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Washington, D.C.

$111+ 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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — WAS
févr. 28 — mars 71
sam. 2/28
sam. 3/7
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 janvier 29, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 2/246:28 am
BOI
-
IAD
1 stop8h 52m
Alaska Airlines
mar. 3/37:05 am
IAD
-
BOI
1 stop10h 03m
Alaska Airlines
Deal found 1/26$257
This Delta deal was found by Cheapflights users on 1/28. 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.
mer. 2/1811:22 am
GEG
-
IAD
1 stop8h 48m
Delta
mer. 2/257:30 am
IAD
-
GEG
1 stop10h 28m
Delta
Deal found 1/28$257
This Delta deal was found by Cheapflights users on 1/28. 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.
sam. 4/253:23 pm
BOI
-
DCA
1 stop6h 20m
Delta
mar. 4/284:39 pm
DCA
-
BOI
1 stop9h 38m
Delta
Deal found 1/28$257
This Delta deal was found by Cheapflights users on 1/28. 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.
mer. 2/1812:48 pm
GEG
-
DCA
1 stop7h 44m
Delta
mer. 2/254:44 pm
DCA
-
GEG
1 stop10h 20m
Delta
Deal found 1/28$257
This Delta deal was found by Cheapflights users on 1/28. 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.
mer. 4/15:30 am
BOI
-
BWI
1 stop6h 30m
Delta
mar. 4/76:00 am
BWI
-
BOI
1 stop8h 38m
Delta
Deal found 1/28$257
This Delta deal was found by Cheapflights users on 1/28. 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.
mer. 2/1812:48 pm
GEG
-
BWI
1 stop8h 47m
Delta
mer. 2/256:00 am
BWI
-
GEG
1 stop8h 35m
Delta
Deal found 1/28$257
This Delta deal was found by Cheapflights users on 1/27. 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.
mar. 3/1010:35 am
BOI
-
IAD
2 stops11h 06m
Delta
sam. 3/147:00 am
IAD
-
BOI
1 stop8h 05m
Delta
Deal found 1/27$262
This United Airlines deal was found by Cheapflights users on 1/27. 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.
mer. 2/252:40 pm
BOI
-
BWI
1 stop6h 45m
United Airlines
mer. 3/410:30 am
BWI
-
BOI
2 stops12h 25m
United Airlines
Deal found 1/27$262
This Delta deal was found by Cheapflights users on 1/26. 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.
mar. 2/248:50 am
BOI
-
IAD
2 stops13h 05m
Delta
mar. 3/36:00 am
IAD
-
BOI
2 stops9h 58m
Delta
Deal found 1/26$268
This Delta deal was found by Cheapflights users on 1/26. 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.
mar. 3/35:00 am
GEG
-
IAD
2 stops11h 09m
Delta
mer. 3/46:00 am
IAD
-
GEG
2 stops9h 35m
Delta
Deal found 1/26$268
This Delta deal was found by Cheapflights users on 1/27. 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.
mer. 2/2510:45 am
BOI
-
DCA
2 stops9h 15m
Delta
mer. 3/46:05 am
DCA
-
BOI
2 stops9h 54m
Delta
Deal found 1/27$268
This Delta deal was found by Cheapflights users on 1/26. 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.
mar. 3/35:00 am
GEG
-
DCA
2 stops10h 59m
Delta
mer. 3/46:05 am
DCA
-
GEG
2 stops9h 30m
Delta
Deal found 1/26$268

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 janvier 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$257
(Alaska Airlines)

One-way from

$111
(Frontier)

Popular in

January

Cheapest in

August

Average price

$1,006
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. 28% potential increase in price ($181 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 12% potential price decrease ($51 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 janvier 29, 2026.
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

BoiseWashington, D.C.

BOI - IAD

BOIIAD

Boise Air Term. Gowen Fld

sam. 3/7

1:51 pm-11:10 pm

1 stop7h 19m

Washington, D.C. Dulles Intl

sam. 3/14

7:00 am-1:05 pm

1 stop8h 05m

$257

BoiseWashington, D.C.

BOI - IAD

BOIIAD

Boise Air Term. Gowen Fld

mar. 2/24

6:28 am-5:20 pm

1 stop8h 52m

Washington, D.C. Dulles Intl

mar. 3/3

7:05 am-3:08 pm

1 stop10h 03m

$257

BoiseWashington, D.C.

BOI - IAD

BOIIAD

Boise Air Term. Gowen Fld

mer. 2/25

5:00 am-1:05 pm

1 stop6h 05m

Washington, D.C. Dulles Intl

mer. 3/4

2:36 pm-11:38 pm

1 stop11h 02m

$257

BoiseWashington, D.C.

BOI - IAD

BOIIAD

Boise Air Term. Gowen Fld

mar. 3/10

1:40 pm-12:27 am

1 stop8h 47m

Washington, D.C. Dulles Intl

sam. 3/14

7:00 am-4:00 pm

1 stop11h 00m

$257

SpokaneWashington, D.C.

GEG - IAD

GEGIAD

Spokane

mer. 2/25

5:00 am-3:44 pm

1 stop7h 44m

Washington, D.C. Dulles Intl

mer. 3/4

12:35 pm-9:07 pm

1 stop11h 32m

$257

SpokaneBaltimore

GEG - BWI

GEGBWI

Spokane

mer. 2/25

8:29 pm-5:46 pm

1 stop18h 17m

Baltimore/Washington

mer. 3/4

6:46 pm-11:59 pm

1 stop8h 13m

$257

SpokaneWashington, D.C.

GEG - IAD

GEGIAD

Spokane

mer. 2/18

11:22 am-11:10 pm

1 stop8h 48m

Washington, D.C. Dulles Intl

mer. 2/25

7:30 am-2:58 pm

1 stop10h 28m

$257

SpokaneWashington, D.C.

GEG - DCA

GEGDCA

Spokane

mer. 2/18

12:48 pm-11:32 pm

1 stop7h 44m

Washington, D.C. Reagan-National

mer. 2/25

4:44 pm-12:04 am

1 stop10h 20m

$257

BoiseBaltimore

BOI - BWI

BOIBWI

Boise Air Term. Gowen Fld

mer. 4/15

2:18 pm-12:38 am

1 stop8h 20m

Baltimore/Washington

sam. 4/18

7:00 am-1:07 pm

1 stop8h 07m

$257

SpokaneBaltimore

GEG - BWI

GEGBWI

Spokane

mer. 2/18

12:48 pm-12:35 am

1 stop8h 47m

Baltimore/Washington

mer. 2/25

6:00 am-11:35 am

1 stop8h 35m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

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 $369). 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.

How much does it cost to fly round-trip from Idaho to Washington, D.C.?

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 Delta, Alaska Airlines, and United Airlines fly from Idaho to Washington, D.C. in about 6h 05m. The time it takes to get you to your destination can typically vary by up to 2h 47m. There are 2019 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, Spokane - Baltimore/Washington or Spokane - Washington, D.C. Reagan-National 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 $369). 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
Silver Spring
Herndon
Fredericksburg
Hanover
Linthicum Heights
Rockville
Laurel
Towson
Manassas
Largo
Bowie
McLean
Clinton
Upper Marlboro

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 janvier 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$141Average$346FlexibilityNo cancel feeOn-time75%
DeltaCheapest$194Average$453FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$268Average$573FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$298Average$563FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$340Average$486FlexibilityNo cancel feeOn-time63%

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