United Airlines
flight
UA 3991:
Multiple routes
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FLIGHT SCHEDULE
Direct Flights:
United Airlines UA3991
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:51, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Effective 2026-01-08 through 2026-01-16
Mon
Tue
Wed
-
-
Thu
Fri
Sat
-
-
Sun
Duration: 1:29, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Effective 2026-01-19 through 2026-02-10
Mon
Tue
Wed
-
-
Thu
Fri
Sat
-
-
Sun
Duration: 1:29, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Effective 2026-02-12 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
-
Duration: 1:32, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Effective 2026-02-15 through 2026-03-01
Mon
-
-
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
Duration: 1:30, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:19, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:31, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Effective 2026-01-10 through 2026-02-07
Mon
-
-
Tue
-
-
Wed
-
-
Thu
-
-
Fri
-
-
Sat
Sun
-
-
Duration: 2:24, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Operates only on 2026-02-11
Mon
-
-
Tue
-
-
Wed
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Duration: 2:24, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:53, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
Direct Flights:
United Airlines UA3991
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:05, non-stop
Embraer EMB 175 (E7W)
Embraer EMB 175 (E7W)
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This flight number is listed as serving the following routes:
- Atlanta (ATL) - Washington Dulles (IAD)
- Birmingham (BHM) - Houston George Bush (IAH)
- Buffalo (BUF) - Washington Dulles (IAD)
- Cleveland (CLE) - Washington Dulles (IAD)
- Hartford (BDL) - Washington Dulles (IAD)
- Hayden (HDN) - Houston George Bush (IAH)
- Houston George Bush (IAH) - Omaha (OMA)