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

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

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

Cheap Flights from Boise to Washington (BOI-IAD)

Prices were available within the past 7 days and start at $145 for one-way flights and $318 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Jan 20 - Fri, Jan 23
BOI
Boise
IAD
Washington
$318 Roundtrip, found 5 days ago
$318
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Jan 20 from Boise to Washington, returning Fri, Jan 23, priced at $318 found 5 days ago
Alaska Airlines
Tue, Dec 9 - Sat, Dec 13
BOI
Boise
IAD
Washington
$320 Roundtrip, found 3 days ago
$320
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Tue, Dec 9 from Boise to Washington, returning Sat, Dec 13, priced at $320 found 3 days ago
Southwest Airlines
Sat, Dec 13 - Tue, Dec 16
BOI
Boise
IAD
Washington
$321 Roundtrip, found 3 days ago
$321
Roundtrip
found 3 days ago
Select Southwest Airlines flight, departing Sat, Dec 13 from Boise to Washington, returning Tue, Dec 16, priced at $321 found 3 days ago
United
Tue, Dec 2 - Sat, Dec 6
BOI
Boise
IAD
Washington
$321 Roundtrip, found 3 days ago
$321
Roundtrip
found 3 days ago
Select United flight, departing Tue, Dec 2 from Boise to Washington, returning Sat, Dec 6, priced at $321 found 3 days ago
Hawaiian Airlines
Wed, Dec 24 - Fri, Jan 9
BOI
Boise
IAD
Washington
$326 Roundtrip, found 2 days ago
$326
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Wed, Dec 24 from Boise to Washington, returning Fri, Jan 9, priced at $326 found 2 days ago
Delta
Tue, Jan 20 - Sun, Jan 25
BOI
Boise
IAD
Washington
$328 Roundtrip, found 5 days ago
$328
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Jan 20 from Boise to Washington, returning Sun, Jan 25, priced at $328 found 5 days ago
Alaska Airlines
Wed, Dec 24 - Mon, Jan 5
BOI
Boise
IAD
Washington
$330 Roundtrip, found 2 days ago
$330
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Dec 24 from Boise to Washington, returning Mon, Jan 5, priced at $330 found 2 days ago
Hawaiian Airlines
Tue, Feb 24 - Tue, Mar 10
BOI
Boise
IAD
Washington
$331 Roundtrip, found 3 days ago
$331
Roundtrip
found 3 days ago
Select Hawaiian Airlines flight, departing Tue, Feb 24 from Boise to Washington, returning Tue, Mar 10, priced at $331 found 3 days ago
Hawaiian Airlines
Wed, Feb 25 - Mon, Mar 2
BOI
Boise
IAD
Washington
$332 Roundtrip, found 5 days ago
$332
Roundtrip
found 5 days ago
Select Hawaiian Airlines flight, departing Wed, Feb 25 from Boise to Washington, returning Mon, Mar 2, priced at $332 found 5 days ago
Alaska Airlines
Thu, Nov 27 - Tue, Dec 9
BOI
Boise
IAD
Washington
$335 Roundtrip, found 6 hours ago
$335
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Thu, Nov 27 from Boise to Washington, returning Tue, Dec 9, priced at $335 found 6 hours ago

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

September is typically the cheapest month to fly

From $209 - $535 per traveler.

Alternative airports near Washington

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

Select flight to Ronald Reagan Washington National DCA. Closest option available. Average driving time to city center is 8 minutes. Flights from $508
DCA
Ronald Reagan Washington National
Closest
Average driving time to city center8 min
Flights from $508

Frequently asked questions

How much does a flight from Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD) cost?
Get a cheap one-way flight from $145 or cheap return flight from $318 from Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD)?
The cheapest month to fly from BOI to IAD is January, when there's less demand. Off-peak months are usually when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Boise Airport (BOI) to Washington Dulles Intl. Airport (IAD)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll fly you from BOI to IAD. Then, sort your results by "Price (lowest to highest)" to snag the best deal available.
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.

Travel information

Origin airport
Boise
Destination airport
Washington Dulles Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, Southwest Airlines, United
Roundtrip price
$318
Distance
2020 mi

Book with confidence

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 January. 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 $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 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.

 

Boise to Washington Flights

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*Available to One Key members.