bring entertainment since there are no screens available to watch movies or check on current map of destination.
NettyFlew with DeltaSYR-JFKApr 2024
you may have to valet check your bag. overhead space is very small
andrewFlew with DeltaATL-LGAJan 2024
new terminal C at LGA is the way to go for delta vs JFK or newark. getting a n uber or lyft was easy
AdeleFlew with JetBlueFLL-JFKDec 2023
Avoid arriving at JFK Terminal 5 if you plan on using ride sharing. Long slog to pickup area due to construction till mid-2025

FAQs - booking New York State flights

  • Which airport do I fly into to visit Niagara Falls?

    The airport closest to Niagara Falls is the Buffalo Niagara International Airport. The airport is about 35 min by car from the famous natural site, and it’s served by direct regular flights from many cities in the United States, including Dallas, Chicago, Boston, Minneapolis, and Los Angeles.

  • Which airport is best to visit Ithaca?

    Ithaca is served by Ithaca Tompkins Regional Airport (ITH), located less than 6 mi from Ithaca’s city center. When looking for flights to New York to visit this city, keep in mind that you’ll have limited options when it comes to routes and airlines. The airport is served by nonstop flights from Charlotte and Philadelphia operated by American Eagle, from Detroit via Delta Connection, and from Washington via United Express. If you’re looking for more flight options, you can also fly into the Syracuse airport, about 1h 20m from Ithaca by car.

  • I’m visiting the Hudson Valley. Which airport in New York do I fly into?

    Hudson Valley is served by the Stewart International Airport (SWF), less than 1h away by car. Regular nonstop flights to New York are operated by Allegiant Air from Orlando and St. Petersburg, Fla.; by American Eagle from Philadelphia; by Delta Connection from Detroit; and by JetBlue from Fort Lauderdale and Orlando.

  • I’m visiting White Plains. What’s the best airport to fly into?

    If you're flying nonstop from Charlotte, Chicago, Washington, Atlanta, Detroit, Fort Lauderdale, or Orlando, it's best to fly into Westchester County Airport (HPN). Not only is this airport less busy, but it's also less than 10 mi from downtown White Plains. If you’re flying from elsewhere in the US, it’s best if you look for nonstop flights to New York that land at LaGuardia, which is about 1h away by car.

  • How does KAYAK find such low prices on flights from the United States to New York State?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from the United States to New York State.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from the United States to New York State?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from the United States to New York State is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from the United States to New York State?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from the United States to New York State with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from the United States to New York State?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from the United States to New York State up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest day to fly to New York State?

    Based on KAYAK data, the cheapest day to fly to New York State is Friday where round-trip tickets can be as cheap as $370. On the other hand, the most expensive day to fly is Sunday, where round-trip prices are $522 on average.

  • What is the cheapest time of day to fly to New York State?

    The cheapest time of day to fly to New York State is generally in the evening, when round-trip flights cost $366 on average. Morning departures are around 23% more expensive than evening flights, on average. The most expensive time of day to fly to New York State is generally in the morning, which is peak travel time and where the average cost of a ticket is $449.

Top tips for finding cheap flights to New York State

  • Looking for cheap airfare to New York State? 25% of our users found round-trip tickets to New York State for the following prices or less: From Boston $369, from Atlanta $393, from Cleveland $549
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest New York State flight deals.
  • Although the Big Apple only has two airports in the state of New York, travelers looking for flights to New York City have three options to choose from. Those three airports are LaGuardia Airport (LGA) in northern Queens, Newark Liberty International Airport (EWR) in the neighboring state of New Jersey, and John F. Kennedy International Airport (JFK) in southern Queens.
  • Choosing between the two main airports in New York City is always challenging. If you want the less busy airport, book your flight at LaGuardia, but be prepared to be at least 30m from Times Square. If you want more options for public transportation to Manhattan, then opt for JFK, but be prepared for long lines at the airport.
  • If you're looking for flights to New York City operated by low-cost airlines, then you might be interested to know that John F. Kennedy International Airport is a hub for JetBlue. LaGuardia has fewer low-cost routes, but it's served by more airlines, including Frontier Airlines, Southwest Airlines, and Spirit Airlines.
  • If you’re looking for flights to upstate New York, search for nonstop flights into Buffalo Niagara International Airport (BUF), Albany International Airport (ALB), Syracuse Hancock International Airport (SYR), or Greater Rochester International Airport (ROC).
  • If you’re traveling to New York with pets, you’ll find pet relief areas in practically all major airports in the state.

