HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Idaho

$120+ Cheap flights from Washington, D.C. (WAS) to Idaho

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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — BOI
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington, D.C. to Idaho with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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

Keep the following information in mind while searching for Washington, D.C. to Idaho flight deals. Data was last updated September 15, 2025.

Round-trip from

$167
(Priceline)

One-way from

$120
(United Airlines)

Popular in

December

Cheapest in

April

Average price

$453
From Washington, D.C. (WAS) to Idaho
Search Deals
One-way flight from Washington, D.C. (WAS) to Idaho
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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

Cheapest flights from Washington, D.C. to Idaho
Explore the most affordable flight options available from Washington, D.C. to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Priceline deal was found by Cheapflights users on 9/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/287:00 amDCA - BOI
1 stop6h 37mFrontier
Thu 10/212:22 pmBOI - DCA
1 stop7h 37mFrontier
Deal found 9/13$167
This Southwest deal was found by Cheapflights users on 9/12. 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 10/216:15 amBWI - GEG
1 stop8h 50mSouthwest
Tue 10/2812:50 pmGEG - BWI
1 stop7h 30mSouthwest
Deal found 9/12$184
This Southwest deal was found by Cheapflights users on 9/12. 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.
Wed 11/124:35 pmDCA - GEG
1 stop8h 25mSouthwest
Sat 11/157:00 amGEG - DCA
1 stop9h 00mSouthwest
Deal found 9/12$197
This Southwest deal was found by Cheapflights users on 9/12. 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 10/186:35 amBWI - GEG
1 stop9h 50mSouthwest
Tue 10/2111:50 amGEG - BWI
1 stop14h 20mSouthwest
Deal found 9/12$203
This Southwest deal was found by Cheapflights users on 9/12. 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.
Wed 11/129:10 amBWI - GEG
1 stop15h 30mSouthwest
Sat 11/1512:50 pmGEG - BWI
1 stop13h 20mSouthwest
Deal found 9/12$208
This Delta deal was found by Cheapflights users on 9/12. 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 11/84:59 pmDCA - BOI
1 stop9h 09mDelta
Tue 11/115:17 amBOI - DCA
1 stop8h 08mDelta
Deal found 9/12$213
This American Airlines deal was found by Cheapflights users on 9/12. 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.
Thu 12/46:00 amIAD - BOI
1 stop8h 34mAmerican Airlines
Sat 1/101:43 pmBOI - IAD
1 stop6h 35mAmerican Airlines
Deal found 9/12$218
This Delta deal was found by Cheapflights users on 9/12. 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 10/44:59 pmDCA - GEG
1 stop9h 14mDelta
Tue 10/75:05 amGEG - DCA
1 stop7h 23mDelta
Deal found 9/12$221
This American Airlines deal was found by Cheapflights users on 9/12. 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.
Tue 10/216:11 amIAD - GEG
1 stop8h 32mAmerican Airlines
Tue 10/2812:33 pmGEG - IAD
1 stop7h 18mAmerican Airlines
Deal found 9/12$221
This Priceline deal was found by Cheapflights users on 9/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/287:00 amDCA - GEG
1 stop6h 58mFrontier
Thu 10/211:53 amGEG - DCA
1 stop7h 06mFrontier
Deal found 9/13$223
This Delta deal was found by Cheapflights users on 9/12. 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 10/216:15 amIAD - GEG
1 stop8h 46mDelta
Tue 10/2811:20 amGEG - IAD
2 stops9h 13mDelta
Deal found 9/12$226
This American Airlines deal was found by Cheapflights users on 9/12. 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.
Tue 10/216:11 amIAD - JAC
1 stop8h 32mAmerican Airlines
Tue 10/281:24 pmJAC - IAD
1 stop7h 27mAmerican Airlines
Deal found 9/12$249

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Idaho 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 September 15, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Idaho that are best for you.

Fly from

Washington, D.C.

