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Washington, D.C.

$80+ 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 5/21. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — WAS
Apr 23 — Apr 301
Thu 4/23
Thu 4/30
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 March 24, 2026.

This Frontier deal was found by Cheapflights users on 3/21. 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 5/141:22 pm
BOI
-
DCA
1 stop6h 36m
Frontier
Sat 5/236:00 pm
DCA
-
BOI
1 stop20h 30m
Frontier
Deal found 3/21$162
This Frontier deal was found by Cheapflights users on 3/23. 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 4/2311:44 am
GEG
-
DCA
1 stop26h 15m
Frontier
Sat 5/26:00 pm
DCA
-
GEG
1 stop19h 49m
Frontier
Deal found 3/23$162
This Delta deal was found by Cheapflights users on 3/23. 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 5/2711:39 pm
BOI
-
IAD
1 stop7h 37m
Delta
Wed 6/37:00 am
IAD
-
BOI
1 stop9h 41m
Delta
Deal found 3/23$243
This Delta deal was found by Cheapflights users on 3/24. 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 4/1412:36 pm
GEG
-
IAD
1 stop9h 06m
Delta
Wed 4/157:20 am
IAD
-
GEG
1 stop7h 53m
Delta
Deal found 3/24$243
This Southwest deal was found by Cheapflights users on 3/22. 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.
Tue 4/217:00 am
GEG
-
IAD
2 stops13h 40m
Southwest
Tue 4/286:20 am
IAD
-
GEG
1 stop6h 55m
Southwest
Deal found 3/22$248
This Frontier deal was found by Cheapflights users on 3/23. 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.
Tue 5/121:22 pm
BOI
-
DCA
1 stop6h 36m
Frontier
Tue 5/197:00 am
DCA
-
BOI
1 stop7h 27m
Frontier
Deal found 3/23$250
This Southwest deal was found by Cheapflights users on 3/22. 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.
Tue 4/216:00 am
BOI
-
IAD
2 stops15h 40m
Southwest
Tue 4/285:30 pm
IAD
-
BOI
1 stop8h 00m
Southwest
Deal found 3/22$254
This Expedia deal was found by Cheapflights users on 3/18. 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 5/141:22 pm
BOI
-
DCA
1 stop6h 36m
Frontier
Tue 5/197:00 am
DCA
-
BOI
1 stop7h 27m
Frontier
Deal found 3/18$255
This Southwest deal was found by Cheapflights users on 3/23. 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.
Sat 5/910:45 am
GEG
-
IAD
1 stop9h 10m
Southwest
Wed 5/135:30 pm
IAD
-
GEG
1 stop8h 25m
Southwest
Deal found 3/23$257
This Delta deal was found by Cheapflights users on 3/24. 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 4/1412:36 pm
GEG
-
BWI
1 stop6h 54m
Delta
Wed 4/156:00 am
BWI
-
GEG
1 stop8h 41m
Delta
Deal found 3/24$257
This Southwest deal was found by Cheapflights users on 3/22. 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.
Tue 4/211:45 pm
GEG
-
BWI
1 stop7h 05m
Southwest
Tue 4/283:25 pm
BWI
-
GEG
1 stop11h 00m
Southwest
Deal found 3/22$258
This Southwest deal was found by Cheapflights users on 3/22. 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.
Tue 4/215:10 am
GEG
-
DCA
2 stops11h 00m
Southwest
Tue 4/284:40 pm
DCA
-
GEG
1 stop9h 45m
Southwest
Deal found 3/22$262

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 March 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$162
(Frontier)

One-way from

$80
(Frontier)

Popular in

December

Cheapest in

February

Average price

$425
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. 25% potential increase in price ($135 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 24, 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 - IAD

BOIIAD

Boise Air Term. Gowen Fld

Wed 4/29

6:08 pm-5:50 am

1 stop9h 42m

Washington, D.C. Dulles Intl

Sat 5/2

9:00 am-3:33 pm

1 stop8h 33m

$271

SpokaneWashington, D.C.