Reviews of the top 5 airlines flying to New York

 
See real verified KAYAK customer reviews for airlines flying to New York State. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from the United States to New York State. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from the United States to New York? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8003 reviews
8.2Boarding
7.9Comfort
7.9Entertainment
8.5Crew
7.3Food
Airline reviews

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

6.0 GoodDavid, Oct 2025LAX - JFK
Read more Delta reviews

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Delta made it easy, comfortable and timely. The crew was fantastic.

On this flight I felt the food offering was not as complete as on previous flights. The tomato salad was a bit off and there was nothing additional such a bread or butter. The breakfast was only one option, so you either ate what they had or ate nothing. The crew was efficient, but most seemed frustrated throughout the flight. The flight arrived early and was obstacle-free, so I’m overall quite happy, but the shine in the rest of the experience just wasn’t there.

Great flight with Delta! Boarding was quick and easy, the amenities were solid, and the plane was in great shape. The flight attendants had a fun, lively energy while staying professional. All in all, a smooth trip — even managed to catch up on some rest. Thanks, Delta!

De planning was an absolute mess. We were never told that we weren’t at the gate and that we had to go down unstable stairs and then hop on a bus. People were falling, we couldn’t tell who was in charge. Overall terrible communication that ended up leaving a bad impression at the very end of the experience.

For a 69 year old with health problems I had the worse experience, no wheelchair when I entered a lady told me to sit and wait while a gentleman told me I had to walk to the Delta station, which I did. I had a carry on and a bag, and I was traveling with my service dog, which was on his carrier and the lady charged me for my carry on luggage, beside all the waiting cause of the delay, I had to walk to get my luggage cause no wheelchair showed up, I am so disappointed. I will get in touch with the company. I got home at 3:00 am, not good for my health situation.

Did not know my son and I had different seating arrangements. He was fine, but it was disappointing.

My flight was canceled after being rescheduled for four days canceling my trip. Kayak and everyone affiliated with it I.e the airlines, and just fly have been excruciating to deal with. My trip to visit family had to be canceled as there was no way to make it. I am furious at all of you.

They delayed our flight because of bad weather in NY which was completely understandable. Then they cancelled our flight and a later flight that evening. The earliest we could fly was the next morning. We ended up buying last minute tickets on another airline and made it home slightly delayed but safely that evening. Delta kept saying it was weather related but if that was the case how did we make it back on another airline? The weather in NY was cloudy but not bad.

I like for how they process during check in. It was very smoothly.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Short flight but an "eager to help" crew made the journey more enjoyable!

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

During booking, I kept trying submitting my payment from the Mexican website and it didn't work. After I had the idea to change it to the Canadian website, it worked but I had to be charged the equivalent of 50 CAD more. I received the clear instruction that I would only be able to check-in at the airport and that it was impossible to select a seat 24 hours before departure, that I had to pay 144 CAD to do so, although not only was I able to check-in 24 hours before departure, but I could have selected my seats for free then. All in all, I almost threw $200 out the window due to misleading information. Besides, the app kept crashing, the information to get to the gate on the app was inaccurate, my gate was switched and I was only informed once in the air (luckily I had noticed the departure pannel), I was not addressed in my language beforehand and even if I tried I was immediately answered in English (which meant the crew understood but didn't want to answer accordingly), there was only one snack & beverage service on my medium haul flight and no beverage service on my short haul flight. To be fair, the planes were comfortable, the crew apart from the language issue was helpful, dynamic and engaging, the plane was clean and the directions were clear and direct. United has a lot of potential to be one of my favourite airlines, but the devil is in the details and a lot of them missed the target.

There was no TV's on the plane? I tried to activated the WiFi multiple times before the plane took off but it wasn't work well.

