Alaska Airlines Flights from Ontario to Seattle
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1 Passenger
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Lowest fares from Ontario to Seattle
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One-way low-fare flights Ontario to Seattle.*
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From | To | Fare Type | Dates | Price | |
|---|---|---|---|---|---|
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: May 5, 2026 | From $89 Seen: 21 hours ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Apr 6, 2026 | From $89 Seen: 21 hours ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Apr 22, 2026 | From $89 Seen: 21 hours ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Apr 23, 2026 | From $89 Seen: 21 hours ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Apr 28, 2026 | From $89 Seen: 21 hours ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: May 6, 2026 | From $89 Seen: 21 hours ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: May 9, 2026 | From $89 Seen: 21 hours ago | |
| Ontario (ONT) | Seattle (SEA) | One-way | Saver | Depart: Apr 7, 2026 | From $89 Seen: 11 hours ago |
*Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.