Allegiant Air
flight
G4 21:
Multiple routes
Ad mobi flat here (320x100px) 6074960173 M FlightWNum Top Flat
FLIGHT SCHEDULE
Direct Flights:
Allegiant Air G421
Effective 2026-07-03 through 2026-07-10
Mon
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Tue
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Wed
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Thu
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Fri
Sat
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Sun
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Duration: 3:01, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
Allegiant Air G421
Operates only on 2026-07-17
Mon
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Tue
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Wed
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Thu
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Fri
Sat
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Sun
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Duration: 3:01, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direct Flights:
Allegiant Air G421
Effective 2026-07-24 through 2026-08-14
Mon
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Tue
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Wed
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Thu
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Fri
Sat
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Sun
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Duration: 3:01, non-stop
Airbus A320 (320)
Airbus A320 (320)
Direct Flights:
Allegiant Air G421
Valid until 2026-01-03
Mon
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Tue
Wed
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Thu
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Fri
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Sat
Sun
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Duration: 2:30, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direct Flights:
Allegiant Air G421
Effective 2026-01-08 through 2026-02-08
Mon
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Tue
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Wed
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Thu
Fri
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Sat
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Sun
Duration: 2:32, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direct Flights:
Allegiant Air G421
Effective 2026-04-02 through 2026-05-14
Mon
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Tue
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Wed
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Thu
Fri
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Sat
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Sun
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Duration: 1:20, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direct Flights:
Allegiant Air G421
Effective 2026-02-12 through 2026-02-22
Mon
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Tue
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Wed
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Thu
Fri
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Sat
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Sun
Duration: 1:14, non-stop
Airbus A319 (319)
Airbus A319 (319)
Direct Flights:
Allegiant Air G421
Operates only on 2026-03-01
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Duration: 1:12, non-stop
Airbus A319 (319)
Airbus A319 (319)
Ad mobi box here (300x250px) 8888825773 M FlightWNum Bottom Box
Parallax here -
This flight number is listed as serving the following routes:
- Las Vegas Harry Reid (LAS) - Kalispell (FCA)
- Las Vegas Harry Reid (LAS) - Springfield (SGF)
- Santa Maria (SMX) - Las Vegas Harry Reid (LAS)