$174 Find Cheap Flights from Seattle to Idaho Falls - Compare and Save

Among airlines operating Seattle to Idaho Falls flights:

• Alaska Airlines: offers extra legroom; offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Only Alaska Airlines operates flights between Seattle and Idaho Falls.

Flights from Seattle to Idaho Falls usually depart from Seattle/Tacoma Intl (SEA) and arrive at Idaho Falls Fanning Field (IDA).

Here are some options for this route, based on selected ticket types and cabin classes:

• Alaska Airlines: a cabin bag and a checked bag in Economy Class

Bag allowance can vary by ticket type, cabin class, route and airline, so travelers should check the fare details before booking.

Only Economy Class is available on flights from Seattle to Idaho Falls.

On this route, nonstop flights are cheaper than layover options on average. Nonstop fares average $327 round-trip, compared to $355 via a layover through Portland (PDX).

Connecting flights from Seattle to Idaho Falls most commonly pass through:

• Portland (PDX) - 53% of one-stop connections
• Salt Lake City (SLC) - 47% of one-stop connections
Together, these airports account for 100% of one-stop bookings on this route.

Yes. Being flexible with your travel dates can save you up to 37% on the Seattle to Idaho Falls route. Tuesday is the cheapest departure day at $277 round-trip on average, while Wednesday is the most expensive at $438, a difference of $161. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Afternoon is the busiest departure period on Seattle to Idaho Falls flights, with 50% of flights leaving in that window. Evening departures account for 50%, morning flights for 0%, and night flights for 0%.

These are the earliest and latest flight times available from Seattle to Idaho Falls:

• Earliest: departs at 12:14 pm and lands at 2:04 pm
• Latest: departs at 8:10 pm and lands at 10:00 pm.

The flight takes about 1h 50m.

A nonstop flight from Seattle to Idaho Falls takes 1h 50m, covering 565 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $297 to $2,540. That means the highest observed fare was about 9x higher than the lowest one.

One-way fares from Seattle to Idaho Falls are currently higher than usual. Average one-way flight prices are about $244, which is 17% above the typical average for this route.

Flying via Portland (PDX) gives the shortest average 1-stop total travel time at 4h 22m, compared with 4h 23m via Salt Lake City (SLC).

Idaho Falls is 1 hour ahead of Seattle (Mountain Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

Idaho Falls Fanning Field Airport (IDA) hosts 5 major car rental companies, with daily rates starting from around $34 for economy cars. Top options include:
• Alamo
• Hertz
• Enterprise Rent-A-Car
• Budget
• National

Round-trip flights from Seattle to Idaho Falls range from $247 to $439, with an average of $326 over the past 12 months. Anything below $247 counts as a good deal.

Alaska Airlines is the only airline on the Seattle to Idaho Falls route offering in-flight Wi-Fi. Pricing depends on fare class.