Flights from Zurich (ZRH) to Chicago (CHI) with Star Alliance

Start your journey with just one click

Airline

1/15

Zurich

toChicago

ZRH-ORD

September 2, 2024

April 11, 2025

Sold byUnited Airlines

From

503USD Price subject to changes

Viewed:47 minutes ago

Roundtrip

Economy

2/15

Zurich

toChicago

ZRH-ORD

September 2, 2024

April 11, 2025

Sold byUnited Airlines

From

636USD Price subject to changes

Viewed:47 minutes ago

Roundtrip

Economy

3/15

Zurich

toChicago

ZRH-ORD

August 5, 2024

August 11, 2024

Sold byUnited Airlines

From

674CHF Price subject to changes

Viewed:an hour ago

Roundtrip

Economy

4/15

Zurich

toChicago

ZRH-ORD

May 25, 2024

June 1, 2024

Sold byUnited Airlines

From

747CHF Price subject to changes

Viewed:58 minutes ago

Roundtrip

Economy

*Prices have been offered for round trips within the last 48 hours and might not be currently available. Not all Star Alliance Member Airlines or all fares/options are shown. Additional baggage fees, payment fees and fees for other optional services may apply. When booking, please check for restrictions on refunds, rebooking and baggage allowance that may apply. Prices may vary depending on the route and flights selected. Routings may include stopovers. Terms and conditions apply.

Weather in Chicago

Saturday

sky is clear

18/05/2024

25°C

18/05/2024

sky is clear

Sunday

moderate rain

19/05/2024

20°C

19/05/2024

moderate rain

Monday

light rain

20/05/2024

27°C

20/05/2024

light rain

Tuesday

moderate rain

21/05/2024

27°C

21/05/2024

moderate rain

Wednesday

light rain

22/05/2024

20°C

22/05/2024

light rain

Thursday

sky is clear

23/05/2024

22°C

23/05/2024

sky is clear

Friday

light rain

24/05/2024

24°C

24/05/2024

light rain

Flight schedules from Zurich to Chicago with Star Alliance member carriers

Please note that the flight schedules of our member carriers are subject to change on short notice. We recommend using our member airlines information page. for the latest flight updates, details on booking flexibility, as well as specific Frequent Flyer Program information.

Outbound (33)

