HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Luton (LTN) to Copenhagen (CPH) from $43

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/26. 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.
LTN — CPH
Jun 9 — Jun 161
From?
To?
Sun 6/9
Sun 6/16
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Cheap flight deals from Luton to Copenhagen

Discover tips and strategies to find the most affordable flight options for your journey from Luton (LTN) to Copenhagen (CPH). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 4, 2024.

Popular in

May

Cheapest in

September

Round-trip from

$530

One-way from

$110
High demand for flights, 52% potential price rise
Search Deals
Best time to find cheap flights, 46% potential price drop
Search Deals
From London Luton to Kastrup Copenhagen
Search Deals
One-way flight from London Luton to Kastrup Copenhagen
Search Deals

How far in advance should I book a flight from London Luton Airport to Copenhagen?

Find a great deal and save up to 82% by booking at least 36 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from London Luton Airport to Copenhagen within the next two weeks, with the cheapest ticket starting at $146.

What is the cheapest month to fly from London Luton Airport to Copenhagen?

Flights from London Luton Airport to Copenhagen lean towards being more expensive in July. Prices are generally better when you fly from London Luton Airport to Copenhagen in January, with the cheapest ticket starting at $33.

What is the cheapest time of day to fly from LTN to CPH?

When flying from London Luton Airport to Copenhagen, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Cheap Wizz Air flights from Luton to Copenhagen

Explore cheap flight options specifically provided by Wizz Air for the route between Luton and Copenhagen. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
Check out some of the cheapest Wizz Air flights we've come across from London to Copenhagen. It's recommended that users confirm their flight details before booking.
Tue 6/119:20 pmLTN - CPH
1 stop14h 10mWizz Air
Wed 6/1210:45 pmCPH - LTN
1 stop9h 50mWizz Air
Deal found 6/2$112
Sat 7/69:20 pmLTN - CPH
1 stop14h 10mWizz Air
Wed 7/101:00 pmCPH - LTN
1 stop8h 40mWizz Air
Deal found 6/3$126
Tue 7/97:50 pmLTN - CPH
1 stop14h 10mWizz Air
Tue 7/161:00 pmCPH - LTN
1 stop8h 40mWizz Air
Deal found 6/3$130
Mon 6/249:20 pmLTN - CPH
1 stop14h 10mWizz Air
Mon 7/12:35 pmCPH - LTN
1 stop7h 05mWizz Air
Deal found 6/3$137
Tue 7/29:20 pmLTN - CPH
1 stop14h 10mWizz Air
Tue 7/91:00 pmCPH - LTN
1 stop8h 40mWizz Air
Deal found 6/4$143
Mon 7/19:20 pmLTN - CPH
1 stop14h 10mWizz Air
Mon 7/82:35 pmCPH - LTN
1 stop7h 05mWizz Air
Deal found 6/3$150
Wed 6/198:20 amLTN - CPH
1 stop12h 55mWizz Air
Sun 6/234:00 pmCPH - LTN
1 stop16h 35mWizz Air
Deal found 6/4$153
Sat 7/69:20 pmLTN - CPH
1 stop14h 10mWizz Air
Mon 7/82:35 pmCPH - LTN
1 stop7h 05mWizz Air
Deal found 6/4$174
Sat 6/229:20 pmLTN - CPH
1 stop14h 10mWizz Air
Sun 6/234:00 pmCPH - LTN
1 stop16h 35mWizz Air
Deal found 6/3$176

Cheap SunExpress flights from Luton to Copenhagen

Explore cheap flight options specifically provided by SunExpress for the route between Luton and Copenhagen. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
Browse through some of the cheapest SunExpress flights traveling from London to Copenhagen. Check back soon if you're not seeing flights that suit your needs.
Tue 7/94:55 pmLTN - CPH
1 stop15h 00mSunExpress
Mon 7/151:20 amCPH - LTN
1 stop15h 20mSunExpress
Deal found 6/3$653
Tue 7/24:55 pmLTN - CPH
1 stop15h 00mSunExpress
Mon 7/81:20 amCPH - LTN
1 stop15h 20mSunExpress
Deal found 6/4$687

