£424 Cheap Flights from Boston (BOS) to Sun Valley (SUN)

View £424 flight on Fri, 26 Jun 2026Opens in a new window

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Popular airlines from Logan International Airport (BOS) to Sun Valley, ID (SUN-Friedman Memorial)

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Cheap Flights from Boston (BOS) to Sun Valley (SUN)

Prices were available within the past 7 days and start at £424 for one-way flights and £633 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Thu, 23 Jul - Sun, 26 Jul
BOS
Boston
SUN
Sun Valley
£633 Return, found 5 days ago
£633
Return
found 5 days ago
Select Alaska Airlines flight, departing Thu, 23 Jul from Boston to Sun Valley, returning Sun, 26 Jul, priced at £633 found 5 days ago
Alaska Airlines
Thu, 23 Jul - Sun, 26 Jul
BOS
Boston
SUN
Sun Valley
£732 Return, found 5 days ago
£732
Return
found 5 days ago
Select Alaska Airlines flight, departing Thu, 23 Jul from Boston to Sun Valley, returning Sun, 26 Jul, priced at £732 found 5 days ago
Alaska Airlines
Thu, 23 Jul - Sun, 26 Jul
BOS
Boston
SUN
Sun Valley
£744 Return, found 5 days ago
£744
Return
found 5 days ago
Select Alaska Airlines flight, departing Thu, 23 Jul from Boston to Sun Valley, returning Sun, 26 Jul, priced at £744 found 5 days ago
Alaska Airlines
Thu, 23 Jul - Sun, 26 Jul
BOS
Boston
SUN
Sun Valley
£776 Return, found 5 days ago
£776
Return
found 5 days ago
Select Alaska Airlines flight, departing Thu, 23 Jul from Boston to Sun Valley, returning Sun, 26 Jul, priced at £776 found 5 days ago
Alaska Airlines
Thu, 23 Jul - Sun, 26 Jul
BOS
Boston
SUN
Sun Valley
£862 Return, found 5 days ago
£862
Return
found 5 days ago
Select Alaska Airlines flight, departing Thu, 23 Jul from Boston to Sun Valley, returning Sun, 26 Jul, priced at £862 found 5 days ago
Alaska Airlines
Thu, 23 Jul - Sun, 26 Jul
BOS
Boston
SUN
Sun Valley
£1,000 Return, found 5 days ago
£1,000
Return
found 5 days ago
Select Alaska Airlines flight, departing Thu, 23 Jul from Boston to Sun Valley, returning Sun, 26 Jul, priced at £1,000 found 5 days ago
Alaska Airlines
Thu, 23 Jul - Sun, 26 Jul
BOS
Boston
SUN
Sun Valley
£1,004 Return, found 5 days ago
£1,004
Return
found 5 days ago
Select Alaska Airlines flight, departing Thu, 23 Jul from Boston to Sun Valley, returning Sun, 26 Jul, priced at £1,004 found 5 days ago
Alaska Airlines
Thu, 23 Jul - Sun, 26 Jul
BOS
Boston
SUN
Sun Valley
£1,014 Return, found 5 days ago
£1,014
Return
found 5 days ago
Select Alaska Airlines flight, departing Thu, 23 Jul from Boston to Sun Valley, returning Sun, 26 Jul, priced at £1,014 found 5 days ago
Alaska Airlines
Thu, 23 Jul - Sun, 26 Jul
BOS
Boston
SUN
Sun Valley
£1,057 Return, found 5 days ago
£1,057
Return
found 5 days ago
Select Alaska Airlines flight, departing Thu, 23 Jul from Boston to Sun Valley, returning Sun, 26 Jul, priced at £1,057 found 5 days ago

Frequently asked questions

How do I find cheap flights from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial)?
To find a cheap flight from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial)?
There are approximately 23 connecting flights per day from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial). Some common connection points include Portland Intl. (PDX), O'Hare Intl. (ORD), and San Diego Intl. (SAN).
What is the earliest flight from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial)?
The earliest flight from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) typically departs at approximately 5:00 AM local time, operated by Alaska Airlines. This is a seasonal service active in October. An early departure like this can help maximize your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial)?
You'll typically find the most flights from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) on a Tuesday, with around 29 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include United Airlines, Alaska Airlines, and Delta Air Lines. Compared to other days, Tuesdays offer notably more flight options.
What are the most popular departure times for flights from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial)?
The most popular departure times for flights from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) are in the early morning, from 6am to 9am. About 59% of passengers prefer this time. Many major carriers, including American Airlines, United Airlines and Delta Air Lines, offer flights during this window. This timing works well because it allows you to get an early start on your journey and arrive at your destination with plenty of time to settle in.
How long does it take to fly from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial)?
A flight from BOS to SUN with a layover takes around 8 hours 20 minutes, with the route covering approximately 2,166 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial)?
Select the "Business class" and "First class" filters when looking for BOS to SUN flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) flight with Expedia?
It's easy to earn miles on a Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Sun Valley from Logan Intl. (BOS)?
If you're planning to travel to Sun Valley from Logan Intl. (BOS), you can fly into Friedman Memorial (SUN) Some flights may connect through major hubs like O'Hare Intl. (ORD), Portland Intl. (PDX), Liberty Intl. (EWR) before reaching Sun Valley. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) at the last minute?
Typically, booking a last minute flight from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) flight and hotel package?
Securing a Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial)?
If you booked your Boston, MA (BOS-Logan Intl.) to Sun Valley, ID (SUN-Friedman Memorial) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Logan Intl.
Destination airport
Friedman Memorial
Return price
£632
Distance
3465 km

Book with confidence

Compare flights from Boston to Sun Valley easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Boston to Sun Valley. Operating between them flights per day, 14 airlines cover the route. And fly direct, getting you to Friedman Memorial in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Logan Intl. to Friedman Memorial.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Logan Intl. (BOS) to Friedman Memorial (SUN)

The easiest way to view the best deals on flights from Boston to Sun Valley today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Logan Intl. to Friedman Memorial start at just £633 and range up to £1,057.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Boston and Sun Valley
  • booking your flight during July, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Boston to Sun Valley flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Logan Intl. to Friedman Memorial for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Boston to Sun Valley easily and book with confidence

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*Available to Expedia members.