Sort by

Zurich CH
ZRH09:25
9h 45m
No stops
Chicago US
ORD12:10
Zurich - Chicago
Swiss
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 6
  Zurich. CH
  ZRH 09:25
  9h 45m
  4455 Miles
  Chicago. US
  ORD 12:10
  Airbus A330-300 Passenger
  Operated by Swiss
Zurich CH
ZRH09:50
9h 55m
No stops
Chicago US
ORD12:45
Zurich - Chicago
United Airlines
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1United Airlines UA 12
  Zurich. CH
  ZRH 09:50
  9h 55m
  4455 Miles
  Chicago. US
  ORD 12:45
  Boeing 767-300 Passenger
  Operated by United Airlines
Zurich CH
ZRH13:10
9h 55m
No stops
Chicago US
ORD16:05
Zurich - Chicago
Swiss
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 8
  Zurich. CH
  ZRH 13:10
  9h 55m
  4455 Miles
  Chicago. US
  ORD 16:05
  Boeing 777-300ER Passenger
  Operated by Swiss
Zurich CH
ZRH07:25
11h 35m
1 Stop
Chicago US
ORD12:00
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 786
  Zurich. CH
  ZRH 07:25
  1h 25m
  301 Miles
  Brussels. BE
  BRU 08:50
  Airbus A220-300 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 973
  Brussels. BE
  BRU 10:15
  8h 45m
  4171 Miles
  Chicago. US
  ORD 12:00
  Boeing 787-10
  Operated by United Airlines
Zurich CH
ZRH09:20
11h 35m
1 Stop
Chicago US
ORD13:55
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Lufthansa LH 2367
  Zurich. CH
  ZRH 09:20
  0h 55m
  162 Miles
  Munich. DE
  MUC 10:15
  Canadair (Bombardier) Regional Jet 900 and Challenger 890
  Operated by Lufthansa
2. Flight 2United Airlines UA 952
  Munich. DE
  MUC 11:30
  9h 25m
  4542 Miles
  Chicago. US
  ORD 13:55
  Boeing 787-10
  Operated by United Airlines
Zurich CH
ZRH08:15
11h 40m
1 Stop
Chicago US
ORD12:55
Zurich - Chicago
Lufthansa
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Lufthansa LH 1183
  Zurich. CH
  ZRH 08:15
  1h 0m
  178 Miles
  Frankfurt. DE
  FRA 09:15
  Airbus A320 Passenger
  Operated by Lufthansa
2. Flight 2Lufthansa LH 430
  Frankfurt. DE
  FRA 10:50
  9h 5m
  4355 Miles
  Chicago. US
  ORD 12:55
  Boeing 747-8 Passenger
  Operated by Lufthansa
Zurich CH
ZRH13:15
12h 0m
1 Stop
Chicago US
ORD18:15
Zurich - Chicago
Lufthansa
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Lufthansa LH 2369
  Zurich. CH
  ZRH 13:15
  0h 55m
  162 Miles
  Munich. DE
  MUC 14:10
  Canadair (Bombardier) Regional Jet 900 and Challenger 890
  Operated by Lufthansa
2. Flight 2Lufthansa LH 434
  Munich. DE
  MUC 15:50
  9h 25m
  4542 Miles
  Chicago. US
  ORD 18:15
  Airbus A350-900
  Operated by Lufthansa
Zurich CH
ZRH07:15
12h 0m
1 Stop
Chicago US
ORD12:15
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 1100
  Zurich. CH
  ZRH 07:15
  1h 0m
  162 Miles
  Munich. DE
  MUC 08:15
  Embraer 195 E2
  Operated by Swiss
2. Flight 2Lufthansa LH 436
  Munich. DE
  MUC 09:50
  9h 25m
  4542 Miles
  Chicago. US
  ORD 12:15
  Airbus A350-900
  Operated by Lufthansa
Zurich CH
ZRH14:40
12h 15m
1 Stop
Chicago US
ORD19:55
Zurich - Chicago
Lufthansa
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Lufthansa LH 1191
  Zurich. CH
  ZRH 14:40
  1h 0m
  178 Miles
  Frankfurt. DE
  FRA 15:40
  Airbus A320 Passenger (sharklets)
  Operated by Lufthansa
2. Flight 2Lufthansa LH 432
  Frankfurt. DE
  FRA 17:20
  9h 35m
  4355 Miles
  Chicago. US
  ORD 19:55
