Seattle to Ontario (ONT) flight deals
Compare Seattle to Ontario (ONT) flights across upcoming months. See dated fares below, or choose your own dates and travelers.
Flights from Seattle (SEA) · Seattle to California flight deals · Seattle to Los Angeles area airports flight deals · Seattle to United States flight deals
Browse fares by month
February 2027 · March 2027 · April 2027 · May 2027 · June 2027 · July 2027 · August 2027
Fares observed September 17, 2026. USD for the travelers shown. Search a trip for current prices. For starting totals, choose a return flight to confirm the final price.
April 2027
1 adult · Economy · Round-trip starting totals
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Explore specific trips
- Seattle to Ontario (ONT) — Lake Washington midwinter break: flights February 11–14, 2027
- Seattle to Ontario (ONT) — Lake Washington midwinter break: flights February 12–15, 2027
- Seattle to Ontario (ONT): flights March 4–7, 2027
- Seattle to Ontario (ONT) — spring break: flights April 10–13, 2027
- Seattle to Ontario (ONT) — spring break: flights April 11–14, 2027
- Seattle to Ontario (ONT) — Lake Washington Memorial Day school break: flights May 28–31, 2027
More dates by month
- September 2026
- October 2026
- November 2026
- December 2026
- January 2027
- February 2027
- March 2027
- April 2027
- May 2027
- June 2027
- July 2027
- August 2027
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