Flights from Ontario to Seattle

3 deals on this route

Seattle skyline with Space Needle and Mount Rainier
Save 40%
$109
$183
Ontario California aerial with San Gabriel Mountains
ONTSEA
Ontario to Seattle
Frontier Airlines
Nonstop·round trip
May 2 – May 5
Seattle skyline with Space Needle and Mount Rainier
Save 38%
$114
$183
Ontario California aerial with San Gabriel Mountains
ONTSEA
Ontario to Seattle
Frontier Airlines
Nonstop·round trip
May 2 – May 5
Seattle skyline with Space Needle and Mount Rainier
$164
$183
Ontario California aerial with San Gabriel Mountains
ONTSEA
Ontario to Seattle
Alaska Airlines
Nonstop·round trip
May 1 – May 5