Cheap Luton to Copenhagen flights in June & July 2024

Find cheap flight options from Luton to Copenhagen specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,009,960 searches. Prices were last updated on June 4, 2024.
Scroll through some of the best deals on flights from London to Copenhagen in 2024. Check back soon for alternative fares.
Tue 6/119:20 pmLTN - CPH
1 stop14h 10mWizz Air
Wed 6/1210:45 pmCPH - LTN
1 stop9h 50mWizz Air
Deal found 6/2$112
Sat 7/69:20 pmLTN - CPH
1 stop14h 10mWizz Air
Wed 7/101:00 pmCPH - LTN
1 stop8h 40mWizz Air
Deal found 6/3$126
Tue 7/97:50 pmLTN - CPH
1 stop14h 10mWizz Air
Tue 7/161:00 pmCPH - LTN
1 stop8h 40mWizz Air
Deal found 6/3$130
Mon 6/249:20 pmLTN - CPH
1 stop14h 10mWizz Air
Mon 7/12:35 pmCPH - LTN
1 stop7h 05mWizz Air
Deal found 6/3$137
Tue 7/910:45 amLTN - CPH
2 stops10h 00mMultiple Airlines
Tue 7/161:00 pmCPH - LTN
1 stop8h 40mMultiple Airlines
Deal found 6/3$141
Tue 7/29:20 pmLTN - CPH
1 stop14h 10mWizz Air
Tue 7/91:00 pmCPH - LTN
1 stop8h 40mWizz Air
Deal found 6/4$143
Mon 7/19:20 pmLTN - CPH
1 stop14h 10mWizz Air
Mon 7/82:35 pmCPH - LTN
1 stop7h 05mWizz Air
Deal found 6/3$150
Sat 6/88:35 amLTN - CPH
1 stop7h 10mWizz Air
Wed 6/1210:45 pmCPH - LTN
1 stop9h 50mWizz Air
Deal found 6/4$153
Sun 6/99:55 pmLTN - CPH
1 stop9h 10mWizz Air
Fri 7/1210:15 pmCPH - LTN
1 stop10h 20mWizz Air
Deal found 6/4$155

Luton to Copenhagen 2024 flight deals

Discover exclusive flight deals for travel between Luton and Copenhagen in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
Scroll through some of the best deals on flights from London to Copenhagen in 2024. Check back soon for alternative fares.
Mon 9/29:20 pmLTN - CPH
1 stop14h 10mMultiple Airlines
Tue 9/1010:20 amCPH - LTN
1 stop7h 35mMultiple Airlines
Deal found 6/3$102
Tue 6/119:20 pmLTN - CPH
1 stop14h 10mWizz Air
Wed 6/1210:45 pmCPH - LTN
1 stop9h 50mWizz Air
Deal found 6/2$112
Sat 7/69:20 pmLTN - CPH
1 stop14h 10mWizz Air
Wed 7/101:00 pmCPH - LTN
1 stop8h 40mWizz Air
Deal found 6/3$126
Tue 7/97:50 pmLTN - CPH
1 stop14h 10mWizz Air
Tue 7/161:00 pmCPH - LTN
1 stop8h 40mWizz Air
Deal found 6/3$130
Mon 6/249:20 pmLTN - CPH
1 stop14h 10mWizz Air
Mon 7/12:35 pmCPH - LTN
1 stop7h 05mWizz Air
Deal found 6/3$137
Tue 7/910:45 amLTN - CPH
2 stops10h 00mMultiple Airlines
Tue 7/161:00 pmCPH - LTN
1 stop8h 40mMultiple Airlines
Deal found 6/3$141
Tue 7/29:20 pmLTN - CPH
1 stop14h 10mWizz Air
Tue 7/91:00 pmCPH - LTN
1 stop8h 40mWizz Air
Deal found 6/4$143
Mon 7/19:20 pmLTN - CPH
1 stop14h 10mWizz Air
Mon 7/82:35 pmCPH - LTN
1 stop7h 05mWizz Air
Deal found 6/3$150
Sat 6/88:35 amLTN - CPH
1 stop7h 10mWizz Air
Wed 6/1210:45 pmCPH - LTN
1 stop9h 50mWizz Air
Deal found 6/4$153

