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Washington, D.C.

$101+ 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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — WAS
Sep 10 — Sep 171
Thu 9/10
Thu 9/17
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 August 11, 2026.

This Delta deal was found by Cheapflights users on 8/10. 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.
Sat 9/198:55 am -
1 stop9h 06m
Tue 9/227:25 am -
1 stop9h 51m
Deal found 8/10$201
This American Airlines deal was found by Cheapflights users on 8/10. 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.
Mon 8/3112:12 pm -
1 stop8h 46m
Wed 9/27:35 am -
1 stop8h 54m
Deal found 8/10$201
This American Airlines deal was found by Cheapflights users on 8/10. 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 9/212:12 pm -
1 stop7h 22m
Wed 9/93:57 pm -
1 stop8h 30m
Deal found 8/10$201
This Expedia deal was found by Cheapflights users on 8/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/312:24 pm -
1 stop7h 35m
Tue 9/87:00 am -
1 stop7h 29m
Deal found 8/6$204
This Frontier deal was found by Cheapflights users on 8/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2712:24 pm -
1 stop7h 35m
Sat 9/56:00 pm -
1 stop19h 29m
Deal found 8/6$205
This Southwest deal was found by Cheapflights users on 8/10. 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.
Mon 8/3112:10 pm -
1 stop9h 45m
Wed 9/24:50 pm -
2 stops8h 20m
Deal found 8/10$212
This Delta deal was found by Cheapflights users on 8/11. 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.
Wed 9/95:14 pm -
1 stop10h 04m
Wed 10/77:00 am -
1 stop8h 19m
Deal found 8/11$223
This Southwest deal was found by Cheapflights users on 8/9. 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.
Mon 11/910:05 am -
1 stop8h 20m
Wed 11/186:05 am -
1 stop9h 45m
Deal found 8/9$224
This Delta deal was found by Cheapflights users on 8/10. 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.
Wed 9/2312:17 pm -
1 stop8h 39m
Fri 9/256:47 pm -
1 stop7h 12m
Deal found 8/10$226
This Delta deal was found by Cheapflights users on 8/10. 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.
Wed 9/92:05 pm -
1 stop6h 18m
Sat 9/127:25 am -
1 stop10h 49m
Deal found 8/10$231
This Delta deal was found by Cheapflights users on 8/10. 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.
Mon 10/510:50 pm -
1 stop9h 36m
Wed 10/145:59 pm -
1 stop8h 45m
Deal found 8/10$231
This United Airlines deal was found by Cheapflights users on 8/10. 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 8/3112:24 pm -
1 stop6h 56m
Wed 9/25:15 pm -
1 stop7h 38m
Deal found 8/10$237

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 August 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$201
(Delta)

One-way from

$101
(Delta)

Popular in

July

Cheapest in

February

Average price

$397
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. 18% potential increase in price ($101 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 August 11, 2026.
Use the filters below to find and compare flights from Idaho to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseWashington, D.C.

BOI Boise Air Term. Gowen Fld - DCA Washington, D.C. Reagan-National

BOIDCA

Boise Air Term. Gowen Fld

Tue 9/8

3:19 pm-11:59 pm

1 stop6h 40m

Washington, D.C. Reagan-National

Tue 9/15

6:30 am-2:31 pm

1 stop10h 01m

$243

SpokaneBaltimore

GEG Spokane - BWI Baltimore/Washington

GEGBWI

Spokane

Tue 9/22

4:55 pm-6:35 am

1 stop10h 40m

Baltimore/Washington

Thu 9/24

10:20 am-3:35 pm

1 stop8h 15m

$247

SpokaneWashington, D.C.

GEG Spokane - IAD Washington, D.C. Dulles Intl

GEGIAD

Spokane

Tue 10/27

1:00 pm-12:42 am

1 stop8h 42m

Washington, D.C. Dulles Intl

Fri 10/30

7:23 am-12:15 pm

1 stop7h 52m

$262

BoiseWashington, D.C.

