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Dulles Intl

$268+ Cheap flights from Helena (HLN) to Dulles Intl (IAD)

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 1/4. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — IAD
Dec 18 — Dec 251
Thu 12/18
Thu 12/25
1 adult, Economy
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Find flight deals from Helena to Dulles Intl

Cheapest flights from Helena to Dulles Intl
Explore the most affordable flight options available from Helena to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 18, 2025.

This Delta deal was found by Cheapflights users on 11/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/101:06 pmHLN - IAD
1 stop8h 23mDelta
Sat 12/137:05 amIAD - HLN
1 stop7h 20mDelta
Deal found 11/16$389
This Alaska Airlines deal was found by Cheapflights users on 11/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:28 pmHLN - IAD
1 stop20h 08mAlaska Airlines
Sun 1/116:04 pmIAD - HLN
1 stop26h 07mAlaska Airlines
Deal found 11/17$459
This Delta deal was found by Cheapflights users on 11/17. 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.
Thu 12/111:06 pmHLN - IAD
1 stop8h 23mDelta
Mon 12/157:05 amIAD - HLN
1 stop7h 20mDelta
Deal found 11/17$493
This United Airlines deal was found by Cheapflights users on 11/17. 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.
Fri 12/192:26 pmHLN - IAD
1 stop6h 57mUnited Airlines
Thu 12/258:20 amIAD - HLN
1 stop7h 25mUnited Airlines
Deal found 11/17$606
This Alaska Airlines deal was found by Cheapflights users on 11/16. 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.
Tue 12/306:32 pmHLN - IAD
1 stop9h 41mAlaska Airlines
Sun 1/116:04 pmIAD - HLN
1 stop26h 07mAlaska Airlines
Deal found 11/16$608

Cheap flight deals from Helena to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Helena (HLN) to Dulles Intl (IAD). 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 November 18, 2025.

Most accurate provider

Expedia
2 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$374
(Alaska Airlines)

One-way from

$268
(Alaska Airlines)
Provider with most accurate pricing for Helena-Washington, D.C. Dulles Intl flight deals.
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Provider most trusted by Cheapflights users for Helena-Washington, D.C. Dulles Intl flights.
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From Helena to Washington, D.C. Dulles Intl
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One-way flight from Helena to Washington, D.C. Dulles Intl
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Helena to Dulles Intl 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 November 18, 2025.
Use the filters below to find and compare flights from Helena to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Helena

Fly to

Dulles Intl

Route

Depart

Return

Price

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 2/19

4:36 pm-5:40 am

1 stop11h 04m

Washington, D.C. Dulles Intl

Mon 2/23

6:27 pm-3:59 pm

1 stop23h 32m

$374

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 12/10

1:06 pm-11:29 pm

1 stop8h 23m

Washington, D.C. Dulles Intl

Sat 12/13

7:05 am-12:25 pm

1 stop7h 20m

$389

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 12/11

1:06 pm-11:29 pm

1 stop8h 23m

Washington, D.C. Dulles Intl

Mon 12/15

7:05 am-12:25 pm

1 stop7h 20m

$493

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 12/19

2:26 pm-11:23 pm

1 stop6h 57m

Washington, D.C. Dulles Intl

Thu 12/25

6:20 am-1:45 pm

1 stop9h 25m

$606

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 1/4

6:32 pm-6:13 am

1 stop9h 41m

$268

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 12/19

1:06 pm-11:29 pm

1 stop8h 23m

$269

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 12/20

2:26 pm-11:23 pm

1 stop6h 57m

$305

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 1/3

6:32 pm-6:13 am

1 stop9h 41m

$431

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Mon 12/29

6:10 am-5:19 am

1 stop21h 09m

$468

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 11/29

1:06 pm-11:58 pm

1 stop8h 52m

$504

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/16

Showing 1-10 of 13 results
1
2
  • Most accurate provider: When it comes to deals on Helena-Washington, D.C. Dulles Intl Airport flights, users find the pricing of Expedia to be most consistent on Cheapflights vs. Expedia Users can find the same prices on Helena-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. Expedia 90-95% of the time. Price accuracy is based on data collected from Helena-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Helena-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Helena-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Helena to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Helena 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 Helena to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Helena to Washington, D.C. Dulles Intl Airport?

Currently, November is the cheapest month in which you can book a flight from Helena to Washington, D.C. Dulles Intl Airport (average of $230). Flying from Helena to Washington, D.C. Dulles Intl Airport in February is currently the most expensive (average of $461). 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 Helena to Dulles Intl. 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 from for flights from Helena to Washington, D.C. Dulles Intl?

    Most people fly from Helena (HLN) if they book a flight from Helena to Washington, D.C. Dulles Intl. On average, Helena has 0 outbound flights to Washington, D.C. Dulles Intl per day from 0 airlines. Helena is conveniently located just 2.7 mi from Helena’s city center.

  • How long is the flight from Helena to Washington, D.C. Dulles Intl Airport?

    Airlines like Alaska Airlines and Delta fly from Helena to Washington, D.C. Dulles Intl Airport in about 8h 23m. The time it takes to get you to your destination can typically vary by up to 2h 41m. Airlines will cover a distance of 1812 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Helena to Washington, D.C. Dulles Intl Airport one-way?

    For one-way options, check prices for Alaska Airlines. According to our data, you can fly for as low as $268. Users have also found prices from $269 and $305 on Delta and United Airlines, respectively.

  • Can I find deals for flights from Helena to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Helena to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Helena to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Helena to Dulles Intl.

  • Can I find deals for business class flights from Helena to Dulles Intl?

    Yes. Cheapflights offers flight deals from Helena to Dulles Intl 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 Helena to Washington, D.C. Dulles Intl Airport?

    Currently, November is the cheapest month in which you can book a flight from Helena to Washington, D.C. Dulles Intl Airport (average of $230). Flying from Helena to Washington, D.C. Dulles Intl Airport in February is currently the most expensive (average of $461). 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. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Tysons
Woodbridge
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fairfax
Fredericksburg
Falls Church
Linthicum Heights
Manassas
Laurel
Towson
National Harbor
Waldorf
Bowie
Largo
McLean

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