United Airlines flight UA 3661: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 07:25 Chicago O'Hare (ORD) 2 10:39 Ottawa Macdonald-Cartier (YOW)
UA 3661 Non-stop Embraer EMB 175 (E7W) 2:14 Effective from 2026-10-25
Daily 10:53 Chicago O'Hare (ORD) 2 13:45 Ottawa Macdonald-Cartier (YOW)
UA 3661 Non-stop Embraer EMB 175 (E7W) 1:52 Effective 2026-03-29 through 2026-04-29
Daily 10:53 Chicago O'Hare (ORD) 2 14:09 Ottawa Macdonald-Cartier (YOW)
UA 3661 Non-stop Embraer EMB 175 (E7W) 2:16 Effective 2026-04-30 through 2026-05-20
Daily 10:53 Chicago O'Hare (ORD) 2 13:45 Ottawa Macdonald-Cartier (YOW)
UA 3661 Non-stop Embraer EMB 175 (E7W) 1:52 Effective 2026-05-21 through 2026-10-24
Sat 11:30 Omaha (OMA) 13:12 Chicago O'Hare (ORD) 2
UA 3661 Non-stop Embraer EMB 175 (E7W) 1:42 Effective 2026-03-07 through 2026-03-28
Daily 12:35 Chicago O'Hare (ORD) 2 14:27 Sioux Falls (FSD)
UA 3661 Non-stop Embraer EMB 175 (E7W) 1:52 Valid until 2026-01-05
Mon-Fri,Sun 15:00 Chicago O'Hare (ORD) 2 18:23 New York LaGuardia (LGA) B
UA 3661 Non-stop Embraer EMB 175 (E7W) 2:23 Effective 2026-01-06 through 2026-02-11
Mon-Sat 15:00 Chicago O'Hare (ORD) 2 18:27 New York LaGuardia (LGA) B
UA 3661 Non-stop Embraer EMB 175 (E7W) 2:27 Effective 2026-02-12 through 2026-03-06
Mon-Fri,Sun 15:00 Chicago O'Hare (ORD) 2 18:27 New York LaGuardia (LGA) B
UA 3661 Non-stop Embraer EMB 175 (E7W) 2:27 Effective 2026-03-08 through 2026-03-27
Sun 15:05 Newark Liberty, New York (EWR) C 16:30 Washington Dulles (IAD)
UA 3661 Non-stop Embraer EMB 175 (E7W) 1:25 Effective 2026-02-15 through 2026-03-01
Sat 20:07 Pittsburgh (PIT) 21:25 Washington Dulles (IAD)
UA 3661 Non-stop Embraer EMB 175 (E7W) 1:18 Effective 2026-01-10 through 2026-02-07
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This flight number is listed as serving the following routes:


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United Airlines flight UA 3661: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA3661
07:25
Chicago O'Hare (ORD) 2

10:39
Ottawa Macdonald-Cartier (YOW)
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:14, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
10:53
Chicago O'Hare (ORD) 2

13:45
Ottawa Macdonald-Cartier (YOW)
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:52, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
10:53
Chicago O'Hare (ORD) 2

14:09
Ottawa Macdonald-Cartier (YOW)
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:16, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
10:53
Chicago O'Hare (ORD) 2

13:45
Ottawa Macdonald-Cartier (YOW)
Effective 2026-05-21 through 2026-10-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:52, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
11:30
Omaha (OMA)

13:12
Chicago O'Hare (ORD) 2
Effective 2026-03-07 through 2026-03-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:42, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
12:35
Chicago O'Hare (ORD) 2

14:27
Sioux Falls (FSD)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:52, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
15:00
Chicago O'Hare (ORD) 2

18:23
New York LaGuardia (LGA) B
Effective 2026-01-06 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:23, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
15:00
Chicago O'Hare (ORD) 2

18:27
New York LaGuardia (LGA) B
Effective 2026-02-12 through 2026-03-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
Duration: 2:27, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
15:00
Chicago O'Hare (ORD) 2

18:27
New York LaGuardia (LGA) B
Effective 2026-03-08 through 2026-03-27
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:27, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
15:05
Newark Liberty, New York (EWR) C

16:30
Washington Dulles (IAD)
Effective 2026-02-15 through 2026-03-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:25, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3661
20:07
Pittsburgh (PIT)

21:25
Washington Dulles (IAD)
Effective 2026-01-10 through 2026-02-07
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:18, non-stop
Embraer EMB 175 (E7W)
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This flight number is listed as serving the following routes:
  • Chicago O'Hare (ORD) - New York LaGuardia (LGA)
  • Chicago O'Hare (ORD) - Ottawa Macdonald-Cartier (YOW)
  • Chicago O'Hare (ORD) - Sioux Falls (FSD)
  • Newark Liberty, New York (EWR) - Washington Dulles (IAD)
  • Omaha (OMA) - Chicago O'Hare (ORD)
  • Pittsburgh (PIT) - Washington Dulles (IAD)
All United Airlines flights
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