Luton to Copenhagen flights leaving soon

Find last-minute flight options from Luton to Copenhagen for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
Book one of these great deals on flights from London to Copenhagen. Users should examine the flight details to ensure there are no surprises.
Tue 6/119:20 pmLTN - CPH
1 stop14h 10mWizz Air
Wed 6/1210:45 pmCPH - LTN
1 stop9h 50mWizz Air
Deal found 6/2$112
Tue 6/117:20 amLTN - CPH
1 stop12h 05measyJet
Wed 6/129:20 amCPH - LTN
1 stop13h 00measyJet
Deal found 6/3$189
Tue 6/119:20 pmLTN - CPH
1 stop14h 10mMultiple Airlines
Wed 6/123:30 pmCPH - LTN
2 stops17h 10mMultiple Airlines
Deal found 6/2$197
Fri 6/142:20 pmLTN - CPH
1 stop5h 55mWizz Air
Sun 6/1610:30 pmCPH - LTN
1 stop10h 05mWizz Air
Deal found 6/3$248
Sun 6/96:55 pmLTN - CPH
1 stop13h 05measyJet
Wed 6/129:20 amCPH - LTN
1 stop13h 00measyJet
Deal found 6/3$278
Fri 6/1410:30 amLTN - CPH
1 stop5h 00mMultiple Airlines
Sun 6/1610:30 pmCPH - LTN
1 stop10h 05mMultiple Airlines
Deal found 6/3$283
Wed 6/56:05 amLTN - CPH
1 stop7h 45measyJet
Thu 6/69:55 amCPH - LTN
1 stop9h 20measyJet
Deal found 6/3$323
Fri 6/145:40 pmLTN - CPH
2 stops14h 10mMultiple Airlines
Sun 6/164:00 pmCPH - LTN
1 stop16h 35mMultiple Airlines
Deal found 6/3$336
Sat 6/156:05 amLTN - CPH
1 stop7h 00measyJet
Thu 6/2010:20 amCPH - LTN
1 stop7h 20measyJet
Deal found 6/3$340

One-way flights to Copenhagen from Luton

Search for one-way flight options from Luton to Copenhagen. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.
Users traveling one-way from London to Copenhagen can select one of these great deals. Users can also find round-trip London to Copenhagen flights by using the search form above.
Mon 8/269:20 pmLTN - CPH
1 stop14h 10mWizz Air
Deal found 6/4$43
Tue 7/27:50 pmLTN - CPH
1 stop14h 10mWizz Air
Deal found 6/4$59
Wed 7/39:20 pmLTN - CPH
1 stop15h 20mWizz Air
Deal found 6/3$62
Mon 6/109:20 pmLTN - CPH
1 stop14h 10mWizz Air
Deal found 6/3$64
Wed 7/37:50 pmLTN - CPH
1 stop23h 00mWizz Air
Deal found 6/4$65
Tue 7/97:50 pmLTN - CPH
1 stop14h 10mWizz Air
Deal found 6/3$69
Thu 8/229:55 pmLTN - CPH
1 stop22h 50mWizz Air
Deal found 6/4$71
Tue 6/259:20 pmLTN - CPH
1 stop10h 35mMultiple Airlines
Deal found 6/3$73
Wed 8/219:20 pmLTN - CPH
1 stop15h 20mWizz Air
Deal found 6/2$74

Find flights from Luton to Copenhagen within your budget

Customize your flight search to find flights from Luton to Copenhagen that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 3,009,960 searches. Data last updated June 4, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$102 - $167

