American Airlines flight AA 4321: Chicago O'Hare - Waterloo

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FLIGHT SCHEDULE
Direct Flights:
Daily 20:20 Chicago O'Hare (ORD) 3 21:42 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:22 Effective 2026-04-07 through 2026-05-20
Sat 21:00 Chicago O'Hare (ORD) 3 22:12 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:12 Operates only on 2026-02-14
Sun 21:05 Chicago O'Hare (ORD) 3 22:17 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:12 Operates only on 2026-02-15
Daily 21:07 Chicago O'Hare (ORD) 3 22:23 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:16 Effective 2026-01-06 through 2026-01-16
Daily 21:07 Chicago O'Hare (ORD) 3 22:23 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:16 Effective 2026-01-18 through 2026-02-11
Tue,Wed 21:07 Chicago O'Hare (ORD) 3 22:19 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:12 Effective 2026-02-17 through 2026-03-04
Daily 22:00 Chicago O'Hare (ORD) 3 23:19 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:19 Effective 2026-05-21 through 2026-07-01
Daily 22:00 Chicago O'Hare (ORD) 3 23:18 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:18 Effective 2026-07-02 through 2026-08-04
Daily 22:00 Chicago O'Hare (ORD) 3 23:16 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:16 Effective 2026-09-09 through 2026-10-04
Daily 22:00 Chicago O'Hare (ORD) 3 23:19 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:19 Effective from 2026-10-05
Daily 22:15 Chicago O'Hare (ORD) 3 23:32 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:17 Effective 2026-08-05 through 2026-09-08
Mon,Tue,Thu-Sun 22:27 Chicago O'Hare (ORD) 3 23:45 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:18 Valid until 2026-01-05
Mon,Thu,Fri 22:34 Chicago O'Hare (ORD) 3 23:47 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:13 Effective 2026-02-12 through 2026-02-20
Mon,Thu-Sun 22:34 Chicago O'Hare (ORD) 3 23:47 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:13 Effective 2026-02-21 through 2026-03-07
Daily 22:34 Chicago O'Hare (ORD) 3 23:53 Waterloo (ALO)
AA 4321 Non-stop Embraer EMB 170 / EMB 175 (E70) 1:19 Effective 2026-03-08 through 2026-04-06
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American Airlines flight AA 4321:
Chicago O'Hare - Waterloo
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
American Airlines AA4321
20:20
Chicago O'Hare (ORD) 3

21:42
Waterloo (ALO)
Effective 2026-04-07 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:22, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
21:00
Chicago O'Hare (ORD) 3

22:12
Waterloo (ALO)
Operates only on 2026-02-14
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:12, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
21:05
Chicago O'Hare (ORD) 3

22:17
Waterloo (ALO)
Operates only on 2026-02-15
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:12, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
21:07
Chicago O'Hare (ORD) 3

22:23
Waterloo (ALO)
Effective 2026-01-06 through 2026-01-16
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:16, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
21:07
Chicago O'Hare (ORD) 3

22:23
Waterloo (ALO)
Effective 2026-01-18 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:16, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
21:07
Chicago O'Hare (ORD) 3

22:19
Waterloo (ALO)
Effective 2026-02-17 through 2026-03-04
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:12, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
22:00
Chicago O'Hare (ORD) 3

23:19
Waterloo (ALO)
Effective 2026-05-21 through 2026-07-01
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:19, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
22:00
Chicago O'Hare (ORD) 3

23:18
Waterloo (ALO)
Effective 2026-07-02 through 2026-08-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:18, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
22:00
Chicago O'Hare (ORD) 3

23:16
Waterloo (ALO)
Effective 2026-09-09 through 2026-10-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:16, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
22:00
Chicago O'Hare (ORD) 3

23:19
Waterloo (ALO)
Effective from 2026-10-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:19, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
22:15
Chicago O'Hare (ORD) 3

23:32
Waterloo (ALO)
Effective 2026-08-05 through 2026-09-08
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:17, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
22:27
Chicago O'Hare (ORD) 3

23:45
Waterloo (ALO)
Valid until 2026-01-05
Mon
Tue
Wed
-
Thu
Fri
Sat
Sun
Duration: 1:18, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
22:34
Chicago O'Hare (ORD) 3

23:47
Waterloo (ALO)
Effective 2026-02-12 through 2026-02-20
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:13, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
22:34
Chicago O'Hare (ORD) 3

23:47
Waterloo (ALO)
Effective 2026-02-21 through 2026-03-07
Mon
Tue
-
Wed
-
Thu
Fri
Sat
Sun
Duration: 1:13, non-stop
Embraer EMB 170 / EMB 175 (E70)
Direct Flights:
American Airlines AA4321
22:34
Chicago O'Hare (ORD) 3

23:53
Waterloo (ALO)
Effective 2026-03-08 through 2026-04-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:19, non-stop
Embraer EMB 170 / EMB 175 (E70)
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  • AA 4321 is a domestic flight departing from the Chicago O'Hare airport (ORD) and arriving at Waterloo airport (ALO).
  • The flight distance is 233 miles, or 375 km.
  • The timezone of both the departure and the arrival airports is UTC-6 . Current time at both airports is (loading...).
  • For direct flights, the flight time varies between 1:12 and 1:22.
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