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Dulles Intl

$241+ 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 10/28. Fares are subject to change and may not be available on all flights or dates of travel.
HLN — IAD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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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 September 11, 2025.

Round-trip from

$432
(Alaska Airlines)

One-way from

$241
(Hawaiian Airlines)

Popular in

November

Cheapest in

July

Average price

$822
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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Highest demand for flights based on searches. 27% potential increase in price ($254 potential increase over avg. RT price).
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Cheapest flight prices on average. 14% potential price decrease ($87 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 11, 2025.

This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/196:13 pmHLN - IAD
1 stop20h 27mAlaska Airlines
Fri 12/57:35 amIAD - HLN
1 stop12h 16mAlaska Airlines
Deal found 9/9$432
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Wed 10/222:44 pmHLN - IAD
1 stop6h 38mUnited Airlines
Mon 10/273:59 pmIAD - HLN
1 stop7h 23mUnited Airlines
Deal found 9/10$452
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/227:32 pmHLN - IAD
1 stop8h 46mAlaska Airlines
Fri 12/57:35 amIAD - HLN
1 stop12h 16mAlaska Airlines
Deal found 9/9$462
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/196:13 pmHLN - IAD
1 stop10h 10mAlaska Airlines
Wed 12/37:35 amIAD - HLN
1 stop12h 16mAlaska Airlines
Deal found 9/9$472
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/237:32 pmHLN - IAD
1 stop8h 46mAlaska Airlines
Fri 12/57:35 amIAD - HLN
1 stop12h 16mAlaska Airlines
Deal found 9/9$483
This Delta deal was found by Cheapflights users on 9/10. 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.
Thu 11/61:00 pmHLN - IAD
1 stop8h 33mDelta
Sun 11/97:10 amIAD - HLN
1 stop7h 16mDelta
Deal found 9/10$491
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Wed 12/106:30 amHLN - IAD
1 stop10h 38mUnited Airlines
Sat 12/1310:10 pmIAD - HLN
1 stop17h 37mUnited Airlines
Deal found 9/10$497
This Delta deal was found by Cheapflights users on 9/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/195:33 amHLN - IAD
2 stops11h 54mDelta
Wed 12/37:05 amIAD - HLN
1 stop7h 21mDelta
Deal found 9/9$502
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/196:13 pmHLN - IAD
1 stop10h 10mAlaska Airlines
Thu 12/47:35 amIAD - HLN
1 stop12h 16mAlaska Airlines
Deal found 9/9$503
This Delta deal was found by Cheapflights users on 9/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/205:33 amHLN - IAD
2 stops16h 45mDelta
Wed 12/37:05 amIAD - HLN
1 stop7h 21mDelta
Deal found 9/9$512
This United Airlines deal was found by Cheapflights users on 9/9. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/232:22 pmHLN - IAD
1 stop28h 59mUnited Airlines
Wed 12/310:10 pmIAD - HLN
1 stop17h 37mUnited Airlines
Deal found 9/9$513
This Delta deal was found by Cheapflights users on 9/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/195:33 amHLN - IAD
2 stops11h 54mDelta
Thu 12/47:05 amIAD - HLN
1 stop7h 21mDelta
Deal found 9/9$522

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 September 11, 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

Wed 11/19

6:13 pm-6:23 am

1 stop10h 10m

Washington, D.C. Dulles Intl

Wed 12/3

7:35 am-5:51 pm

1 stop12h 16m

$472

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 12/10

6:30 am-9:24 pm

1 stop12h 54m

Washington, D.C. Dulles Intl

Sat 12/13

10:10 pm-1:47 pm

1 stop17h 37m

$497

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 11/20

5:33 am-12:18 am

2 stops16h 45m

Washington, D.C. Dulles Intl

Wed 12/3

7:05 am-12:26 pm

1 stop7h 21m

$512

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 11/23

2:22 pm-9:21 pm

1 stop28h 59m

Washington, D.C. Dulles Intl

Wed 12/3

10:10 pm-1:47 pm

1 stop17h 37m

$513

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 11/6

1:00 pm-11:33 pm

1 stop8h 33m

Washington, D.C. Dulles Intl

Sun 11/9

7:10 am-12:26 pm

1 stop7h 16m

$525

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 11/23

2:22 pm-9:21 pm

1 stop28h 59m

Washington, D.C. Dulles Intl

Thu 12/4

10:10 pm-9:22 pm

1 stop25h 12m

$529

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 11/23

1:06 pm-4:23 pm

2 stops25h 17m

Washington, D.C. Dulles Intl

Thu 12/4

7:05 am-12:26 pm

1 stop7h 21m

$532

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 11/22

2:22 pm-11:33 am

2 stops19h 11m

Washington, D.C. Dulles Intl

Wed 12/3

10:10 pm-1:47 pm

1 stop17h 37m

$537

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 11/19

1:06 pm-11:29 pm

1 stop8h 23m

Washington, D.C. Dulles Intl

Fri 12/5

7:59 pm-10:30 pm

2 stops28h 31m

$538

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 11/21

1:06 pm-7:08 pm

2 stops28h 02m

Washington, D.C. Dulles Intl

Wed 12/3

7:05 am-12:26 pm

1 stop7h 21m

$538

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 20 results
1
2

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, August is the cheapest month in which you can book a flight from Helena to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Helena to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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.

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with United Airlines from Helena to Washington, D.C. Dulles Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Comfort

7.3

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

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 1 airline. 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, United Airlines, and Delta fly from Helena to Washington, D.C. Dulles Intl Airport in about 10h 10m. The time it takes to get you to your destination can typically vary by up to 6h 35m. Airlines will cover a distance of 1812 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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, August is the cheapest month in which you can book a flight from Helena to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Helena to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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
Woodbridge
Alexandria
Arlington
Tysons
Silver Spring
Springfield
Gaithersburg
Fredericksburg
Linthicum Heights
Fairfax
Falls Church
Owings Mills
Manassas
Rockville
Hanover
Oxon Hill
Laurel
Towson
Dundalk
National Harbor

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Helena to Dulles Intl

Discover the top airline that operate flights from Helena to Dulles Intl. 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 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$344Average$434FlexibilityNo cancel feeOn-time69%

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