HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Denver to Nantucket (DEN - ACK) from $100

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 6/17. 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.
DEN — ACK
May 3 — May 101
From?
To?
Fri 5/3
Fri 5/10
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Cheap flight deals from Denver to Nantucket

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Nantucket (ACK). 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 April 28, 2024.

Round-trip from

$218
From Denver Intl to Nantucket Memorial
Search Deals

What is the cheapest day to fly round-trip from Denver to Nantucket?

Users have found that flying from Denver to Nantucket on a Tuesday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

How far in advance should I book a flight from Denver to Nantucket?

Travelers have found it’s best to book a flight 46 days in advance to save up to 27% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 46 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Denver to Nantucket 1-2 weeks in advance for as low as $303, or $381 for flights within the next 24 hours.

What is the cheapest month to fly from Denver to Nantucket?

The best pricing can be found in the month of January. Prices to Nantucket from Denver average $361. You can even find prices in January for less than $361, as users have found deals to Nantucket from as low as $138. The month of June appears to be one of the more expensive times to travel to Nantucket from Denver. Flying in the targeted month can save you up to 33%.

When is the cheapest time to fly from Denver to Nantucket (DEN - ACK)?

One of the essential ways to save on airfare from Denver to Nantucket is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 24% on airfare.

Cheap Delta flights from Denver to Nantucket

Explore cheap flight options specifically provided by Delta for the route between Denver and Nantucket. 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 2,944,896 searches. Data last updated April 28, 2024.
Check out some of the cheapest Delta flights we've come across from Denver to Nantucket. Make sure to double check the flight details before booking.
Tue 7/166:45 amDEN - ACK
1 stop6h 32mDelta
Wed 7/1711:39 amACK - DEN
1 stop7h 10mDelta
Deal found 4/27$307
Tue 7/166:45 amDEN - ACK
1 stop6h 32mDelta
Wed 7/1711:39 amACK - DEN
2 stops14h 20mDelta
Deal found 4/27$312
Tue 7/166:45 amDEN - ACK
1 stop6h 32mDelta
Wed 7/1711:39 amACK - DEN
2 stops12h 59mDelta
Deal found 4/26$336
Tue 7/166:45 amDEN - ACK
1 stop6h 32mDelta
Wed 7/1711:39 amACK - DEN
1 stop7h 10mDelta
Deal found 4/26$338
Tue 5/287:12 amDEN - ACK
1 stop6h 36mDelta
Tue 6/412:02 pmACK - DEN
2 stops11h 07mDelta
Deal found 4/28$343
Mon 7/1512:30 amDEN - ACK
2 stops11h 35mDelta
Wed 7/1711:39 amACK - DEN
2 stops14h 20mDelta
Deal found 4/27$348
Tue 5/287:12 amDEN - ACK
1 stop6h 36mDelta
Tue 6/412:02 pmACK - DEN
1 stop6h 20mDelta
Deal found 4/28$358
Mon 7/1512:30 amDEN - ACK
2 stops11h 35mDelta
Wed 7/1711:39 amACK - DEN
2 stops12h 59mDelta
Deal found 4/26$361
Mon 7/1512:30 amDEN - ACK
2 stops11h 35mDelta
Wed 7/1711:39 amACK - DEN
1 stop7h 10mDelta
Deal found 4/26$363

