$145 Cheap Flights from Washington (IAD) to Boise (BOI)

View $145 flight on Thu, Feb 19, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI)

Cheap Flights from Washington to Boise (IAD-BOI)

Prices were available within the past 7 days and start at $145 for one-way flights and $290 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Tue, Feb 17 - Fri, Feb 20
IAD
Washington
BOI
Boise
$290 Roundtrip, found 5 days ago
$290
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Tue, Feb 17 from Washington to Boise, returning Fri, Feb 20, priced at $290 found 5 days ago
United
Tue, Dec 16 - Thu, Dec 25
IAD
Washington
BOI
Boise
$316 Roundtrip, found 3 days ago
$316
Roundtrip
found 3 days ago
Select United flight, departing Tue, Dec 16 from Washington to Boise, returning Thu, Dec 25, priced at $316 found 3 days ago
Alaska Airlines
Tue, Jan 6 - Tue, Jan 20
IAD
Washington
BOI
Boise
$320 Roundtrip, found 21 hours ago
$320
Roundtrip
found 21 hours ago
Select Alaska Airlines flight, departing Tue, Jan 6 from Washington to Boise, returning Tue, Jan 20, priced at $320 found 21 hours ago
Delta
Sat, Feb 21 - Sat, Feb 28
IAD
Washington
BOI
Boise
$321 Roundtrip, found 14 hours ago
$321
Roundtrip
found 14 hours ago
Select Delta flight, departing Sat, Feb 21 from Washington to Boise, returning Sat, Feb 28, priced at $321 found 14 hours ago
Hawaiian Airlines
Tue, Feb 17 - Sun, Feb 22
IAD
Washington
BOI
Boise
$327 Roundtrip, found 5 days ago
$327
Roundtrip
found 5 days ago
Select Hawaiian Airlines flight, departing Tue, Feb 17 from Washington to Boise, returning Sun, Feb 22, priced at $327 found 5 days ago
Delta
Sat, Feb 14 - Fri, Feb 27
IAD
Washington
BOI
Boise
$328 Roundtrip, found 4 days ago
$328
Roundtrip
found 4 days ago
Select Delta flight, departing Sat, Feb 14 from Washington to Boise, returning Fri, Feb 27, priced at $328 found 4 days ago
Alaska Airlines
Tue, Feb 17 - Fri, Feb 20
IAD
Washington
BOI
Boise
$331 Roundtrip, found 5 days ago
$331
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Tue, Feb 17 from Washington to Boise, returning Fri, Feb 20, priced at $331 found 5 days ago
Hawaiian Airlines
Tue, Dec 9 - Wed, Dec 24
IAD
Washington
BOI
Boise
$331 Roundtrip, found 21 hours ago
$331
Roundtrip
found 21 hours ago
Select Hawaiian Airlines flight, departing Tue, Dec 9 from Washington to Boise, returning Wed, Dec 24, priced at $331 found 21 hours ago
Delta
Wed, Mar 4 - Sat, Mar 7
IAD
Washington
BOI
Boise
$332 Roundtrip, found 3 days ago
$332
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Mar 4 from Washington to Boise, returning Sat, Mar 7, priced at $332 found 3 days ago
American Airlines
Sat, Dec 13 - Mon, Jan 12
IAD
Washington
BOI
Boise
$356 Roundtrip, found 2 hours ago
$356
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, Dec 13 from Washington to Boise, returning Mon, Jan 12, priced at $356 found 2 hours ago

Find the cheapest month to fly from Washington (IAD) to Boise (BOI)

September is typically the cheapest month to fly

From $200 - $442 per traveler.

Alternative airports near Boise

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Boise Airport BOI. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $484
BOI
Boise Airport
CheapestClosest
Average driving time to city center8 min
Flights from $484

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI) cost?
Lock in a cheap one-way flight from $145 or cheap return flight from $290 from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI)?
February is the cheapest month to fly from IAD to BOI. Traveling during an off-peak travel window is often the key to better flight prices.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI)?
Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll fly you from IAD to BOI. Then, sort your results by "Price (lowest to highest)" to pick up the best deal available.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI)?
You'll need to book a flight with a layover when traveling from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from IAD to BOI?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary depending on various factors, such as the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI)?
Opt for a flight from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI) that leaves before 3 PM to reduce the likelihood of delays and cancellations. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI) last-minute?
Last-minute bookings from IAD to BOI are typically more expensive. To secure the lowest rates, start looking for flights ahead of time. That said, if you can play around with your travel dates, it's possible to land a cheap fare right before your trip.
Is it cheaper to book an IAD to BOI flight and hotel package?
Opting for an IAD to BOI flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Pick from our extensive range of accommodations and then add activities, car rentals and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Boise Airport (BOI)?
If you reserved your IAD to BOI flight in the last 24 hours, you may be able to cancel or modify it at no cost. 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 want more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Boise
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$290
Distance
2020 mi

Book with confidence

Washington to Boise Flights

The cheapest times to fly from Washington to Boise

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Boise are during the month of February. You can find some of the cheapest flights from Washington to Boise with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Boise

Sunday is one of the best days to book for cheap flights from Washington to Boise: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Boise

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Boise in 2025. You can also book with separate airlines for your outbound and return journeys, from $145 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Boise flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Boise airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Washington to Boise Flights

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*Available to One Key members.