Route

Depart

Return

Price

London LutonKastrup Copenhagen

LTN - CPH

LTNCPH

London Luton

Mon 9/2

1 stop14h 10m

Kastrup Copenhagen

Tue 9/10

1 stop7h 35m

$102

London LutonKastrup Copenhagen

LTN - CPH

LTNCPH

London Luton

Sat 7/6

1 stop14h 10m

Kastrup Copenhagen

Wed 7/10

1 stop8h 40m

$126

London LutonKastrup Copenhagen

LTN - CPH

LTNCPH

London Luton

Tue 7/9

1 stop14h 10m

Kastrup Copenhagen

Tue 7/16

1 stop8h 40m

$130

London LutonKastrup Copenhagen

LTN - CPH

LTNCPH

London Luton

Mon 6/24

1 stop14h 10m

Kastrup Copenhagen

Mon 7/1

1 stop7h 05m

$137

London LutonKastrup Copenhagen

LTN - CPH

LTNCPH

London Luton

Tue 7/9

2 stops10h 00m

Kastrup Copenhagen

Tue 7/16

1 stop8h 40m

$141

London LutonKastrup Copenhagen

LTN - CPH

LTNCPH

London Luton

Tue 7/2

1 stop14h 10m

Kastrup Copenhagen

Tue 7/9

1 stop8h 40m

$143

London LutonKastrup Copenhagen

LTN - CPH

LTNCPH

London Luton

Tue 7/2

1 stop14h 10m

Kastrup Copenhagen

Tue 7/9

2 stops24h 05m

$159

London LutonKastrup Copenhagen

LTN - CPH

LTNCPH

London Luton

Tue 7/2

1 stop13h 25m

Kastrup Copenhagen

Wed 7/24

1 stop5h 30m

$162

London LutonKastrup Copenhagen

LTN - CPH

LTNCPH

London Luton

Mon 9/23

1 stop5h 55m

Kastrup Copenhagen

Thu 9/26

1 stop13h 35m

$167

Flights are sorted by cheapest first

Deals found on 6/3

No data available for this route at this time. Please check back soon.

Best time to book a flight from Luton to Copenhagen

Have a flexible travel schedule? Discover the best time to fly to Copenhagen from Luton with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in Copenhagen by month

Plan your trip to Copenhagen by taking into account the average temperature and rainfall totals by month.

CPH

Temperature

32 - 60.8 °F

If weather is an important factor for your trip to Copenhagen, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 60.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing Copenhagen

Get insights into the airlines that provide service to Copenhagen. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Copenhagen. Reviews last updated June 4, 2024.
To help decide which airline to fly from London to Copenhagen, see what other customers have to say about Wizz Air, SunExpress and easyJet. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
easyJet
6.9
Okay
2,493 reviews
Check prices

Comfort

6.7

Food

6.0

Boarding

6.7

Entertainment

5.5

Overall

6.9

Crew

7.6

Reviews

1 / 10

Unfair rating system. Ours was a short flight, so we didn't have any food, and there was no entertainment.

easyJet
6.9
Okay
2,493 reviews
easyJet
6.9
Okay
2,493 reviews
Check prices

Comfort

6.7

Food

6.0

Boarding

6.7

Entertainment

5.5

Overall

6.9

Crew

7.6

Reviews

1 / 10

Unfair rating system. Ours was a short flight, so we didn't have any food, and there was no entertainment.

Wizz Air
6.9
Okay
1,197 reviews
easyJet
6.9
Okay
2,493 reviews
Check prices

Comfort

6.7

Food

6.0

Boarding

6.7

Entertainment

5.5

Overall

6.9

Crew

7.6

Reviews

1 / 10

Unfair rating system. Ours was a short flight, so we didn't have any food, and there was no entertainment.

SunExpress
6.6
Okay
162 reviews
easyJet
6.9
Okay
2,493 reviews
Check prices

Comfort

6.7

Food

6.0

Boarding

6.7

Entertainment

5.5

Overall

6.9

Crew

7.6

Reviews

1 / 10

Unfair rating system. Ours was a short flight, so we didn't have any food, and there was no entertainment.

Related info for your journey

Find useful and relevant information for your journey from Luton to Copenhagen. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Copenhagen from London Luton?

    If you book a flight to Copenhagen from London Luton, you will be flying to Kastrup Copenhagen, which is the city’s only airport. Kastrup Copenhagen (CPH) is located 5.0 mi from the center of Copenhagen. There are 0 flights from London Luton to Kastrup Copenhagen per day from 0 different airlines.

