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Ontario California aerial with San Gabriel Mountains
ONT
Ontario
Seattle skyline with Space Needle and Mount Rainier
SEA
Seattle

Ontario → Seattle

Frontier Airlines · Round Trip · Nonstop

Save $69 (38% off)
Compared to the typical price of $183
$114$183

per person · round trip

Book This Deal

Flight Details

Cabin
Economy
Departs
May 2, 2026
Returns
May 5, 2026

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