SEA
Seattle
ONT
Ontario
Seattle → Ontario
Frontier Airlines · Round Trip · Nonstop
Save $65 (37% off)
Compared to the typical price of $174
$109$174
per person · round trip
Flight Details
Cabin
Economy
Departs
Apr 21, 2026
Returns
Apr 25, 2026
Planning your trip to Ontario?
Complete your trip with these deals.