Cheap United Airlines flights from Denver to Nantucket

Explore cheap flight options specifically provided by United Airlines for the route between Denver and Nantucket. 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 2,944,896 searches. Data last updated April 28, 2024.
To aid your search, here are some of the cheapest United Airlines flights we've found from Denver to Nantucket. Deals frequently update to provide users with more options.
Fri 5/248:28 pmDEN - ACK
1 stop16h 00mUnited Airlines
Fri 5/314:15 pmACK - DEN
1 stop8h 37mUnited Airlines
Deal found 4/28$485
Sat 9/711:59 pmDEN - ACK
1 stop7h 06mUnited Airlines
Sat 9/144:30 pmACK - DEN
1 stop6h 45mUnited Airlines
Deal found 4/27$538
Sun 9/111:59 pmDEN - ACK
1 stop7h 06mUnited Airlines
Sat 9/144:30 pmACK - DEN
1 stop6h 45mUnited Airlines
Deal found 4/27$543
Tue 5/285:38 pmDEN - ACK
2 stops14h 17mUnited Airlines
Tue 6/410:35 amACK - DEN
2 stops15h 24mUnited Airlines
Deal found 4/28$554
Fri 5/248:52 pmDEN - ACK
2 stops15h 36mUnited Airlines
Fri 5/314:15 pmACK - DEN
1 stop8h 37mUnited Airlines
Deal found 4/28$562
Sun 9/111:59 pmDEN - ACK
1 stop7h 06mUnited Airlines
Sat 9/144:30 pmACK - DEN
2 stops19h 39mUnited Airlines
Deal found 4/27$591
Sun 9/111:59 pmDEN - ACK
1 stop7h 06mUnited Airlines
Sat 9/144:30 pmACK - DEN
2 stops16h 23mUnited Airlines
Deal found 4/28$594
Sat 9/711:59 pmDEN - ACK
1 stop7h 06mUnited Airlines
Sat 9/144:30 pmACK - DEN
2 stops19h 38mUnited Airlines
Deal found 4/27$609
Tue 7/26:41 amDEN - ACK
1 stop6h 52mUnited Airlines
Mon 7/84:18 pmACK - DEN
1 stop7h 05mUnited Airlines
Deal found 4/27$1,509

Cheap Denver to Nantucket flights in April & May 2024

Find cheap flight options from Denver to Nantucket specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,944,896 searches. Prices were last updated on April 28, 2024.
Scroll through some of the best deals on flights from Denver to Nantucket in 2024. If these deals don't appeal to you, be sure to come back soon for more options.
Tue 5/287:12 amDEN - ACK
1 stop6h 36mDelta
Tue 6/412:02 pmACK - DEN
2 stops11h 07mDelta
Deal found 4/28$343
Tue 5/287:12 amDEN - ACK
1 stop6h 36mDelta
Tue 6/412:02 pmACK - DEN
1 stop6h 20mDelta
Deal found 4/28$358
Mon 5/2712:30 amDEN - ACK
2 stops8h 48mDelta
Tue 6/412:02 pmACK - DEN
2 stops11h 07mDelta
Deal found 4/28$408
Mon 5/2712:30 amDEN - ACK
2 stops8h 48mDelta
Tue 6/412:02 pmACK - DEN
1 stop6h 20mDelta
Deal found 4/28$423
Fri 5/248:28 pmDEN - ACK
1 stop16h 00mUnited Airlines
Fri 5/314:15 pmACK - DEN
1 stop8h 37mUnited Airlines
Deal found 4/28$485
Tue 5/285:38 pmDEN - ACK
2 stops14h 17mUnited Airlines
Tue 6/410:35 amACK - DEN
2 stops15h 24mUnited Airlines
Deal found 4/28$554
Fri 5/248:52 pmDEN - ACK
2 stops15h 36mUnited Airlines
Fri 5/314:15 pmACK - DEN
1 stop8h 37mUnited Airlines
Deal found 4/28$562
Tue 5/285:37 pmDEN - ACK
2 stops13h 58mMultiple Airlines
Tue 6/47:00 amACK - DEN
2 stops11h 37mMultiple Airlines
Deal found 4/28$1,130
Fri 5/247:48 pmDEN - ACK
2 stops14h 34mDelta
Fri 5/3112:02 pmACK - DEN
2 stops11h 07mDelta
Deal found 4/28$1,496

