United Airlines flight UA 3990: Multiple routes

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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 08:35 Houston George Bush (IAH) B 12:01 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:26 Effective 2026-04-30 through 2026-05-20
Mon-Wed,Fri-Sun 08:48 Houston George Bush (IAH) B 12:06 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:18 Valid until 2026-01-05
Mon-Fri,Sun 10:00 Houston George Bush (IAH) B 13:14 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:14 Effective 2026-01-06 through 2026-01-16
Mon-Fri,Sun 10:00 Houston George Bush (IAH) B 13:14 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:14 Effective 2026-01-19 through 2026-02-03
Mon-Fri,Sun 10:00 Houston George Bush (IAH) B 13:14 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:14 Effective 2026-02-05 through 2026-02-11
Daily 10:08 Houston George Bush (IAH) B 13:33 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:25 Effective from 2026-05-21
Mon-Fri,Sun 10:10 Houston George Bush (IAH) B 13:31 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:21 Effective 2026-02-12 through 2026-03-04
Mon-Fri,Sun 10:10 Houston George Bush (IAH) B 13:32 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:22 Effective 2026-03-05 through 2026-03-27
Daily 10:10 Houston George Bush (IAH) B 13:36 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:26 Effective 2026-03-29 through 2026-04-29
Sat 11:43 Atlanta (ATL) N 13:22 Houston George Bush (IAH) B
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:39 Effective 2026-03-07 through 2026-03-28
Sat 11:55 Houston George Bush (IAH) B 15:11 Louisville (SDF)
UA 3990 Non-stop Embraer EMB 175 (E7W) 2:16 Effective 2026-02-14 through 2026-02-28
Sat 12:10 Austin (AUS) 16:30 Washington Dulles (IAD)
UA 3990 Non-stop Embraer EMB 175 (E7W) 3:20 Effective 2026-01-10 through 2026-02-07
Sun 14:58 Cincinnati (CVG) 16:30 Washington Dulles (IAD)
UA 3990 Non-stop Embraer EMB 175 (E7W) 1:32 Operates only on 2026-01-18
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This flight number is listed as serving the following routes:


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United Airlines flight UA 3990: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA3990
08:35
Houston George Bush (IAH) B

12:01
Louisville (SDF)
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:26, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
08:48
Houston George Bush (IAH) B

12:06
Louisville (SDF)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
-
Fri
Sat
Sun
Duration: 2:18, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
10:00
Houston George Bush (IAH) B

13:14
Louisville (SDF)
Effective 2026-01-06 through 2026-01-16
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:14, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
10:00
Houston George Bush (IAH) B

13:14
Louisville (SDF)
Effective 2026-01-19 through 2026-02-03
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:14, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
10:00
Houston George Bush (IAH) B

13:14
Louisville (SDF)
Effective 2026-02-05 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:14, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
10:08
Houston George Bush (IAH) B

13:33
Louisville (SDF)
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:25, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
10:10
Houston George Bush (IAH) B

13:31
Louisville (SDF)
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:21, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
10:10
Houston George Bush (IAH) B

13:32
Louisville (SDF)
Effective 2026-03-05 through 2026-03-27
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:22, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
10:10
Houston George Bush (IAH) B

13:36
Louisville (SDF)
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:26, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
11:43
Atlanta (ATL) N

13:22
Houston George Bush (IAH) B
Effective 2026-03-07 through 2026-03-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:39, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
11:55
Houston George Bush (IAH) B

15:11
Louisville (SDF)
Effective 2026-02-14 through 2026-02-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:16, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
12:10
Austin (AUS)

16:30
Washington Dulles (IAD)
Effective 2026-01-10 through 2026-02-07
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 3:20, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3990
14:58
Cincinnati (CVG)

16:30
Washington Dulles (IAD)
Operates only on 2026-01-18
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Duration: 1:32, non-stop
Embraer EMB 175 (E7W)
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This flight number is listed as serving the following routes:
  • Atlanta (ATL) - Houston George Bush (IAH)
  • Austin (AUS) - Washington Dulles (IAD)
  • Cincinnati (CVG) - Washington Dulles (IAD)
  • Houston George Bush (IAH) - Louisville (SDF)
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