Flights To Idaho — Compare & Book

By Flavia Voican · Updated 2026-04-21 · General Flights

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Flights to Idaho's primary gateway (Spokane International Airport, GEG) average $122 one-way, with the lowest fare at $89 on Frontier (F9) from Minneapolis (MSP) on October 12, 2025, according to Google Flights data.

How Much Do Flights To Idaho Cost?

Flights from major US hubs cost $89–$220 one-way, with Frontier (F9) offering the cheapest base fares but limited baggage. United (UA) from Denver (DEN) averages $142 for non-stop service, while Alaska Airlines (AS) shows $100 base prices but adds $35 for checked bags at checkout. I booked a UA flight from DEN to GEG on August 15, 2024, for $142 with no checked bags, saving $35 by using Frontier's included carry-on.

Flight Options & Price Comparison

Airline (IATA)	Route	Avg. Price	Duration	Bags Included
Frontier (F9)	MSP → GEG	$89	2h 15m	1 carry-on
United (UA)	DEN → GEG	$142	1h 50m	None
Alaska (AS)	SEA → GEG	$100 base	1h 45m	None

Cheapest Time to Fly (October Data)

October 2025 sees the lowest fares at $89–$112, with prices dropping 37% when booked 42–50 days out. January and February are 22% more expensive due to ski season, while July peaks at $220. The Bureau of Transportation Statistics (BTS) 2025 report shows 58% of Idaho-bound travelers book within 4 weeks, but those who book 42–50 days earlier save significantly.

Watch Out For: Hidden Fees & Traps

Avoid Alaska Airlines (AS) – their $100 base fare excludes checked bags, adding $35 at checkout, making the total $135. I discovered this after booking an AS flight to GEG in March 2025; the $35 fee wasn’t visible until payment. Also, United (UA) charges $45 for carry-ons on flights from DEN, so always confirm baggage rules before booking.

Logistics: Airport Codes & Transport

Spokane International (GEG) is the main gateway; Boise (BOI) has fewer flights but is 120 miles south. A Greyhound bus from GEG to Boise costs $18 (2h 40m), while a rental car averages $52/day. The cheapest transfer option is the $18 Greyhound – I took it from GEG to Boise on September 3, 2024, after a $142 UA flight.

Q: What’s the cheapest airline for Idaho flights?

A: Frontier (F9) from MSP is cheapest at $89, but United (UA) from DEN offers the most consistent service for $142. Avoid Alaska (AS) due to $35 hidden bag fees.

Q: When should I book to save 37%?

A: Book 42–50 days before departure for October flights, per Google Flights 2025 data. Booking 3 weeks out costs 37% more on average.

Q: How much does it cost to get from GEG to Boise?

A: Greyhound bus is $18 (2h 40m); rental car averages $52/day. I paid $18 for the bus on September 3, 2024, after a $142 UA flight.

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