Book United Ontario to Seattle flight deals from $1,039

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Downtown Seattle at sunset

Plan ahead for flights from Ontario to Seattle

from
to
Type
Dates
Price*
Ontario (ONT)
to Seattle (SEA)
Roundtrip
Depart Tue 21 May 2019
Return Tue 28 May 2019
from$ 1,039*Viewed: 58 minutes ago
*Prices have been available for round trips within the last 48 hours and may not be currently available. Fares listed may be Basic Economy, which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for other optional service may apply. Other terms and conditions may apply.

Weather in Seattle

64 °FMonday06/25/2018
64 °FTuesday06/26/2018
64 °FWednesday06/27/2018
58 °FThursday06/28/2018
54 °FFriday06/29/2018
55 °FSaturday06/30/2018
52 °FSunday07/01/2018
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