Cheap flights from Idaho Falls to Portland from $51

The cheapest month to fly to Portland from Idaho Falls is in June. Flight prices, which tend to average around $114, are often lower during this time because this is during the off-season. If you don’t want to visit Portland in June, then you should wait until May to fly from Idaho Falls, when ticket prices are also cheap, with an average price of $147.

The cheapest day to depart on your flight to Portland is on a Monday when prices can be found for as low as $132. 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 Tuesday, with ticket prices averaging around $498.

The cheapest time of day to fly to Portland is in the afternoon when flights can be purchased for as low as $177. At noon is when there is more demand to fly to Portland, so prices are often more expensive at around $185 per ticket.

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

You are more likely to see cheaper flights to Portland from Idaho Falls when booking weeks ahead of your departure date. In general, you can expect to find flights to Portland for around $315 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portland from Idaho Falls for as low as $105 on momondo.

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

As of April 2026, prices for Idaho Falls to Portland flights are approximately 13% cheaper when compared to flights at the same time last year.

Allegiant Air, Alaska Airlines, and Delta are the most popular carriers operating from Idaho Falls Fanning Field to Portland

Allegiant Air, Alaska Airlines and Delta are the top three most popular airlines that fly to Portland from Idaho Falls according to our data. Allegiant Air is the first choice among our users, with 37% 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.

Salt Lake City (SLC) was the most common stop: 50% of momondo users choosing 1-stop flights on this route connected there.

Flights via Seattle (SEA) offer the lowest average round-trip price of $597.

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 3h 55m.

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 27m.