$106 Cheap Flights from Boise (BOI) to Washington (IAD)

View $106 flight on Tue, Sep 9, 2025Opens in a new window

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Find available prices by choosing your travel dates.

Cheap Flights from Boise to Washington (BOI-IAD)

Prices were available within the past 7 days and start at $106 for one-way flights and $212 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Tue, May 13 - Tue, May 27
BOI
Boise
IAD
Washington
$212 Roundtrip, found 7 hours ago
$212
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Tue, May 13 from Boise to Washington, returning Tue, May 27, priced at $212 found 7 hours ago
Hawaiian Airlines
Tue, May 13 - Wed, May 28
BOI
Boise
IAD
Washington
$244 Roundtrip, found 7 hours ago
$244
Roundtrip
found 7 hours ago
Select Hawaiian Airlines flight, departing Tue, May 13 from Boise to Washington, returning Wed, May 28, priced at $244 found 7 hours ago
Alaska Airlines
Sat, May 10 - Tue, May 27
BOI
Boise
IAD
Washington
$246 Roundtrip, found 7 hours ago
$246
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Sat, May 10 from Boise to Washington, returning Tue, May 27, priced at $246 found 7 hours ago
Alaska Airlines
Fri, May 16 - Tue, May 27
BOI
Boise
IAD
Washington
$256 Roundtrip, found 7 hours ago
$256
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Fri, May 16 from Boise to Washington, returning Tue, May 27, priced at $256 found 7 hours ago
Alaska Airlines
Mon, May 19 - Wed, May 28
BOI
Boise
IAD
Washington
$275 Roundtrip, found 11 hours ago
$275
Roundtrip
found 11 hours ago
Select Alaska Airlines flight, departing Mon, May 19 from Boise to Washington, returning Wed, May 28, priced at $275 found 11 hours ago
Alaska Airlines
Sat, May 10 - Wed, May 28
BOI
Boise
IAD
Washington
$277 Roundtrip, found 7 hours ago
$277
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Sat, May 10 from Boise to Washington, returning Wed, May 28, priced at $277 found 7 hours ago
Hawaiian Airlines
Sat, May 10 - Sat, May 31
BOI
Boise
IAD
Washington
$279 Roundtrip, found 7 hours ago
$279
Roundtrip
found 7 hours ago
Select Hawaiian Airlines flight, departing Sat, May 10 from Boise to Washington, returning Sat, May 31, priced at $279 found 7 hours ago
American Airlines
Sat, Aug 30 - Fri, Sep 5
BOI
Boise
IAD
Washington
$301 Roundtrip, found 1 day ago
$301
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Aug 30 from Boise to Washington, returning Fri, Sep 5, priced at $301 found 1 day ago
Delta
Wed, Jun 4 - Tue, Jun 10
BOI
Boise
IAD
Washington
$301 Roundtrip, found 1 hour ago
$301
Roundtrip
found 1 hour ago
Select Delta flight, departing Wed, Jun 4 from Boise to Washington, returning Tue, Jun 10, priced at $301 found 1 hour ago
United
Wed, Jul 2 - Wed, Jul 9
BOI
Boise
IAD
Washington
$301 Roundtrip, found 11 hours ago
$301
Roundtrip
found 11 hours ago
Select United flight, departing Wed, Jul 2 from Boise to Washington, returning Wed, Jul 9, priced at $301 found 11 hours ago
Flights from Boise (BOI) to Washington (IAD)
Origin airport
Boise
Destination airport
Washington Dulles Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$212
Distance
2020 mi

Boise to Washington Flights

The cheapest times to fly from Boise to Washington

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 Boise to Washington are during the month of May. You can find some of the cheapest flights from Boise to Washington with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Boise to Washington

Sunday is one of the best days to book for cheap flights from Boise to Washington: 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 Boise to Washington

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 Boise to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $106 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 Boise to Washington 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 Boise to Washington 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.

Frequently asked questions

How much does a flight from Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD) cost?
Discover the latest flight deals from BOI to IAD by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from BOI to IAD?
The cheapest flights from BOI to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from BOI to IAD?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from BOI to IAD. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD)?
Direct flights from Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD) aren’t available daily, so you’ll have to take a flight with a layover. Explore your options with Expedia’s filters. Enter your dates and select either “1 Stop” or “2+ Stops.”
What day of the week has the most flights from BOI to IAD?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can vary depending on various factors, such as the time of year 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 Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD)?
To avoid possible delays on the Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD) route, aim to travel before 3 PM. Later departures have a 22% higher chance of being 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 Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD) last-minute?
Last-minute fares from BOI to IAD are generally more expensive. For the lowest rates, start looking for flights as early as possible. That being said, if you’re flexible with your travel dates, it’s possible to land a cheap ticket right before your journey.
Is it cheaper to book a BOI to IAD flight and hotel package?
Compared with arranging hotels and flights separately, booking a BOI to IAD flight and hotel package with Expedia could lead to significant savings. What’s more, having everything in one easy place will take the hassle out of travel planning. Just pick your flights and select from our wide range of stays, then tailor your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD)?
Usually, it’s possible to reschedule or cancel your BOI to IAD flight. However, if it’s been more than 24 hours since booking, additional fees may apply. Refer to your airline’s policies in your itinerary to see what changes are allowed and if any costs are involved. You’ll also find further details on our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.