GEG - IAD

GEGIAD

Spokane

Sat 5/9

10:45 am-10:55 pm

1 stop9h 10m

Washington, D.C. Dulles Intl

Tue 5/12

5:30 pm-10:55 pm

1 stop8h 25m

$271

BoiseWashington, D.C.

BOI - DCA

BOIDCA

Boise Air Term. Gowen Fld

Sat 4/25

7:43 am-9:00 pm

1 stop11h 17m

Washington, D.C. Reagan-National

Wed 4/29

8:00 am-3:33 pm

1 stop9h 33m

$271

BoiseWashington, D.C.

BOI - DCA

BOIDCA

Boise Air Term. Gowen Fld

Sat 5/9

5:45 am-3:30 pm

1 stop7h 45m

Washington, D.C. Reagan-National

Wed 5/13

2:45 pm-11:46 pm

2 stops11h 01m

$276

BoiseWashington, D.C.

BOI - DCA

BOIDCA

Boise Air Term. Gowen Fld

Wed 4/22

2:18 pm-11:41 pm

1 stop7h 23m

Washington, D.C. Reagan-National

Sat 4/25

7:40 am-4:14 pm

2 stops10h 34m

$276

SpokaneWashington, D.C.

GEG - DCA

GEGDCA

Spokane

Sat 5/9

5:00 am-3:30 pm

1 stop7h 30m

Washington, D.C. Reagan-National

Tue 5/12

6:05 am-1:11 pm

2 stops10h 06m

$276

BoiseWashington, D.C.

BOI - IAD

BOIIAD

Boise Air Term. Gowen Fld

Tue 4/14

6:40 am-3:50 pm

1 stop7h 10m

Washington, D.C. Dulles Intl

Mon 4/20

4:30 pm-1:00 am

1 stop10h 30m

$302

BoiseWashington, D.C.

BOI - DCA

BOIDCA

Boise Air Term. Gowen Fld

Thu 4/23

3:23 pm-11:43 pm

1 stop6h 20m

Washington, D.C. Reagan-National

Wed 4/29

4:39 pm-12:17 am

1 stop9h 38m

$302

SpokaneWashington, D.C.

GEG - DCA

GEGDCA

Spokane

Fri 5/8

5:00 am-3:30 pm

1 stop7h 30m

Washington, D.C. Reagan-National

Tue 5/12

4:40 pm-11:59 pm

1 stop10h 19m

$307

SpokaneBaltimore

GEG - BWI

GEGBWI

Spokane

Thu 5/7

6:45 pm-5:45 am

1 stop8h 00m

Baltimore/Washington

Mon 5/11

6:00 am-11:17 am

1 stop8h 17m

$309

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/19

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, 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.

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 Alaska Airlines, Southwest, and Delta fly from Idaho to Washington, D.C. in about 7h 45m. The time it takes to get you to your destination can typically vary by up to 1h 57m. 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 $90 on Frontier. Other airlines that offer cheap prices include Delta from $125 and American Airlines from $185 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 Boise Air Term. Gowen Fld - Washington, D.C. Dulles Intl, Spokane - Washington, D.C. Dulles Intl or Spokane - 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 $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
Owings Mills
Arlington
Springfield
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
Fredericksburg
Largo
Bowie
Clinton
Towson
College Park
Cordova

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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Los Angeles to Reagan-National flights
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John F Kennedy Intl to Reagan-National flights
Hartford to Reagan-National flights
Hartford to Dulles Intl flights
Salt Lake City to Dulles Intl flights
Ontario to Reagan-National flights
San Diego to Reagan-National flights
LaGuardia to Dulles Intl flights
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Cincinnati to Reagan-National flights

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 March 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$141Average$453FlexibilityNo cancel feeOn-time75%
DeltaCheapest$194Average$469FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$278Average$555FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$300Average$675FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$336Average$488FlexibilityNo cancel feeOn-time63%

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