  Airbus A340-300
  Operated by Lufthansa
Zurich CH
ZRH12:35
12h 20m
1 Stop
Chicago US
ORD17:55
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 1270
  Zurich. CH
  ZRH 12:35
  1h 45m
  593 Miles
  Copenhagen. DK
  CPH 14:20
  Airbus A220-300 Passenger
  Operated by Swiss
2. Flight 2SAS SK 943
  Copenhagen. DK
  CPH 15:45
  9h 10m
  4282 Miles
  Chicago. US
  ORD 17:55
  Airbus A330-300 Passenger
  Operated by SAS
Zurich CH
ZRH07:20
12h 20m
1 Stop
Chicago US
ORD12:40
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 724
  Zurich. CH
  ZRH 07:20
  1h 40m
  376 Miles
  Amsterdam. NL
  AMS 09:00
  Embraer 195 E2
  Operated by Swiss
2. Flight 2United Airlines UA 908
  Amsterdam. NL
  AMS 10:55
  8h 45m
  4131 Miles
  Chicago. US
  ORD 12:40
  Boeing 787-8
  Operated by United Airlines
Zurich CH
ZRH09:30
12h 20m
1 Stop
Chicago US
ORD14:50
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Lufthansa LH 1185
  Zurich. CH
  ZRH 09:30
  1h 0m
  178 Miles
  Frankfurt. DE
  FRA 10:30
  Airbus A320 Passenger
  Operated by Lufthansa
2. Flight 2United Airlines UA 906
  Frankfurt. DE
  FRA 12:45
  9h 5m
  4355 Miles
  Chicago. US
  ORD 14:50
  Boeing 787-10
  Operated by United Airlines
Zurich CH
ZRH10:30
12h 40m
1 Stop
Chicago US
ORD16:10
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 318
  Zurich. CH
  ZRH 10:30
  1h 55m
  492 Miles
  London. GB
  LHR 11:25
  Airbus A220-300 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 928
  London. GB
  LHR 13:05
  9h 5m
  3964 Miles
  Chicago. US
  ORD 16:10
  Boeing 767-300 Passenger
  Operated by United Airlines
Zurich CH
ZRH07:25
12h 50m
1 Stop
Chicago US
ORD13:15
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 632
  Zurich. CH
  ZRH 07:25
  1h 30m
  297 Miles
  Paris. FR
  CDG 08:55
  Airbus A220-100 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 986
  Paris. FR
  CDG 11:15
  9h 0m
  4164 Miles
  Chicago. US
  ORD 13:15
  Boeing 787-10
  Operated by United Airlines
Zurich CH
ZRH07:00
12h 55m
1 Stop
Chicago US
ORD12:55
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 1068
  Zurich. CH
  ZRH 07:00
  1h 5m
  178 Miles
  Frankfurt. DE
  FRA 08:05
  Airbus A220-300 Passenger
  Operated by Swiss
2. Flight 2Lufthansa LH 430
  Frankfurt. DE
  FRA 10:50
  9h 5m
  4355 Miles
  Chicago. US
  ORD 12:55
  Boeing 747-8 Passenger
  Operated by Lufthansa
Zurich CH
ZRH12:40
12h 56m
1 Stop
Chicago US
ORD18:36
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 86
  Zurich. CH
  ZRH 12:40
  8h 20m
  3746 Miles
  Montreal. CA
  YUL 15:00
  Airbus A330-300 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 3629
  Montreal. CA
  YUL 16:50
  2h 46m
  750 Miles
  Chicago. US
  ORD 18:36
  Embraer 175 (Enhanced Winglets)
  Operated by United Airlines
Zurich CH
ZRH07:10
13h 10m
1 Stop
Chicago US
ORD13:20
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 1574
  Zurich. CH
  ZRH 07:10
  1h 20m
  376 Miles
  Vienna. AT
  VIE 08:30
  Airbus A220-300 Passenger
  Operated by Swiss
2. Flight 2Austrian OS 65
  Vienna. AT
  VIE 10:30
  9h 50m
  4728 Miles
  Chicago. US
  ORD 13:20
  Boeing 777-200 / 200ER Passenger
  Operated by Austrian
Zurich CH
ZRH12:05
13h 20m
1 Stop
Chicago US
ORD18:25
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 332
