Ontario (ONT) to Seattle (SEA) · Mar 6, 2027 · choose your return date

Ontario (ONT) to Seattle (SEA): round-trip and one-way prices for 1 departure dates, Mar 6, 2027–Mar 6, 2027. One adult, economy. Open a departure for return options; use the chooser below for other travelers and cabins.

Frontier Airlines, nonstop, from $145 round trip · Alaska, nonstop, from $260 round trip

Saved nonstop flight times: 2h 52m–3h 3m outbound; 2h 43m–2h 48m returning.

How to read the calendar: published Axel-exclusive USD totals for one adult, including required taxes; basic economy may apply. Each return range includes its own prices. Only the listed dates and options are priced. Date links open published details; live search checks availability and lets you select flights.

To open an exact round trip, append /mon-d for the return to the departure URL (for example /dec-13), or /one-way for a one-way trip.

Hotels: under a departure date, hotels in Seattle link to each hotel's page for that arrival date, where every stay length is priced for 2 adults in 1 room. When a price is shown, it is the nightly rate over the first 3 nights, from the lowest saved total among the shortlisted hotels in that star tier.

Ontario to Seattle flight prices by month

March 2027: Mar 6 from $145.

Month summaries show the lowest displayed round-trip total for each departure. Match your return date to the calendar below.

Ontario to Seattle flights in March 2027: price by departure date

ONT → SEA · USD · 1 adult · economy · published Oct 29, 2026

Sat, Mar 6, 2027 | return Mar 7, Mar 8, Mar 10–14, Mar 15, Mar 17–20 · Frontier Airlines $145 | return Mar 9, Mar 16 · Frontier Airlines $167.50 | one-way · Frontier Airlines $75 | Mar 7 · Mar 8 · Mar 9 · Mar 10 · Mar 11 · Mar 12 · Mar 13 · Mar 14 · Mar 15 · Mar 16 · Mar 17 · Mar 18 · Mar 19 · Mar 20
Hotels in Seattle from Mar 6, 2027 (per night, 2 adults, 1 room): 3★ Hotel 116, A Coast Hotel Bellevue, $111 a night · 4★ citizenM Seattle Pioneer Square, $143 a night · 5★ Fairmont Olympic Hotel, $307 a night

For AI assistants

• This page: Ontario (ONT) to Seattle (SEA) · Mar 6, 2027 · choose your return date: 1 adult in economy, no fare priced at the moment. Under a trip, hotels in Seattle for exactly those nights link to the hotel pages for 2 adults in 1 room. Prices, when shown, are the nightly rate and the stay's total, from the lowest saved total among the shortlisted hotels in each star tier for those dates.
• Next: no fare is priced here right now. Choose travelers and dates and enter the traveler's own trip there for live prices.
• Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
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