Fly to

Idaho

Route

Depart

Return

Price

BaltimoreSpokane

BWI - GEG

BWIGEG

Baltimore/Washington

Tue 10/21

6:15 am-12:05 pm

1 stop8h 50m

Spokane

Tue 10/28

5:25 am-7:15 pm

2 stops10h 50m

$189

Washington, D.C.Spokane

DCA - GEG

DCAGEG

Washington, D.C. Reagan-National

Wed 11/12

4:35 pm-10:00 pm

1 stop8h 25m

Spokane

Sat 11/15

5:05 am-6:25 pm

2 stops10h 20m

$202

BaltimoreSpokane

BWI - GEG

BWIGEG

Baltimore/Washington

Sat 10/18

6:35 am-1:25 pm

1 stop9h 50m

Spokane

Tue 10/21

11:50 am-5:10 am

1 stop14h 20m

$203

Washington, D.C.Boise

DCA - BOI

DCABOI

Washington, D.C. Reagan-National

Sat 11/8

4:59 pm-12:08 am

1 stop9h 09m

Boise Air Term. Gowen Fld

Tue 11/11

5:17 am-3:25 pm

1 stop8h 08m

$213

Washington, D.C.Boise

IAD - BOI

IADBOI

Washington, D.C. Dulles Intl

Tue 3/3

7:00 am-1:07 pm

1 stop8h 07m

Boise Air Term. Gowen Fld

Wed 3/4

10:38 am-11:35 pm

2 stops10h 57m

$218

Washington, D.C.Spokane

IAD - GEG

IADGEG

Washington, D.C. Dulles Intl

Tue 10/21

6:11 am-11:43 am

1 stop8h 32m

Spokane

Tue 10/28

12:33 pm-10:51 pm

1 stop7h 18m

$221

Washington, D.C.Spokane

IAD - GEG

IADGEG

Washington, D.C. Dulles Intl

Wed 11/12

3:25 pm-11:29 pm

1 stop11h 04m

Spokane

Sat 11/15

1:47 pm-11:15 pm

1 stop6h 28m

$221

Washington, D.C.Spokane

DCA - GEG

DCAGEG

Washington, D.C. Reagan-National

Sat 10/4

4:59 pm-11:13 pm

1 stop9h 14m

Spokane

Tue 10/7

5:05 am-3:28 pm

1 stop7h 23m

$221

Washington, D.C.Spokane

IAD - GEG

IADGEG

Washington, D.C. Dulles Intl

Thu 10/23

7:35 am-2:57 pm

1 stop10h 22m

Spokane

Mon 10/27

12:51 pm-12:12 am

1 stop8h 21m

$221

Washington, D.C.Jackson

DCA - JAC

DCAJAC

Washington, D.C. Reagan-National

Tue 10/21

6:35 am-12:43 pm

1 stop8h 08m

Jackson Hole

Tue 10/28

1:24 pm-11:00 pm

1 stop7h 36m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Washington, D.C. to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from Washington, D.C. 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 Washington, D.C. to Idaho

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

Currently, October is the cheapest month in which you can book a flight from Washington, D.C. to Idaho (average of $314). Flying from Washington, D.C. to Idaho in June is currently the most expensive (average of $398). 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 WAS to ID?

Find hourly flight availability from Washington, D.C. to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

When flying from Washington, D.C. to Idaho, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated September 15, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Washington, D.C. to Idaho. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Delta
8.0
Very good
7,954 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,929 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Food

7.1

Overall

8.0

Boarding

8.1

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Idaho. 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 Washington, D.C. to Idaho?

    Southwest, Delta, and American Airlines can get you from Washington, D.C. to Idaho in just under 8h 32m. Your travel time can differ by up to 37m. Airlines will cover a distance of 2076 mi. This flight may include one or multiple stops.

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

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $120. American Airlines flights start at $125 while deals on Frontier start at $154 one-way.

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

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

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington, D.C. to Idaho 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 Washington, D.C. to Idaho?

    Currently, October is the cheapest month in which you can book a flight from Washington, D.C. to Idaho (average of $314). Flying from Washington, D.C. to Idaho in June is currently the most expensive (average of $398). 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

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 Washington, D.C. to Idaho

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Dallas/Fort Worth flights
Dulles Intl to Los Angeles flights
Reagan-National to Dallas/Fort Worth flights
Reagan-National to Los Angeles flights
Dulles Intl to Atlanta flights
Dulles Intl to Las Vegas flights
Dulles Intl to Orlando flights
Reagan-National to O'Hare Intl flights
Dulles Intl to Boston flights
Dulles Intl to O'Hare Intl flights
Reagan-National to Miami flights
Reagan-National to Orlando flights
Dulles Intl to Miami flights
Reagan-National to Boston flights
Reagan-National to Seattle flights
Reagan-National to Las Vegas flights
Dulles Intl to Seattle flights
Dulles Intl to Sky Harbor Intl flights
Reagan-National to San Francisco flights
Reagan-National to Atlanta flights
Reagan-National to Hobby flights
Dulles Intl to San Francisco flights
Dulles Intl to Detroit flights
Dulles Intl to Hobby flights
Dulles Intl to Tampa flights
Dulles Intl to New Orleans flights
Dulles Intl to Midway flights
Dulles Intl to Denver flights
Reagan-National to Fort Lauderdale flights
Dulles Intl to Austin flights
Dulles Intl to San Diego flights
Dulles Intl to Minneapolis flights
Reagan-National to Detroit flights
Reagan-National to Sky Harbor Intl flights
Dulles Intl to Charlotte flights
Reagan-National to Minneapolis flights
Reagan-National to Denver flights
Dulles Intl to George Bush Intcntl flights
Reagan-National to Nashville flights
Reagan-National to San Diego flights
Dulles Intl to Fort Lauderdale flights
Dulles Intl to Salt Lake City flights
Reagan-National to George Bush Intcntl flights
Reagan-National to Tampa flights
Dulles Intl to Honolulu flights
Dulles Intl to John F Kennedy Intl flights
Reagan-National to Austin flights
Reagan-National to Salt Lake City flights
Dulles Intl to Nashville flights
Reagan-National to New Orleans flights

Top 5 airlines flying from Washington, D.C. to Idaho

Discover the top 5 airlines that operate flights from Washington, D.C. to Idaho. 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$202Average$500FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$230Average$527FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$278Average$619FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$327Average$659FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$347Average$512FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.