United Airlines flight UA 3999: Multiple routes

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FLIGHT SCHEDULE
Direct Flights:
Tue 14:20 Houston George Bush (IAH) B 15:56 Oklahoma City (OKC)
UA 3999 Non-stop Embraer EMB 175 (E7W) 1:36 Effective 2026-03-10 through 2026-03-24
Daily 14:25 Corpus Christi (CRP) 15:27 Houston George Bush (IAH) B
UA 3999 Non-stop Embraer EMB 175 (E7W) 1:02 Effective 2026-04-30 through 2026-05-20
Daily 15:50 Atlanta (ATL) N 17:25 Houston George Bush (IAH) B
UA 3999 Non-stop Embraer EMB 175 (E7W) 2:35 Valid until 2026-01-05
Mon,Wed-Sun 16:45 Key West (EYW) 18:52 Houston George Bush (IAH) B
UA 3999 Non-stop Embraer EMB 175 (E7W) 3:07 Effective 2026-03-05 through 2026-03-28
Daily 16:45 Key West (EYW) 19:04 Houston George Bush (IAH) B
UA 3999 Non-stop Embraer EMB 175 (E7W) 3:19 Effective 2026-03-29 through 2026-04-29
Daily 17:15 Washington Dulles (IAD) 19:03 Cincinnati (CVG)
UA 3999 Non-stop Embraer EMB 175 (E7W) 1:48 Effective 2026-01-06 through 2026-02-10
Daily 17:15 McAllen/Mission (MFE) 18:28 Houston George Bush (IAH) B
UA 3999 Non-stop Embraer EMB 175 (E7W) 1:13 Effective from 2026-05-21
Mon,Thu,Fri 17:30 McAllen/Mission (MFE) 18:54 Houston George Bush (IAH) B
UA 3999 Non-stop Embraer EMB 175 (E7W) 1:24 Effective 2026-02-12 through 2026-03-02
Tue 17:30 McAllen/Mission (MFE) 18:54 Houston George Bush (IAH) B
UA 3999 Non-stop Embraer EMB 175 (E7W) 1:24 Operates only on 2026-03-03
Wed 20:20 Houston George Bush (IAH) B 21:32 Baton Rouge (BTR)
UA 3999 Non-stop Embraer EMB 175 (E7W) 1:12 Operates only on 2026-02-11
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This flight number is listed as serving the following routes:


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United Airlines flight UA 3999: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA3999
14:20
Houston George Bush (IAH) B

15:56
Oklahoma City (OKC)
Effective 2026-03-10 through 2026-03-24
Mon
-
Tue
Wed
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Thu
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Fri
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Sat
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Sun
-
Duration: 1:36, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3999
14:25
Corpus Christi (CRP)

15:27
Houston George Bush (IAH) B
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:02, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3999
15:50
Atlanta (ATL) N

17:25
Houston George Bush (IAH) B
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:35, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3999
16:45
Key West (EYW)

18:52
Houston George Bush (IAH) B
Effective 2026-03-05 through 2026-03-28
Mon
Tue
-
Wed
Thu
Fri
Sat
Sun
Duration: 3:07, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3999
16:45
Key West (EYW)

19:04
Houston George Bush (IAH) B
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:19, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3999
17:15
Washington Dulles (IAD)

19:03
Cincinnati (CVG)
Effective 2026-01-06 through 2026-02-10
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:48, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3999
17:15
McAllen/Mission (MFE)

18:28
Houston George Bush (IAH) B
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:13, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3999
17:30
McAllen/Mission (MFE)

18:54
Houston George Bush (IAH) B
Effective 2026-02-12 through 2026-03-02
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
-
Duration: 1:24, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3999
17:30
McAllen/Mission (MFE)

18:54
Houston George Bush (IAH) B
Operates only on 2026-03-03
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:24, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3999
20:20
Houston George Bush (IAH) B

21:32
Baton Rouge (BTR)
Operates only on 2026-02-11
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 1:12, 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)
  • Corpus Christi (CRP) - Houston George Bush (IAH)
  • Houston George Bush (IAH) - Baton Rouge (BTR)
  • Houston George Bush (IAH) - Oklahoma City (OKC)
  • Key West (EYW) - Houston George Bush (IAH)
  • McAllen/Mission (MFE) - Houston George Bush (IAH)
  • Washington Dulles (IAD) - Cincinnati (CVG)
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