SEA → ONT from $139 round-trip

Flight deal

SEA → ONT from $139 round-trip

SEA → ONTUSD 139Frontier AirlineseconomyRound-tripGreat · 80/100

Score basis: 57% below the 5-fare median of $323.

Live fare — price verified 33 min ago.

Travel: 2026-09-20 – 2026-09-24
Book by: 8/16/2026
Booked via: Travelpayouts partner feed
Operated by: Frontier Airlines

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Last verified: 8/14/2026, 6:10:02 PM · Source: travelpayouts_api