Cheap flights from Idaho to Portland from $38

The cheapest month to fly to Portland from Idaho is in August. Flight prices, which tend to average around $45, are often lower during this time because this is during the off-season. If you don’t want to visit Portland in August, then you should wait until June to fly from Idaho, when ticket prices are also cheap, with an average price of $45.

The cheapest day to depart on your flight to Portland is on a Friday when prices can be found for as low as $322. 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 $480.

The cheapest time of day to fly to Portland is in the afternoon when flights can be purchased for as low as $302. In the morning is when there is more demand to fly to Portland, so prices are often more expensive at around $420 per ticket.

Fly from Idaho Falls Fanning Field to Portland for the best Idaho - Portland flight prices

You are more likely to see cheaper flights to Portland from Idaho when booking weeks ahead of your departure date. In general, you can expect to find flights to Portland for around $248 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portland from Idaho for as low as $167 on momondo.

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

Allegiant Air, United Airlines, and Alaska Airlines are the most popular carriers operating from Idaho to Portland

Alaska Airlines, Delta and Allegiant Air are the top three most popular airlines that fly to Portland from Idaho according to our data. Alaska Airlines is the first choice among our users, with 71% of people opting to fly with this airline when traveling to Portland. Keep in mind that there are 4 different airlines that fly to Portland on a routine basis, so you have a few additional options to choose from.

As of May 2026, there are 10 flights per day flying from Idaho to Portland. The most common time of day flights depart is 4:00PM, with 52% of flights taking off in the afternoon.

As of May 2026, there are 74 flights per week flying from Idaho to Portland. The most common day of the week flights depart is Wed, with 19% of flights taking off on this day.