Seattle to Ontario in October 2026
SEA to ONT · Round trips departing in October · Economy · Prices per person in USD
Prices updated
Buy now or wait? We're still learning this route. We have 2 days of prices so far and need about a week to say whether to book or wait.
Not ready to book? Get an email when October fares drop below your price.October 2026 by departure day
Cheapest round trip leaving that day| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 $469 | |||
| 5 | 6 | 7 $370 | 8 | 9 | 10 | 11 |
| 12 | 13 $352 | 14 $311 | 15 | 16 | 17 | 18 |
| 19 | 20 | 21 | 22 | 23 | 24 $175 | 25 |
| 26 | 27 | 28 | 29 | 30 | 31 |
Empty days: no round trip found for that departure date yet. Green = cheapest third of the month.
Cheapest dates in October 2026
Round trip, per person-
Oct 24 – 26 2 nights · leave Sat$175Frontier Airlines 1 stop · 5h 11mBook
-
Oct 14 – 21 7 nights · leave Wed$311Alaska Airlines Nonstop · 2h 32mBook
-
Oct 13 – 15 2 nights · leave Tue$352Frontier Airlines 1 stop · 5h 11mBook
-
Oct 7 – 11 4 nights · leave Wed$370Frontier Airlines Nonstop · 2h 52mBook
-
Oct 4 – 6 2 nights · leave Sun$469Frontier Airlines Nonstop · 2h 52mBook
Prices change often. The booking site shows the final price before you pay.
Cheapest by trip length
Good to know for October
October vs other months
Cheapest round trip per departure month| Month | Cheapest round trip |
|---|---|
| October 2026 | $175 (cheapest month) |
| November 2026 | $272 |
| December 2026 | $294 |
| January 2027 | $242 |
| February 2027 | No fares found yet |
| March 2027 | No fares found yet |
| April 2027 | $383 |
Seattle to Ontario in October: questions
What's the cheapest date to fly from Seattle to Ontario in October 2026?
Leaving Saturday, October 24 and returning Monday, October 26 (2 nights) for $175 round trip on Frontier Airlines, the cheapest of the 5 date combinations we track that month.
How much is a round trip from Seattle to Ontario in October 2026?
From $175. Half of the 5 date combinations we track are under $352. Prices are per person in USD and change often.
Is October a cheap month to fly from Seattle to Ontario?
Yes. It's the cheapest of the 5 months ahead we have prices for.