Cheap flights from Ontario to Portland from $109

The cheapest month to fly to Portland from Ontario is in October. Flight prices, which tend to average around $201, are often lower during this time because this is during the off-season. If you don’t want to visit Portland in October, then you should wait until September to fly from Ontario, when ticket prices are also cheap, with an average price of $204.

The cheapest day to depart on your flight to Portland is on a Saturday when prices can be found for as low as $242. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Portland is Sunday, with ticket prices averaging around $298.

The cheapest time of day to fly to Portland is in the morning when flights can be purchased for as low as $262. At noon is when there is more demand to fly to Portland, so prices are often more expensive at around $292 per ticket.

Fly from Ontario to Portland for the best Ontario - Portland flight prices

You are more likely to see cheaper flights to Portland from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Portland for around $259 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portland from Ontario for as low as $173 on momondo.

There are 4 cabin classes available to choose from on Ontario to Portland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between Ontario to Portland.

As of August 2026, prices for Ontario to Portland flights are approximately 180% more expensive when compared to flights at the same time last year.

Frontier and Delta are the most popular carriers operating from Ontario to Portland

Alaska Airlines, Frontier and Delta are the top three most popular airlines that fly to Portland from Ontario according to our data. Alaska Airlines is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Portland. Keep in mind that there are 8 different airlines that fly to Portland on a routine basis, so you have a few additional options to choose from.

As of August 2026, there are 3 flights per day flying from Ontario to Portland. The most common time of day flights depart is 7:00AM, with 62% of flights taking off at noon.

The number of flights available between Ontario and Portland is 21 per week as of August 2026. The most frequent departure day is Thu, with 24% of weekly flights leaving on this day.