  Zurich. CH
  ZRH 12:05
  1h 55m
  492 Miles
  London. GB
  LHR 13:00
  Airbus A220-100 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 959
  London. GB
  LHR 15:20
  9h 5m
  3964 Miles
  Chicago. US
  ORD 18:25
  Boeing 767-300 Passenger
  Operated by United Airlines
Zurich CH
ZRH08:15
13h 35m
1 Stop
Chicago US
ORD14:50
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Lufthansa LH 1183
  Zurich. CH
  ZRH 08:15
  1h 0m
  178 Miles
  Frankfurt. DE
  FRA 09:15
  Airbus A320 Passenger
  Operated by Lufthansa
2. Flight 2United Airlines UA 906
  Frankfurt. DE
  FRA 12:45
  9h 5m
  4355 Miles
  Chicago. US
  ORD 14:50
  Boeing 787-10
  Operated by United Airlines
Zurich CH
ZRH07:15
13h 40m
1 Stop
Chicago US
ORD13:55
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 1100
  Zurich. CH
  ZRH 07:15
  1h 0m
  162 Miles
  Munich. DE
  MUC 08:15
  Embraer 195 E2
  Operated by Swiss
2. Flight 2United Airlines UA 952
  Munich. DE
  MUC 11:30
  9h 25m
  4542 Miles
  Chicago. US
  ORD 13:55
  Boeing 787-10
  Operated by United Airlines
Zurich CH
ZRH10:10
13h 45m
1 Stop
Chicago US
ORD16:55
Zurich - Chicago
United Airlines
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1United Airlines UA 135
  Zurich. CH
  ZRH 10:10
  9h 5m
  3956 Miles
  New York. US
  EWR 13:15
  Boeing 767-300 Passenger
  Operated by United Airlines
2. Flight 2United Airlines UA 1504
  New York. US
  EWR 15:20
  2h 35m
  721 Miles
  Chicago. US
  ORD 16:55
  Boeing 757-200 Passenger
  Operated by United Airlines
Zurich CH
ZRH11:55
13h 54m
1 Stop
Chicago US
ORD18:49
Zurich - Chicago
United Airlines
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1United Airlines UA 53
  Zurich. CH
  ZRH 11:55
  9h 20m
  4169 Miles
  Washington. US
  IAD 15:15
  Boeing 767-400 Passenger
  Operated by United Airlines
2. Flight 2United Airlines UA 2497
  Washington. US
  IAD 17:35
  2h 14m
  590 Miles
  Chicago. US
  ORD 18:49
  Boeing 757-200 Passenger
  Operated by United Airlines
Zurich CH
ZRH12:50
14h 5m
1 Stop
Chicago US
ORD19:55
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 1072
  Zurich. CH
  ZRH 12:50
  1h 5m
  178 Miles
  Frankfurt. DE
  FRA 13:55
  Embraer 190
  Operated by Swiss
2. Flight 2Lufthansa LH 432
  Frankfurt. DE
  FRA 17:20
  9h 35m
  4355 Miles
  Chicago. US
  ORD 19:55
  Airbus A340-300
  Operated by Lufthansa
Zurich CH
ZRH10:00
14h 10m
1 Stop
Chicago US
ORD17:10
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 16
  Zurich. CH
  ZRH 10:00
  8h 45m
  3942 Miles
  New York. US
  JFK 12:45
  Airbus A330-300 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 2075
  New York. US
  LGA 15:30
  2h 40m
  735 Miles
  Chicago. US
  ORD 17:10
  Boeing 737-700 Passenger
  Operated by United Airlines
Zurich CH
ZRH13:25
14h 19m
1 Stop
Chicago US
ORD20:44
Zurich - Chicago
Air Canada
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Air Canada AC 881
  Zurich. CH
  ZRH 13:25
  9h 15m
  4055 Miles
  Toronto. CA
  YYZ 16:40
  Airbus A330-300 Passenger
  Operated by Air Canada
2. Flight 2Air Canada AC 511
  Toronto. CA
  YYZ 19:50
  1h 54m
  437 Miles
  Chicago. US
  ORD 20:44
  Airbus A220-300 Passenger
  Operated by Air Canada
Zurich CH
ZRH11:00
14h 25m
1 Stop
Chicago US
ORD18:25
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 456
