SEA → ONT from $125 round-trip

Flight deal

SEA → ONT from $125 round-trip

SEA → ONTUSD 125Frontier AirlineseconomyRound-tripFair · 59/100

Score basis: 42% below the 14-fare median of $215.

Live fare — price verified 25 min ago.

Travel: 2026-09-11 – 2026-09-13
Book by: 9/3/2026
Booked via: Travelpayouts partner feed
Operated by: Frontier Airlines

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Last verified: 9/1/2026, 3:10:01 PM · Source: travelpayouts_api