Denver to Nantucket 2024 flight deals

Discover exclusive flight deals for travel between Denver and Nantucket in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,944,896 searches. Data last updated April 28, 2024.
Scroll through some of the best deals on flights from Denver to Nantucket in 2024. If these deals don't appeal to you, be sure to come back soon for more options.
Tue 7/166:45 amDEN - ACK
1 stop6h 32mDelta
Wed 7/1711:39 amACK - DEN
1 stop7h 10mDelta
Deal found 4/27$307
Fri 6/2111:59 pmDEN - ACK
1 stop8h 21mJetBlue
Mon 6/244:45 pmACK - DEN
1 stop8h 08mJetBlue
Deal found 4/28$309
Tue 7/166:45 amDEN - ACK
1 stop6h 32mDelta
Wed 7/1711:39 amACK - DEN
2 stops14h 20mDelta
Deal found 4/27$312
Tue 7/166:45 amDEN - ACK
1 stop6h 32mDelta
Wed 7/1711:39 amACK - DEN
2 stops12h 59mDelta
Deal found 4/26$336
Tue 7/166:45 amDEN - ACK
1 stop6h 32mDelta
Wed 7/1711:39 amACK - DEN
1 stop7h 10mDelta
Deal found 4/26$338
Tue 5/287:12 amDEN - ACK
1 stop6h 36mDelta
Tue 6/412:02 pmACK - DEN
2 stops11h 07mDelta
Deal found 4/28$343
Mon 7/1512:30 amDEN - ACK
2 stops11h 35mDelta
Wed 7/1711:39 amACK - DEN
2 stops14h 20mDelta
Deal found 4/27$348
Tue 5/287:12 amDEN - ACK
1 stop6h 36mDelta
Tue 6/412:02 pmACK - DEN
1 stop6h 20mDelta
Deal found 4/28$358
Mon 7/1512:30 amDEN - ACK
2 stops11h 35mDelta
Wed 7/1711:39 amACK - DEN
2 stops12h 59mDelta
Deal found 4/26$361

One-way flights to Nantucket from Denver

Search for one-way flight options from Denver to Nantucket. 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 2,944,896 searches. Data last updated April 28, 2024.
If you're seeking multiple options on one-way flights from Denver to Nantucket, be sure to check out these deals, which are updated often. Users needing a return flight from Denver to Nantucket should utilize the search form above.
Mon 6/1711:59 pmDEN - ACK
1 stop8h 21mJetBlue
Deal found 4/27$100
Tue 6/186:50 amDEN - ACK
1 stop6h 24mDelta
Deal found 4/27$144
Mon 6/1712:55 amDEN - ACK
2 stops12h 19mDelta
Deal found 4/27$149
Sun 6/1611:59 pmDEN - ACK
1 stop8h 21mJetBlue
Deal found 4/27$170
Sun 6/1612:55 amDEN - ACK
2 stops11h 12mDelta
Deal found 4/27$229
Thu 7/2511:59 pmDEN - ACK
2 stops14h 59mAmerican Airlines
Deal found 4/28$262
Thu 6/2711:59 pmDEN - ACK
2 stops15h 01mAmerican Airlines
Deal found 4/27$311
Thu 6/2711:48 pmDEN - ACK
1 stop9h 17mJetBlue
Deal found 4/27$315
Thu 7/256:45 amDEN - ACK
1 stop6h 32mDelta
Deal found 4/28$324

Find flights from Denver to Nantucket within your budget

Customize your flight search to find flights from Denver to Nantucket 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 2,944,896 searches. Data last updated April 28, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$307 - $485

Route

Depart

Return

Price

Denver IntlNantucket Memorial

DEN - ACK

DENACK

Denver Intl

Tue 7/16

1 stop6h 32m

Nantucket Memorial

Wed 7/17

1 stop7h 10m

$307

Denver IntlNantucket Memorial

DEN - ACK

DENACK

Denver Intl

Fri 6/21

1 stop8h 21m

Nantucket Memorial

Tue 6/25

1 stop7h 15m

$309

Denver IntlNantucket Memorial

DEN - ACK

DENACK

Denver Intl

Tue 7/16

1 stop6h 32m

Nantucket Memorial

Wed 7/17

2 stops14h 20m

$312

Denver IntlNantucket Memorial

DEN - ACK

DENACK

Denver Intl

Tue 7/16

1 stop6h 32m

Nantucket Memorial

Wed 7/17

2 stops12h 59m

$336

Denver IntlNantucket Memorial

DEN - ACK

DENACK

Denver Intl

Tue 7/16

1 stop6h 32m

Nantucket Memorial

Wed 7/17

1 stop7h 10m

$338

Denver IntlNantucket Memorial

DEN - ACK

DENACK

Denver Intl

Tue 5/28

1 stop6h 36m

Nantucket Memorial

Tue 6/4

2 stops11h 07m

$343

Denver IntlNantucket Memorial

DEN - ACK

DENACK

Denver Intl

Sat 6/22

2 stops17h 00m

Nantucket Memorial

Tue 6/25

1 stop7h 04m

$397

Denver IntlNantucket Memorial

DEN - ACK

DENACK

Denver Intl

Thu 6/20

2 stops15h 01m

Nantucket Memorial

Sat 6/22

1 stop6h 56m

$400

Denver IntlNantucket Memorial

DEN - ACK

DENACK

Denver Intl

Fri 5/24

1 stop16h 00m

Nantucket Memorial

Fri 5/31

1 stop8h 37m

$485

Flights are sorted by cheapest first

Deals found on 4/27

When is the cheapest time to fly from Denver to Nantucket?

Use this chart to determine the cheapest time to fly round-trip from Denver to Nantucket. Price data was last updated on April 28, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Denver to Nantucket flight should consider departing on Tuesday evenings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Nantucket by month

Plan your trip from Denver to Nantucket by taking into account the cheapest months to travel. The average price of a one-way flight from Denver to Nantucket is currently $223 while a round-trip flight costs $359. Price data was last updated on April 28, 2024.

Temperature and rainfall in Nantucket by month

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

BOS

Temperature

30.2 - 73.4 °F

Reviews of airlines servicing Nantucket

Get insights into the airlines that provide service to Nantucket. 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 Nantucket. Reviews last updated April 28, 2024.
See what other customers who have flown with Delta, United Airlines and American Airlines from Denver to Nantucket have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,932 reviews
Check prices

Boarding

8.2

Overall

8.1

Crew

8.6

Entertainment

8.0

Food

7.4

Comfort

7.9

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Delta
8.1
Very good
10,932 reviews
Delta
8.1
Very good
10,932 reviews
Check prices

Boarding

8.2

Overall

8.1

Crew

8.6

Entertainment

8.0

Food

7.4

Comfort

7.9

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

JetBlue
7.6
Good
4,582 reviews
Delta
8.1
Very good
10,932 reviews
Check prices

Boarding

8.2

Overall

8.1

Crew

8.6

Entertainment

8.0

Food

7.4

Comfort

7.9

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

United Airlines
7.4
Good
11,221 reviews
Delta
8.1
Very good
10,932 reviews
Check prices

Boarding

8.2

Overall

8.1

Crew

8.6

Entertainment

8.0

Food

7.4

Comfort

7.9

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

American Airlines
7.3
Good
14,844 reviews
Delta
8.1
Very good
10,932 reviews
Check prices

Boarding

8.2

Overall

8.1

Crew

8.6

Entertainment

8.0

Food

7.4

Comfort

7.9

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Related info for your journey

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

  • Can I find flights from Denver to Nantucket for under $400 on Cheapflights?

    Yes, there are multiple flights from Denver to Nantucket for under $400. The cheapest flight booked recently is on Delta for just $307, but on average you can expect to pay $400.

  • What are the cheapest airlines flying from Denver to Nantucket round-trip?

    Currently priced at $307, Delta will fly you from Denver to Nantucket and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from JetBlue and American Airlines - these airlines can fly you to your destination from $309 and $397, respectively.

  • What are the cheapest airlines to fly from Denver to Nantucket one-way?

    To fly one-way, consider booking your trip with JetBlue, which is currently one of the cheapest options available, starting at $100. Delta flights start at $144 while deals on American Airlines start at $262 one-way.

  • What are the most popular airlines that fly from Denver to Nantucket?

    Consider American Airlines, JetBlue or Delta when booking your flight. These represent the most popular airlines when flying from Denver to Nantucket.

  • What does DEN to ACK mean?

    Great question - DEN to ACK just means Denver Intl Airport to Nantucket Memorial Airport. Now you’ll know what these unique codes when you look for flights!

  • Can I find deals for flights from Denver to Nantucket that include extra baggage allowance?

    The amount of baggage you can bring on your Denver to Nantucket 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 Denver to Nantucket with specific airlines?

    Yes, Cheapflights allows you to browse and filter Denver to Nantucket 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 Denver to Nantucket that include hotel bookings?

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

  • How can I find direct flights from Denver to Nantucket?

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

  • Can I find deals for business class flights from Denver to Nantucket?

    Yes. Cheapflights offers flight deals from Denver to Nantucket 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 Denver to Nantucket that allow pets onboard?

    Many airlines flying from Denver to Nantucket 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 Denver to Nantucket?

    Yes, you can often find last-minute deals on Denver to Nantucket 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 Denver to Nantucket flight deals updated?

    The Denver to Nantucket flight deals you see on this page were last updated on 4/28.

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 Denver to Nantucket
See prices for flight routes from nearby airports that may be better suited for you.

Denver to Boston flights
Colorado Springs to Boston flights
Denver to West Tisbury flights
Durango to Boston flights
Aspen to Boston flights
Grand Junction to Boston flights
Denver to Worcester flights
Vail to Boston flights
Montrose to Boston flights
Hayden to Boston flights
Aspen to Nantucket flights
Colorado Springs to Nantucket flights
Gunnison to Boston flights
Denver to New Bedford flights
Denver to Provincetown flights
Grand Junction to Nantucket flights

Top 4 airlines flying from Denver to Nantucket

Discover the top 4 airlines that operate flights from Denver to Nantucket. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,944,896 searches. Data last updated April 28, 2024.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$183Average$398FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
DeltaCheapest$258Average$463FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$268Average$594FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$532Average$840FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Los Angeles to Denver flights
Pensacola to Orlando flights
Los Angeles to Tokyo flights
New York to Charlotte flights
Atlanta to Los Angeles flights
Dallas to Phoenix flights
Los Angeles to Bali flights
Dallas to Austin flights
Orlando to Nashville flights
Seattle to Phoenix flights
Los Angeles to Chicago O'Hare Intl Airport flights
Denver to Waco flights

Search flights from Denver to Nantucket by cabin class

Find flights from Denver to Nantucket, 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 Perugia Sant Egidio
Flights to Biarritz Parme
Flights to Argostoli Cephalonia
Flights to Melilla
Flights to Milas–Bodrum
Flights to Girona Costa Brava
Flights to Hakodate
Flights to Fez Sais
Flights to Constantine Ain El Bey
Flights to Zakynthos Dionsios Salomos
Flights to Bourgas
Flights to Bodø
Flights to Reggio Calabria Tito Menniti
Flights to Bastia Poretta
Flights to Skiathos
Flights to Kalamata
Flights to Batumi
Flights to Menorca/Mahon
Flights to Kristiansand Kjevik
Flights to Champaign University-Willard
Flights to Kagoshima
Flights to Ohrid
Flights to Clermont-Ferrand Aulnat
Flights to Parikia Paros

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 Denver to Nantucket?

Cheapflights makes it easy to find Denver to Nantucket flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Denver to Nantucket?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Denver to Nantucket.

Can Cheapflights find flights from Denver to Nantucket with no change fees?

Yes! Cheapflights helps users easily find flights from Denver to Nantucket with no change fees.

Can Cheapflights notify me if prices for flights from Denver to Nantucket become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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