  • Can I find flights from London Luton Airport to Copenhagen for under $200 on Cheapflights?

    Yes, there are multiple flights from London Luton Airport to Copenhagen for under $200. The cheapest flight booked recently is on Multiple Airlines for just $102, but on average you can expect to pay $164.

  • Are there last-minute flights available from London Luton Airport to Copenhagen for under $200?

    There are currently 10+ open flights from London Luton Airport to Copenhagen within the next 7 days for less than $200.

  • What are the cheapest airlines flying from London Luton Airport to Copenhagen round-trip?

    Wizz Air, at $126, was found to be the cheapest airline from London Luton Airport to Copenhagen. An alternate airline flying to your destination would be easyJet. Wizz Air is currently priced 20% below the average price you’ll pay for this route.

  • What does LTN to CPH mean?

    LTN and CPH are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. LTN to CPH refers to a flight route from London Luton Airport to Kastrup Copenhagen Airport.

  • Can I find deals for flights from Luton to Copenhagen that include extra baggage allowance?

    The amount of baggage you can bring on your Luton to Copenhagen flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Luton to Copenhagen with specific airlines?

    Yes, Cheapflights allows you to browse and filter Luton to Copenhagen flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Luton to Copenhagen that include hotel bookings?

    Yes. In addition to deals on Luton to Copenhagen flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Luton to Copenhagen?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Luton to Copenhagen.

  • Can I find deals for business class flights from Luton to Copenhagen?

    Yes. Cheapflights offers flight deals from Luton to Copenhagen by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Luton to Copenhagen that allow pets onboard?

    Many airlines flying from Luton to Copenhagen offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Luton to Copenhagen?

    Yes, you can often find last-minute deals on Luton to Copenhagen flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the London Luton Airport to Copenhagen flight deals updated?

    The London Luton Airport to Copenhagen flight deals you see on this page were last updated on 6/4.

  • What is the cheapest month to book a flight from London Luton Airport to Copenhagen?

    Currently, January is the cheapest month in which you can book a flight from London Luton Airport to Copenhagen (average of $530). Flying from London Luton Airport to Copenhagen in June is currently the most expensive (average of $1,006). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Luton to Copenhagen
See prices for flight routes from nearby airports that may be better suited for you.

Gatwick to Copenhagen flights
Heathrow to Copenhagen flights
USA to Sweden flights
Chicago to Nashville flights
San Diego to San Francisco flights
San Jose to San Diego flights
Detroit to San Francisco flights
San Francisco to Shanghai flights
USA to Ireland flights
Atlanta to Orlando flights
Seattle to London flights
New York LaGuardia Airport to Orlando flights
Newark Airport to Cancún flights
London Luton Airport to Craiova flights

Search flights from Luton to Copenhagen by cabin class

Find flights from Luton to Copenhagen, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Gaziantep
Flights to Miyakojima Hirara
Flights to Figari-Sud Corse
Flights to Mason City
Flights to Komatsu
Flights to Sendai
Flights to Rhinelander Oneida County
Flights to Constanţa Mihail Kogalniceanu
Flights to Brainerd Crow Wing County
Flights to Reus
Flights to Virac
Flights to Neiva La Marguita
Flights to Pellston Emmet County
Flights to Urumqi
Flights to Bastia Poretta
Flights to Samos
Flights to Hyannis Barnstable
Flights to Provincetown
Flights to Alghero-Fertilia
Flights to Laayoune Hassan I
Flights to Devils Lake
Flights to Vava'u Lupepau'U
Flights to Hakodate
Flights to Edremit/Korfez

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Luton to Copenhagen?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Luton to Copenhagen. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Luton to Copenhagen?

Cheapflights simply makes it quick and affordable to book flights from Luton to Copenhagen by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Luton to Copenhagen with no change fees?

Yes! Cheapflights helps users easily find flights from Luton to Copenhagen with no change fees.

Can Cheapflights notify me if prices for flights from Luton to Copenhagen become cheaper?

Not ready to book yet? You can track prices for flights from Luton to Copenhagen on Cheapflights with our Price Alert feature and get notified when better prices are available.

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines