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Washington, D.C.

$91+ Cheap flights from Idaho to Washington, D.C. (WAS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — WAS
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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Cheap flight deals from Idaho to Washington, D.C.

Cheapest flights from Idaho to Washington, D.C.
Explore the most affordable flight options available from Idaho to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This United Airlines deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/252:40 pmBOI - BWI
1 stop6h 36mUnited Airlines
Thu 1/18:15 amBWI - BOI
1 stop7h 21mUnited Airlines
Deal found 12/14$301
This Kiwi.com deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1910:41 pmBOI - DCA
2 stops36h 20mMultiple Airlines
Sat 1/106:00 pmDCA - BOI
1 stop19h 17mMultiple Airlines
Deal found 12/15$356
This Southwest deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:10 amBOI - DCA
1 stop8h 40mSouthwest
Thu 1/14:35 pmDCA - BOI
1 stop7h 50mSouthwest
Deal found 12/14$375
This Delta deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:19 pmBOI - BWI
1 stop9h 26mDelta
Thu 1/16:00 amBWI - BOI
1 stop8h 45mDelta
Deal found 12/14$409
This Southwest deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:15 amBOI - BWI
2 stops9h 45mSouthwest
Thu 1/12:45 pmBWI - BOI
2 stops10h 25mSouthwest
Deal found 12/14$479
This United Airlines deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/295:00 amIDA - IAD
1 stop8h 34mUnited Airlines
Thu 1/14:00 pmIAD - IDA
1 stop7h 14mUnited Airlines
Deal found 12/15$481
This United Airlines deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:55 pmBOI - BWI
1 stop8h 19mUnited Airlines
Sun 1/46:15 amBWI - BOI
1 stop8h 24mUnited Airlines
Deal found 12/15$509
This American Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:35 pmBOI - DCA
1 stop8h 24mAmerican Airlines
Sun 1/41:07 pmDCA - BOI
1 stop10h 58mAmerican Airlines
Deal found 12/17$537
This Delta deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2311:47 pmBOI - BWI
1 stop8h 30mDelta
Tue 1/206:05 amBWI - BOI
1 stop9h 29mDelta
Deal found 12/15$584
This United Airlines deal was found by Cheapflights users on 12/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3112:20 pmBOI - IAD
1 stop7h 01mUnited Airlines
Sun 1/46:20 amIAD - BOI
1 stop9h 16mUnited Airlines
Deal found 12/17$600
This Delta deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/231:00 pmBOI - IAD
1 stop8h 18mDelta
Tue 1/202:15 pmIAD - BOI
1 stop8h 40mDelta
Deal found 12/15$620
This United Airlines deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/286:55 pmBOI - BWI
1 stop8h 19mUnited Airlines
Wed 12/319:55 amBWI - BOI
1 stop10h 08mUnited Airlines
Deal found 12/14$620

Find flight deals from Idaho to Washington, D.C.

Keep the following information in mind while searching for Idaho to Washington, D.C. flight deals. Data was last updated December 18, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$203
(Expedia)

One-way from

$91
(Frontier)

Popular in

January

Cheapest in

August

Average price

$584
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Washington, D.C. (WAS) flights.
Search Deals
From Idaho to Washington, D.C. (WAS)
Search Deals
One-way flight from Idaho to Washington, D.C. (WAS)
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($169 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($47 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Idaho to Washington, D.C. that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 18, 2025.
Use the filters below to find and compare flights from Idaho to Washington, D.C. that are best for you.

Fly from

Idaho

Fly to

Washington, D.C.

Route

Depart

Return

Price

SpokaneWashington, D.C.

GEG - DCA

GEGDCA

Spokane

Thu 2/19

12:22 pm-12:04 pm

1 stop20h 42m

Washington, D.C. Reagan-National

Wed 2/25

8:00 am-11:27 am

1 stop30h 27m

$263

BoiseWashington, D.C.

BOI - DCA

BOIDCA

Boise Air Term. Gowen Fld

Sat 1/17

5:40 am-4:01 pm

1 stop8h 21m

Washington, D.C. Reagan-National

Mon 1/19

8:00 am-1:25 pm

1 stop7h 25m

$270

BoiseBaltimore

BOI - BWI

BOIBWI

Boise Air Term. Gowen Fld

Tue 1/13

9:15 am-11:26 pm

2 stops12h 11m

Baltimore/Washington

Tue 1/20

6:05 am-6:28 pm

2 stops14h 23m

$276

BoiseBaltimore

BOI - BWI

BOIBWI

Boise Air Term. Gowen Fld

Mon 1/12

10:39 am-11:44 pm

2 stops11h 05m

Baltimore/Washington

Wed 1/21

6:05 am-4:17 pm

2 stops12h 12m

$276

SpokaneBaltimore

GEG - BWI

GEGBWI

Spokane

Wed 1/7

9:20 am-11:44 pm

2 stops11h 24m

Baltimore/Washington

Tue 1/13

3:00 pm-12:08 am

2 stops12h 08m

$276

SpokaneBaltimore

GEG - BWI

GEGBWI

Spokane

Thu 1/8

7:20 am-11:26 pm

2 stops13h 06m

Baltimore/Washington

Tue 1/13

5:25 pm-12:08 am

2 stops9h 43m

$276

SpokaneBaltimore

GEG - BWI

GEGBWI

Spokane

Wed 1/7

11:25 am-11:44 pm

2 stops9h 19m

Baltimore/Washington

Wed 1/14

5:25 pm-12:08 am

2 stops9h 43m

$276

SpokaneBaltimore

GEG - BWI

GEGBWI

Spokane

Wed 1/7

9:20 am-11:44 pm

2 stops11h 24m

Baltimore/Washington

Mon 1/12

3:00 pm-12:08 am

2 stops12h 08m

$276

SpokaneBaltimore

GEG - BWI

GEGBWI

Spokane

Fri 2/6

9:20 am-11:26 pm

2 stops11h 06m

Baltimore/Washington

Sun 2/8

1:02 pm-10:48 pm

2 stops12h 46m

$276

SpokaneBaltimore

GEG - BWI

GEGBWI

Spokane

Fri 2/6

7:20 am-11:26 pm

2 stops13h 06m

Baltimore/Washington

Mon 2/9

7:00 am-2:55 pm

2 stops10h 55m

$276

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 60 results
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Best time to book a flight from Idaho to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Idaho with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Idaho to Washington, D.C.

What is the cheapest month to book a flight from Idaho to Washington, D.C.?

Currently, April is the cheapest month in which you can book a flight from Idaho to Washington, D.C. (average of $141). Flying from Idaho to Washington, D.C. in December is currently the most expensive (average of $367). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ID to WAS?

Find hourly flight availability from Idaho to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

It’s optimal to fly from Idaho to Washington, D.C. in the evening. By choosing this option you can save up to 32% on the cost of your flight, compared to a flight in the morning.

What is the cheapest day to fly from Idaho to Washington, D.C.?

Use this chart to determine the cheapest time to fly round-trip from Idaho to Washington, D.C.. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Idaho to Washington, D.C. flight should consider departing on Monday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

Find useful and relevant information for your journey from Idaho to Washington, D.C.. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Idaho to Washington, D.C.?

    Airlines like Frontier, Delta, and Alaska Airlines fly from Idaho to Washington, D.C. in about 12h 11m. The time it takes to get you to your destination can typically vary by up to 12h 20m. There are 2052 mi between Idaho and Washington, D.C.. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Idaho to Washington, D.C. one-way?

    One-way options have recently been found by users for as low as $104 on Frontier. Other airlines that offer cheap prices include Delta from $125 and United Airlines from $150 one-way.

  • What are the most popular routes from Idaho to Washington, D.C.?

    When deciding which route to take from Idaho to Washington, D.C. consider Spokane - Washington, D.C. Dulles Intl, Boise Air Term. Gowen Fld - Washington, D.C. Dulles Intl or Boise Air Term. Gowen Fld - Baltimore/Washington as they are the most popular.

  • Can I find deals for flights from Idaho to Washington, D.C. that include hotel bookings?

    Yes. In addition to deals on Idaho to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Idaho to Washington, D.C.?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to Washington, D.C..

  • Can I find deals for business class flights from Idaho to Washington, D.C.?

    Yes. Cheapflights offers flight deals from Idaho to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Idaho to Washington, D.C.?

    Currently, April is the cheapest month in which you can book a flight from Idaho to Washington, D.C. (average of $141). Flying from Idaho to Washington, D.C. in December is currently the most expensive (average of $367). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fredericksburg
Linthicum Heights
Rockville
Laurel
Towson
Manassas
National Harbor
Bowie
Largo
McLean
Clinton
Cordova

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Idaho to Washington, D.C.

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Idaho to Washington, D.C.

Discover the top 5 airlines that operate flights from Idaho to Washington, D.C.. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$141Average$381FlexibilityNo cancel feeOn-time75%
DeltaCheapest$249Average$435FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$300Average$544FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$300Average$540FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$351Average$478FlexibilityNo cancel feeOn-time63%

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