Air Marco’s fleet of airplanes are old and pathetic. The seats are torn and stained. The monitors don’t work properly. If this wasn’t a business trip and I had control of booking the flight, I would not travel on this carrier.

Good service, friendly staff. Food was average for airlines and the seats were small.

Pathetic check in experience once again. Not enough staff scheduled at bag drop or for special assistance at LHR. Really need to rethink the whole self check in procedure. The crew was good. A very decent selection of special meals in this leg as compared to the JFK-LHR leg.

Flight was cancelled 3 hrs AFTER etd. Thetefore Missed connection from JFK to New Zealand . No accommodation provided… This cost ne aporox 1000 USD in extra expenses and turned whst should have been a 24 hr trip ftom Boston - New Zealand into a VERY expensive , late 70+ hr nightmare … Complete nonsense!!!

Overall fine, but the delay was annoying and the reasons for the delay were not communicated. The crew on board were phenomenal!

A cookie and a soda, packed like sardines, will never be a positive experience. Also, boarded a 5:30 flight at 7:45pm

Whenever a passenger purchase a ticket his advantage number should automatically to his information. It's not everyone remember the number. You request for your number and American airline agent say they will email it....and they never email anything and you loose your mileage just because you don't remember your number. It should automatically go your information and associate with your email account at all times

The flight was two hours late to take off. The captain kept making announcements in English, but the volume on the speakers was low and we could not hear him. The flight attendant’s French translation was loud and clear, but we couldn’t understand French. The crew was nowhere to be found to relay what the captain was announcing. Very frustrating experience. American has to do better.

Paid $35 and not able to access the internet at all.

Four plus hour flight delay in New York caused us to take off after 11:30pm. We didn’t arrive at our hotel until five hours after check in. Started the trip off feeling exhausted.

I don’t usually fly budget airlines or airlines in the United States. It was as good as any other airline. The seats are comfortable and the airline attendants are not rude & surly. Very nice flight (s).

They have the most inexperienced / rude flight staff I’ve encountered

I paid extra for a seat closer to the front. The TV didn’t work at all for the entire flight. Would have been nice to know before I purchased an “upgraded “ seat

Too many long delays with JetBlue. Worst major airline that serves JFK but unfortunately I keep going back because of the prices.

flight cancelled after 2 delays. left us sitting in JFK at 1am. no customer service to assist rebooking.

To not have food or proper snacks on a 5 hour flight was the worst.

Spend hours delayed with no food, water anything sitting on the aieplane with no ability to eat or use the restroom. My entire experience was the absolute worst. I will never fly jet Blue again.

It would have been nice if they had offered more than one set of snacks

Ground crew gave me interference about carrying a laptop and a small shoulder bag, even though I told them I traveled with them all the time. I then placed my laptop bag in my carryon and took out a medical device, and ground crew still tried to give interference. I had to remind them that medical devices don't count towards luggage limits. It was quite annoying and unne

Terrible. Flight cancelled with no reasoning and no flights to rebook. Employees were useless and did nothing to help. Did not even know where to retrieve luggage from the cancelled flight. Flyers beware.

No fault of Frontier staff: plane was very late, reached Orlando at 1 am, took a while to get luggage. Weather, gov financial shutdown impact on TSA, air controllers seemed to have multiple flights backed up. Frontier staff seemed to cope as gracefully as possible. It did reassure me that I and my new hip could adapt to travel challenges. Food/entertainment were irrelevant to my trip.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

Boarding was on time and plane departed as scheduled. There are obviously no amenities (food, drink, entertainment) on Frontier, but there also didn't seem to be any issues with luggage space either.

Inbound plane was on time and flight departed on time with no issues while boarding.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

i was unable to check in the flight. refund requested

It was well done. It was my first time flying with them and I was nervous b/c I have heard of many cancelled and/or delray flights. Everything went smoothly.

Just know that everything, and I mean everything is “ala cart”. 60$ just to put something in the overhead bin. I will never fly Frontier again nor do I recommend them to anyone else.

The single worst check in experience I could imagine. I’ll never do any business with Frontier or any affiliated company

Everything you need to know for your flight to New York

Cabin class types available on flights to New York

Cabin classes available on flights to New York. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.