Cheap Flights to Custer County from $85

View $85 flight on Wed, Apr 1, 2026Opens in a new window

Popular airlines to Custer County

  • Alaska Airlines

  • United

  • Delta

  • American Airlines

  • KLM

  • Air France

  • Virgin Atlantic

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How much is the cheapest flight to Custer County?

Prices were available within the past 7 days and start at $85 for one-way flights and $157 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Mar 14 - Fri, Mar 20
SEA
Seattle
SUN
Sun Valley
$157 Roundtrip, found 4 hours ago
$157
Roundtrip
found 4 hours ago
Select Delta flight, departing Sat, Mar 14 from Seattle to Sun Valley, returning Fri, Mar 20, priced at $157 found 4 hours ago
Delta
Sat, Mar 14 - Thu, Mar 19
SEA
Seattle
SUN
Sun Valley
$167 Roundtrip, found 4 hours ago
$167
Roundtrip
found 4 hours ago
Select Delta flight, departing Sat, Mar 14 from Seattle to Sun Valley, returning Thu, Mar 19, priced at $167 found 4 hours ago
Delta
Tue, Apr 21 - Tue, Apr 28
SFO
San Francisco
SUN
Sun Valley
$169 Roundtrip, found 2 days ago
$169
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Apr 21 from San Francisco to Sun Valley, returning Tue, Apr 28, priced at $169 found 2 days ago
Delta
Wed, Mar 18 - Sun, Apr 5
SEA
Seattle
SUN
Sun Valley
$177 Roundtrip, found 8 hours ago
$177
Roundtrip
found 8 hours ago
Select Delta flight, departing Wed, Mar 18 from Seattle to Sun Valley, returning Sun, Apr 5, priced at $177 found 8 hours ago
Alaska Airlines
Sat, Mar 14 - Wed, Mar 18
SEA
Seattle
SUN
Sun Valley
$177 Roundtrip, found 4 hours ago
$177
Roundtrip
found 4 hours ago
Select Alaska Airlines flight, departing Sat, Mar 14 from Seattle to Sun Valley, returning Wed, Mar 18, priced at $177 found 4 hours ago
Hawaiian Airlines
Sat, Mar 14 - Wed, Mar 18
SEA
Seattle
SUN
Sun Valley
$177 Roundtrip, found 4 hours ago
$177
Roundtrip
found 4 hours ago
Select Hawaiian Airlines flight, departing Sat, Mar 14 from Seattle to Sun Valley, returning Wed, Mar 18, priced at $177 found 4 hours ago
Alaska Airlines
Tue, Apr 14 - Sat, Apr 18
SFO
San Francisco
SUN
Sun Valley
$179 Roundtrip, found 2 days ago
$179
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Tue, Apr 14 from San Francisco to Sun Valley, returning Sat, Apr 18, priced at $179 found 2 days ago
Delta
Tue, Apr 14 - Sat, Apr 18
SFO
San Francisco
SUN
Sun Valley
$179 Roundtrip, found 2 days ago
$179
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Apr 14 from San Francisco to Sun Valley, returning Sat, Apr 18, priced at $179 found 2 days ago
United
Wed, Mar 25 - Sat, Mar 28
SAN
San Diego
SUN
Sun Valley
$237 Roundtrip, found 4 hours ago
$237
Roundtrip
found 4 hours ago
Select United flight, departing Wed, Mar 25 from San Diego to Sun Valley, returning Sat, Mar 28, priced at $237 found 4 hours ago
American Airlines
Tue, Mar 3 - Tue, Mar 10
SAN
San Diego
SUN
Sun Valley
$271 Roundtrip, found 3 days ago
$271
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Mar 3 from San Diego to Sun Valley, returning Tue, Mar 10, priced at $271 found 3 days ago

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Trending flights to Custer County

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Mar 14 - Fri, Mar 20
SEA
Seattle
SUN
Sun Valley
$157 Roundtrip, found 4 hours ago
$157
Roundtrip
found 4 hours ago
Select Delta flight, departing Sat, Mar 14 from Seattle to Sun Valley, returning Fri, Mar 20, priced at $157 found 4 hours ago

Frequently asked questions

How do I find cheap flights to Custer County that have flexible change policies?
Search for your bargain flights to Custer County, then mark the "No change fee" box underneath the "Flexible change policies" heading. It's as simple as that. We appreciate that plans can change and flexibility is essential, so you can book with confidence with Expedia.
Which airlines fly to Custer County?
With a great selection of airlines offering flights into or near Custer County, the choice is all yours:

  • Alaska Airlines - 754 flights to or near Custer County each month, including 754 flights to Boise Airport (BOI) per month.
  • Delta Air Lines - 489 flights to or near Custer County each month, including 489 flights to Boise Airport (BOI) per month.
  • United Airlines - 303 flights to or near Custer County each month, including 303 flights to Boise Airport (BOI) per month.

How can I find cheap tickets to Custer County?
An excellent strategy for getting your hands on cheap airfares is to be flexible with your dates. Start by searching for your flight to Custer County, then click on the "flexible dates" link to compare prices for nearby days. Another good tip? Book well ahead. To give you an idea of fares, $157 was the best price for a flight to Custer County in the last seven days.
How much is a flight to Custer County?
One-way flights leaving San Francisco (SFO) sold for as low as $85 in the last seven days. During this period, the price of a return journey to Custer County ranged between $157 and $271. If you find a bargain ticket, book immediately — these fares don't stick around.
What are the most popular airports to fly into in Custer County?
Start planning your Custer County trip by securing a seat on one of the 1,994 flights each month to Boise Airport (BOI). This is the region's main entryway.
When is the cheapest time to fly to Custer County?
Fly out on a Tuesday to increase your chances of getting the cheapest deal to Custer County. Mondays are usually the second most affordable day to take off. Saturday is normally the priciest day to fly anywhere.
How much is a plane ticket to Custer County?
In the last seven days, flights to Custer County varied between $157 and $271. Prices depend on the departure time, carrier, cabin class and when the fare is booked.
What months are the cheapest to book a flight to Custer County?
The best month to book a terrific deal to Custer County is February, whereas prices are at their highest in December. Keep clear of this month if you're counting your pennies.
How long is a flight to Custer County?
It could be an hour or two or more — it really depends on which part of the U.S. You're coming from. The average flight times for these top domestic routes to Custer County will give you a good idea of what to expect:

  • Seattle, WA (SEA-Seattle - Tacoma Intl.) to Boise Airport (BOI) - 1 hour and 26 minutes
  • Denver, CO (DEN-Denver Intl.) to Boise Airport (BOI) - 1 hour and 57 minutes
  • San Francisco, CA (SFO-San Francisco Intl.) to Boise Airport (BOI) - 1 hour and 40 minutes

What is the best time to go to Custer County?
May, June and July are the most popular months to explore Challis, one of Custer County's most famous cities. Summertime here starts June 20. Average temperatures range from 45ºF to 75ºF throughout the season, so travel around then if warmer weather is your preference.

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*Flight schedules are subject to change.

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