Cheap flights from Portland to Idaho from $46

In general, July is the cheapest month to fly from Portland to Idaho. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $44. If you don’t want to visit Idaho in July, then you should wait until May to fly from Portland, when ticket prices are also cheap, with an average price of $51.

Our data shows that Wednesday is the least expensive day to fly to Idaho. Tickets to fly out on this day can be as low as $255. On the other hand, Sunday is the most expensive day to depart from Portland because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $348.

According to our data, the cheapest time of day to fly to Idaho is in the evening. momondo users have found flights departing from Portland to Idaho in the evening for as low as $251. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In the afternoon is when there is more demand to fly to Idaho, so prices are often more expensive at around $297 per ticket.

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

You are more likely to see cheaper flights to Idaho from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to Idaho for around $270 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Idaho from Portland for as low as $181 on momondo.

Allegiant Air, Southwest, and Delta are the most popular carriers operating from Portland to Idaho

Alaska Airlines, Delta and Hawaiian Airlines are the top three most popular airlines that fly to Idaho from Portland 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 Idaho. Keep in mind that there are 4 different airlines that fly to Idaho 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 Portland to Idaho. The most common time of day flights depart is 9:00PM, with 43% of flights taking off at noon.

The number of flights available between Portland and Idaho is 74 per week as of May 2026. The most frequent departure day is Mon, with 18% of weekly flights leaving on this day.