United Airlines flight UA 3621: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 06:30 Saint Louis (STL) 1 10:02 Newark Liberty, New York (EWR) C
UA 3621 Non-stop Embraer EMB 175 (E7W) 2:32 Effective 2026-03-29 through 2026-04-29
Daily 06:30 Saint Louis (STL) 1 10:04 Newark Liberty, New York (EWR) C
UA 3621 Non-stop Embraer EMB 175 (E7W) 2:34 Effective 2026-04-30 through 2026-05-20
Daily 06:30 Saint Louis (STL) 1 10:02 Newark Liberty, New York (EWR) C
UA 3621 Non-stop Embraer EMB 175 (E7W) 2:32 Effective from 2026-06-25
Mon,Thu,Fri,Sun 09:00 Detroit (DTW) E 10:58 Newark Liberty, New York (EWR) C
UA 3621 Non-stop Embraer EMB 175 (E7W) 1:58 Effective 2026-01-08 through 2026-02-09
Daily 11:25 Newark Liberty, New York (EWR) C 13:09 Montreal-Trudeau (YUL)
UA 3621 Non-stop Embraer EMB 175 (E7W) 1:44 Effective 2026-03-29 through 2026-04-29
Daily 11:30 Newark Liberty, New York (EWR) C 13:10 Montreal-Trudeau (YUL)
UA 3621 Non-stop Embraer EMB 175 (E7W) 1:40 Effective from 2026-04-30
Daily 11:53 Newark Liberty, New York (EWR) C 13:28 Montreal-Trudeau (YUL)
UA 3621 Non-stop Embraer EMB 175 (E7W) 1:35 Valid until 2026-02-03
Daily 11:53 Newark Liberty, New York (EWR) C 13:28 Montreal-Trudeau (YUL)
UA 3621 Non-stop Embraer EMB 175 (E7W) 1:35 Effective 2026-02-05 through 2026-03-28
Non-Direct Flights:
Daily 06:30 Saint Louis (STL) 1 13:09 Montreal-Trudeau (YUL)
UA 3621 1-stop Embraer EMB 175 (E7W) 5:39 Effective 2026-03-29 through 2026-04-29
Daily 06:30 Saint Louis (STL) 1 13:10 Montreal-Trudeau (YUL)
UA 3621 1-stop Embraer EMB 175 (E7W) 5:40 Effective 2026-04-30 through 2026-05-20
Daily 06:30 Saint Louis (STL) 1 13:10 Montreal-Trudeau (YUL)
UA 3621 1-stop Embraer EMB 175 (E7W) 5:40 Effective from 2026-06-25
Mon,Thu,Fri,Sun 09:00 Detroit (DTW) E 13:28 Montreal-Trudeau (YUL)
UA 3621 1-stop Embraer EMB 175 (E7W) 4:28 Effective 2026-01-08 through 2026-02-09
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This flight number is listed as serving the following routes:


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United Airlines flight UA 3621: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA3621
06:30
Saint Louis (STL) 1

10:02
Newark Liberty, New York (EWR) C
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:32, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3621
06:30
Saint Louis (STL) 1

10:04
Newark Liberty, New York (EWR) C
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:34, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3621
06:30
Saint Louis (STL) 1

10:02
Newark Liberty, New York (EWR) C
Effective from 2026-06-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:32, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3621
09:00
Detroit (DTW) E

10:58
Newark Liberty, New York (EWR) C
Effective 2026-01-08 through 2026-02-09
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 1:58, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3621
11:25
Newark Liberty, New York (EWR) C

13:09
Montreal-Trudeau (YUL)
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:44, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3621
11:30
Newark Liberty, New York (EWR) C

13:10
Montreal-Trudeau (YUL)
Effective from 2026-04-30
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:40, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3621
11:53
Newark Liberty, New York (EWR) C

13:28
Montreal-Trudeau (YUL)
Valid until 2026-02-03
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:35, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3621
11:53
Newark Liberty, New York (EWR) C

13:28
Montreal-Trudeau (YUL)
Effective 2026-02-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:35, non-stop
Embraer EMB 175 (E7W)
Non-Direct Flights:
United Airlines UA3621
06:30
Saint Louis (STL) 1

13:09
Montreal-Trudeau (YUL)
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:39, 1-stop
Embraer EMB 175 (E7W)
Non-Direct Flights:
United Airlines UA3621
06:30
Saint Louis (STL) 1

13:10
Montreal-Trudeau (YUL)
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:40, 1-stop
Embraer EMB 175 (E7W)
Non-Direct Flights:
United Airlines UA3621
06:30
Saint Louis (STL) 1

13:10
Montreal-Trudeau (YUL)
Effective from 2026-06-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 5:40, 1-stop
Embraer EMB 175 (E7W)
Non-Direct Flights:
United Airlines UA3621
09:00
Detroit (DTW) E

13:28
Montreal-Trudeau (YUL)
Effective 2026-01-08 through 2026-02-09
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 4:28, 1-stop
Embraer EMB 175 (E7W)
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This flight number is listed as serving the following routes:
  • Detroit (DTW) - Montreal-Trudeau (YUL)
  • Detroit (DTW) - Newark Liberty, New York (EWR)
  • Newark Liberty, New York (EWR) - Montreal-Trudeau (YUL)
  • Saint Louis (STL) - Montreal-Trudeau (YUL)
  • Saint Louis (STL) - Newark Liberty, New York (EWR)
All United Airlines flights
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