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Idaho Falls

$198+ Cheap flights from Washington, D.C. (WAS) to Idaho Falls (IDA)

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 2/1. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — IDA
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
1 adult, Economy
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Cheap flight deals from Washington, D.C. to Idaho Falls

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Idaho Falls (IDA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 18, 2025.

Round-trip from

$395
(Delta)

One-way from

$198
(American Airlines)

Popular in

November

Cheapest in

January

Average price

$831
From Washington, D.C. (WAS) to Idaho Falls Fanning Field
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One-way flight from Washington, D.C. (WAS) to Idaho Falls Fanning Field
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Highest demand for flights based on searches. 11% potential increase in price ($89 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($18 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Washington, D.C. to Idaho Falls

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

This Delta deal was found by Cheapflights users on 8/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/245:00 pmDCA - IDA
1 stop7h 20mDelta
Fri 11/286:05 amIDA - DCA
1 stop8h 14mDelta
Deal found 8/17$395
This Delta deal was found by Cheapflights users on 8/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:15 amBWI - IDA
1 stop7h 11mDelta
Wed 10/86:53 pmIDA - BWI
1 stop9h 07mDelta
Deal found 8/17$430
This American Airlines deal was found by Cheapflights users on 8/17. 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.
Thu 10/168:25 pmIAD - IDA
2 stops18h 16mAmerican Airlines
Mon 10/201:11 pmIDA - IAD
2 stops18h 44mAmerican Airlines
Deal found 8/17$432
This Delta deal was found by Cheapflights users on 8/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2412:00 pmBWI - IDA
2 stops8h 14mDelta
Fri 11/281:05 pmIDA - BWI
1 stop8h 52mDelta
Deal found 8/17$435
This flugladen.de deal was found by Cheapflights users on 8/17. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:00 amIAD - IDA
1 stop10h 20mMultiple Airlines
Wed 10/86:00 amIDA - IAD
1 stop10h 28mMultiple Airlines
Deal found 8/17$444
This Alaska Airlines deal was found by Cheapflights users on 8/16. 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.
Thu 10/166:25 amIAD - IDA
1 stop11h 13mAlaska Airlines
Mon 10/204:15 pmIDA - IAD
1 stop13h 18mAlaska Airlines
Deal found 8/16$457
This Mytrip deal was found by Cheapflights users on 8/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/296:30 amBWI - IDA
1 stop11h 29mMultiple Airlines
Mon 9/16:33 pmIDA - BWI
3 stops26h 35mMultiple Airlines
Deal found 8/15$458
This Kiwi.com deal was found by Cheapflights users on 8/15. 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.
Tue 12/28:25 pmBWI - IDA
1 stop17h 04mMultiple Airlines
Fri 12/128:16 pmIDA - BWI
1 stop9h 07mMultiple Airlines
Deal found 8/15$459
This United Airlines deal was found by Cheapflights users on 8/17. 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.
Mon 9/110:10 amBWI - IDA
1 stop7h 19mUnited Airlines
Fri 9/55:00 amIDA - BWI
1 stop8h 14mUnited Airlines
Deal found 8/17$461
This United Airlines deal was found by Cheapflights users on 8/17. 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.
Mon 11/245:18 pmIAD - IDA
1 stop7h 34mUnited Airlines
Fri 11/2810:50 amIDA - IAD
1 stop8h 31mUnited Airlines
Deal found 8/17$477
This American Airlines deal was found by Cheapflights users on 8/17. 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.
Mon 9/15:02 amBWI - IDA
2 stops9h 14mAmerican Airlines
Fri 9/56:44 amIDA - BWI
2 stops14h 18mAmerican Airlines
Deal found 8/17$496
This American Airlines deal was found by Cheapflights users on 8/16. 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.
Sat 9/206:30 amDCA - IDA
1 stop7h 54mAmerican Airlines
Thu 9/2512:41 pmIDA - DCA
1 stop8h 45mAmerican Airlines
Deal found 8/16$501

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to Idaho Falls 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 18, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Idaho Falls that are best for you.

Fly from

Washington, D.C.