  Zurich. CH
  ZRH 11:00
  1h 40m
  474 Miles
  London. GB
  LCY 11:40
  Airbus A220-100 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 959
  London. GB
  LHR 15:20
  9h 5m
  3964 Miles
  Chicago. US
  ORD 18:25
  Boeing 767-300 Passenger
  Operated by United Airlines
Zurich CH
ZRH12:10
14h 30m
1 Stop
Chicago US
ORD19:40
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 1348
  Zurich. CH
  ZRH 12:10
  1h 55m
  644 Miles
  Warsaw. PL
  WAW 14:05
  Embraer 190
  Operated by Swiss
2. Flight 2LOT Polish Airlines LO 3
  Warsaw. PL
  WAW 16:40
  10h 0m
  4698 Miles
  Chicago. US
  ORD 19:40
  Boeing 787-9
  Operated by LOT Polish Airlines
Zurich CH
ZRH12:40
14h 36m
1 Stop
Chicago US
ORD20:16
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 86
  Zurich. CH
  ZRH 12:40
  8h 20m
  3746 Miles
  Montreal. CA
  YUL 15:00
  Airbus A330-300 Passenger
  Operated by Swiss
2. Flight 2Air Canada AC 8967
  Montreal. CA
  YUL 18:40
  2h 36m
  750 Miles
  Chicago. US
  ORD 20:16
  Embraer 175
  Operated by Air Canada
Zurich CH
ZRH10:10
14h 53m
1 Stop
Chicago US
ORD18:03
Zurich - Chicago
United Airlines
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1United Airlines UA 135
  Zurich. CH
  ZRH 10:10
  9h 5m
  3956 Miles
  New York. US
  EWR 13:15
  Boeing 767-300 Passenger
  Operated by United Airlines
2. Flight 2United Airlines UA 1286
  New York. US
  EWR 16:25
  2h 38m
  721 Miles
  Chicago. US
  ORD 18:03
  Boeing 737-700 Passenger
  Operated by United Airlines
Zurich CH
ZRH10:30
14h 55m
1 Stop
Chicago US
ORD18:25
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 318
  Zurich. CH
  ZRH 10:30
  1h 55m
  492 Miles
  London. GB
  LHR 11:25
  Airbus A220-300 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 959
  London. GB
  LHR 15:20
  9h 5m
  3964 Miles
  Chicago. US
  ORD 18:25
  Boeing 767-300 Passenger
  Operated by United Airlines
Zurich CH
ZRH10:00
15h 3m
1 Stop
Chicago US
ORD18:03
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 16
  Zurich. CH
  ZRH 10:00
  8h 45m
  3942 Miles
  New York. US
  JFK 12:45
  Airbus A330-300 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 1286
  New York. US
  EWR 16:25
  2h 38m
  721 Miles
  Chicago. US
  ORD 18:03
  Boeing 737-700 Passenger
  Operated by United Airlines
Zurich CH
ZRH10:00
15h 10m
1 Stop
Chicago US
ORD18:10
Zurich - Chicago
Star Alliance
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Swiss LX 16
  Zurich. CH
  ZRH 10:00
  8h 45m
  3942 Miles
  New York. US
  JFK 12:45
  Airbus A330-300 Passenger
  Operated by Swiss
2. Flight 2United Airlines UA 2224
  New York. US
  LGA 16:30
  2h 40m
  735 Miles
  Chicago. US
  ORD 18:10
  Boeing 737-800 Passenger
  Operated by United Airlines
Zurich CH
ZRH07:35
17h 10m
1 Stop
Chicago US
ORD17:45
Zurich - Chicago
Turkish Airlines
Flight Operates
1. Mon
2. Tue
3. Wed
4. Thu
5. Fri
6. Sat
7. Sun
1. Flight 1Turkish Airlines TK 1912
  Zurich. CH
  ZRH 07:35
  3h 5m
  1087 Miles
  Istanbul. TR
  IST 11:40
  Boeing 737 MAX 8 Passenger / BBJ MAX 8 / Boeing 737 MAX 200
  Operated by Turkish Airlines
2. Flight 2Turkish Airlines TK 5
  Istanbul. TR
  IST 14:20
  11h 25m
  5490 Miles
  Chicago. US
  ORD 17:45
  Boeing 777-300ER Passenger
  Operated by Turkish Airlines