BOI Boise Air Term. Gowen Fld - IAD Washington, D.C. Dulles Intl

BOIIAD

Boise Air Term. Gowen Fld

Sun 10/4

11:10 pm-9:09 am

1 stop7h 59m

Washington, D.C. Dulles Intl

Thu 10/8

6:13 am-10:42 am

1 stop6h 29m

$276

BoiseWashington, D.C.

BOI Boise Air Term. Gowen Fld - IAD Washington, D.C. Dulles Intl

BOIIAD

Boise Air Term. Gowen Fld

Sat 1/23

2:43 pm-11:13 pm

1 stop6h 30m

Washington, D.C. Dulles Intl

Tue 1/26

12:45 pm-5:55 pm

1 stop7h 10m

$303

BoiseBaltimore

BOI Boise Air Term. Gowen Fld - BWI Baltimore/Washington

BOIBWI

Boise Air Term. Gowen Fld

Tue 11/17

5:00 am-3:13 pm

1 stop8h 13m

Baltimore/Washington

Wed 11/18

8:00 am-4:42 pm

1 stop10h 42m

$303

BoiseBaltimore

BOI Boise Air Term. Gowen Fld - BWI Baltimore/Washington

BOIBWI

Boise Air Term. Gowen Fld

Tue 10/27

2:25 pm-12:15 am

1 stop7h 50m

Baltimore/Washington

Mon 11/2

6:40 pm-12:50 am

1 stop8h 10m

$303

BoiseWashington, D.C.

BOI Boise Air Term. Gowen Fld - IAD Washington, D.C. Dulles Intl

BOIIAD

Boise Air Term. Gowen Fld

Tue 10/27

1:40 pm-12:42 am

1 stop9h 02m

Washington, D.C. Dulles Intl

Mon 11/2

7:05 am-3:20 pm

1 stop10h 15m

$303

BoiseWashington, D.C.

BOI Boise Air Term. Gowen Fld - IAD Washington, D.C. Dulles Intl

BOIIAD

Boise Air Term. Gowen Fld

Thu 2/4

5:40 am-1:48 pm

1 stop6h 08m

Washington, D.C. Dulles Intl

Wed 2/10

7:05 am-3:30 pm

1 stop10h 25m

$303

BoiseWashington, D.C.

BOI Boise Air Term. Gowen Fld - IAD Washington, D.C. Dulles Intl

BOIIAD

Boise Air Term. Gowen Fld

Thu 10/22

11:10 pm-9:19 am

1 stop8h 09m

Washington, D.C. Dulles Intl

Mon 10/26

7:05 am-3:20 pm

1 stop10h 15m

$303

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/10

Showing 1-10 of 60 resultsSorted by cheapest first
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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, February is the cheapest month in which you can book a flight from Idaho to Washington, D.C. (average of $401). Flying from Idaho to Washington, D.C. in December is currently the most expensive (average of $584). 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.?

Airfare is below average for this route at the moment.
Idaho to Washington, D.C. flights typically cost between $296 and $440 in September.
The cheapest round-trip price found within the last 5 days was $201 on Delta (Sep 19-Sep 26).

How far ahead should I book a flight from Idaho to Washington, D.C.?

Booking 70 days in advance of your planned departure date is, on average, the best time to get cheap flights from Idaho to Washington, D.C.. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 American Airlines, Southwest, and Delta fly from Idaho to Washington, D.C. in about 6h 40m. The time it takes to get you to your destination can typically vary by up to 4h. There are 2042 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 $80 on Frontier. Other airlines that offer cheap prices include Delta from $125 and American Airlines from $131 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 - 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, February is the cheapest month in which you can book a flight from Idaho to Washington, D.C. (average of $401). Flying from Idaho to Washington, D.C. in December is currently the most expensive (average of $584). 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
Owings Mills
Arlington
Tysons
Springfield
Lanham
Reston
Herndon
Rockville
Hyattsville
Fredericksburg
Falls Church
Hanover
Laurel
Oxon Hill
Clinton
Hunt Valley
Woodbridge
Silver Spring
Largo

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 August 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$176Average$395FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$245Average$460FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$277Average$678FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$278Average$578FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$335Average$492FlexibilityNo cancel feeOn-time63%

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