Fly to

Idaho Falls

Route

Depart

Return

Price

Washington, D.C.Idaho Falls

DCA - IDA

DCAIDA

Washington, D.C. Reagan-National

Mon 11/24

5:00 pm-10:20 pm

1 stop7h 20m

Idaho Falls Fanning Field

Fri 11/28

6:05 am-4:19 pm

1 stop8h 14m

$395

BaltimoreIdaho Falls

BWI - IDA

BWIIDA

Baltimore/Washington

Wed 10/1

7:15 am-12:26 pm

1 stop7h 11m

Idaho Falls Fanning Field

Wed 10/8

6:53 pm-6:00 am

1 stop9h 07m

$430

Washington, D.C.Idaho Falls

IAD - IDA

IADIDA

Washington, D.C. Dulles Intl

Thu 10/16

8:25 pm-12:41 pm

2 stops18h 16m

Idaho Falls Fanning Field

Mon 10/20

1:11 pm-9:55 am

2 stops18h 44m

$432

BaltimoreIdaho Falls

BWI - IDA

BWIIDA

Baltimore/Washington

Mon 11/24

12:00 pm-6:14 pm

2 stops8h 14m

Idaho Falls Fanning Field

Fri 11/28

1:05 pm-11:57 pm

1 stop8h 52m

$435

Washington, D.C.Idaho Falls

IAD - IDA

IADIDA

Washington, D.C. Dulles Intl

Wed 10/1

7:00 am-3:20 pm

1 stop10h 20m

Idaho Falls Fanning Field

Wed 10/8

6:00 am-6:28 pm

1 stop10h 28m

$444

Washington, D.C.Idaho Falls

IAD - IDA

IADIDA

Washington, D.C. Dulles Intl

Thu 10/16

6:25 am-3:38 pm

1 stop11h 13m

Idaho Falls Fanning Field

Mon 10/20

4:15 pm-7:33 am

1 stop13h 18m

$457

BaltimoreIdaho Falls

BWI - IDA

BWIIDA

Baltimore/Washington

Fri 8/29

6:30 am-3:59 pm

1 stop11h 29m

Idaho Falls Fanning Field

Mon 9/1

6:33 pm-11:08 pm

3 stops26h 35m

$458

BaltimoreIdaho Falls

BWI - IDA

BWIIDA

Baltimore/Washington

Tue 12/2

8:25 pm-11:29 am

1 stop17h 04m

Idaho Falls Fanning Field

Fri 12/12

8:16 pm-7:23 am

1 stop9h 07m

$459

BaltimoreIdaho Falls

BWI - IDA

BWIIDA

Baltimore/Washington

Mon 9/1

10:10 am-3:29 pm

1 stop7h 19m

Idaho Falls Fanning Field

Fri 9/5

5:00 am-3:14 pm

1 stop8h 14m

$461

Washington, D.C.Idaho Falls

IAD - IDA

IADIDA

Washington, D.C. Dulles Intl

Mon 11/24

5:18 pm-10:52 pm

1 stop7h 34m

Idaho Falls Fanning Field

Fri 11/28

10:50 am-9:21 pm

1 stop8h 31m

$477

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/15

Showing 1-10 of 41 results
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Best time to book a flight from Washington, D.C. to Idaho Falls

Have a flexible travel schedule? Discover the best time to fly to Idaho Falls 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 Falls

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

Currently, October is the cheapest month in which you can book a flight from Washington, D.C. to Idaho Falls (average of $380). Flying from Washington, D.C. to Idaho Falls in December is currently the most expensive (average of $578). 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 IDA?

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

A simple way to save on the total cost of your ticket is to fly from Washington, D.C. to Idaho Falls in the morning. If you’re flexible enough to do this you can expect to save up to 6% on your trip compared to booking a flight at noon.

Reviews of airlines servicing Idaho Falls

Get insights into the airlines that provide service to Idaho Falls. 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 Falls. Reviews last updated August 18, 2025.
Read through reviews of airlines operating flights from Washington, D.C. to Idaho Falls, such as Alaska Airlines, Delta, and United Airlines. 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

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Delta
8.0
Very good
7,981 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
United Airlines
7.4
Good
8,925 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Overall

8.0

Boarding

8.1

Entertainment

7.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

Related info for your journey

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

  • What airport do you fly into for flights to Idaho Falls from Washington, D.C.?

    Located just 3.8 mi from the city center, Idaho Falls Fanning Field is the airport most travelers will use when flying to Idaho Falls from Washington, D.C.. Booking flights from Washington, D.C. to Fanning Field (IDA) should be relatively easy as there are 0 daily inbound flights from Washington, D.C. from 3 different airlines.

  • What are the cheapest airlines flying from Washington, D.C. to Idaho Falls round-trip?

    United Airlines, at $408, was found to be the cheapest airline from Washington, D.C. to Idaho Falls. An alternate airline flying to your destination would be American Airlines. United Airlines is currently priced 38% below the average price you’ll pay for this route.

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

    The cheapest airlines for a one-way flight from Washington, D.C. to Idaho Falls are American Airlines ($198), Allegiant Air ($218), and Delta ($235).

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

    When deciding which route to take from Washington, D.C. to Idaho Falls consider Washington, D.C. Dulles Intl - Idaho Falls Fanning Field, Washington, D.C. Reagan-National - Idaho Falls Fanning Field or Baltimore/Washington - Idaho Falls Fanning Field as they are the most popular.

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

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

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

    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 Falls.

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

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

    Currently, October is the cheapest month in which you can book a flight from Washington, D.C. to Idaho Falls (average of $380). Flying from Washington, D.C. to Idaho Falls in December is currently the most expensive (average of $578). 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 Idaho Falls?

Book flights to Idaho Falls if you plan to visit one of these locations
Rexburg

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Top 3 airlines flying from Washington, D.C. to Idaho Falls

Discover the top 3 airlines that operate flights from Washington, D.C. to Idaho Falls. 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 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$334Average$721FlexibilityNo cancel feeOn-time71%
DeltaCheapest$334Average$489FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$408Average$698FlexibilityNo cancel feeOn-time69%

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