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Cheap flights from Helena to Washington, D.C. from $239

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Helena to Washington, D.C. departing on 6/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
1:03 pm - 11:32 pm
HLN
-
IAD
8h 29m
1 stop
Delta Logo
7:30 am - 12:23 pm
IAD
-
HLN
6h 53m
1 stop
$273Delta
Thu, May 7 - Tue, May 12
Delta Logo
1:03 pm - 11:32 pm
HLN
-
IAD
8h 29m
1 stop
Delta Logo
10:11 am - 10:33 pm
IAD
-
HLN
14h 22m
2 stops
$360Delta
Thu, May 7 - Tue, May 12
Alaska Airlines Logo
6:22 pm - 5:50 am
HLN
-
IAD
9h 28m
1 stop
Alaska Airlines Logo
7:10 am - 5:45 pm
IAD
-
HLN
12h 35m
1 stop
$361Alaska Airlines
Thu, May 7 - Tue, May 12
Delta Logo
1:03 pm - 11:32 pm
HLN
-
IAD
8h 29m
1 stop
Delta Logo
7:30 am - 12:23 pm
IAD
-
HLN
6h 53m
1 stop
$369Delta
Thu, May 7 - Tue, May 12
Alaska Airlines Logo
6:22 pm - 5:50 am
HLN
-
IAD
9h 28m
1 stop
Alaska Airlines Logo
9:00 am - 5:45 pm
IAD
-
HLN
10h 45m
1 stop
$412Alaska Airlines
Thu, May 7 - Tue, May 12
Alaska Airlines Logo
6:22 pm - 5:40 am
HLN
-
IAD
9h 18m
1 stop
Alaska Airlines Logo
7:00 am - 5:45 pm
IAD
-
HLN
12h 45m
1 stop
$419Alaska Airlines
Fri, Apr 17 - Tue, Apr 21
Delta Logo
1:04 pm - 11:44 pm
HLN
-
IAD
8h 40m
1 stop
Delta Logo
10:11 am - 10:30 pm
IAD
-
HLN
14h 19m
2 stops
$424Delta
Fri, Apr 17 - Tue, Apr 21
Alaska Airlines Logo
6:22 pm - 5:50 am
HLN
-
IAD
9h 28m
1 stop
Alaska Airlines Logo
6:47 pm - 5:45 pm
IAD
-
HLN
24h 58m
2 stops
$441Alaska Airlines
Thu, Apr 30 - Mon, May 4
Alaska Airlines Logo
6:22 pm - 12:09 am
HLN
-
IAD
27h 47m
1 stop
Alaska Airlines Logo
9:00 am - 5:45 pm
IAD
-
HLN
10h 45m
1 stop
$452Alaska Airlines
Sat, Apr 25 - Wed, Apr 29
Alaska Airlines Logo
6:22 pm - 12:09 am
HLN
-
IAD
27h 47m
1 stop
Alaska Airlines Logo
9:00 am - 5:45 pm
IAD
-
HLN
10h 45m
1 stop
$456Alaska Airlines
Sat, Apr 25 - Wed, Apr 29

Alaska Airlines flights from Helena to Washington, D.C. Dulles Intl Airport

Our best Alaska Airlines deals on Helena to Washington, D.C. Dulles Intl Airport flight tickets
Alaska Airlines
May 7
HLN6:22 pmHelena
9h 28m
1 stop
IAD5:50 amWashington, D.C. Dulles Intl
May 12
IAD7:10 amWashington, D.C. Dulles Intl
12h 35m
1 stop
HLN5:45 pmHelena
$361
Alaska Airlines
Apr 30
HLN6:22 pmHelena
9h 28m
1 stop
IAD5:50 amWashington, D.C. Dulles Intl
May 4
IAD7:10 amWashington, D.C. Dulles Intl
12h 35m
1 stop
HLN5:45 pmHelena
$369
Alaska Airlines
May 7
HLN6:22 pmHelena
9h 28m
1 stop
IAD5:50 amWashington, D.C. Dulles Intl
May 12
IAD9:00 amWashington, D.C. Dulles Intl
10h 45m
1 stop
HLN5:45 pmHelena
$412

United Airlines flights from Helena to Washington, D.C. Dulles Intl Airport

Our best United Airlines deals on Helena to Washington, D.C. Dulles Intl Airport flight tickets
United Airlines
Apr 18
HLN2:25 pmHelena
7h 09m
1 stop
IAD11:34 pmWashington, D.C. Dulles Intl
Apr 24
IAD2:21 pmWashington, D.C. Dulles Intl
9h 12m
1 stop
HLN9:33 pmHelena
$487
United Airlines
Apr 25
HLN2:25 pmHelena
7h 09m
1 stop
IAD11:34 pmWashington, D.C. Dulles Intl
Apr 29
IAD8:20 amWashington, D.C. Dulles Intl
15h 13m
2 stops
HLN9:33 pmHelena
$512
United Airlines
Apr 25
HLN2:25 pmHelena
7h 09m
1 stop
IAD11:34 pmWashington, D.C. Dulles Intl
Apr 29
IAD8:30 amWashington, D.C. Dulles Intl
15h 03m
2 stops
HLN9:33 pmHelena
$545

momondo Fare Finder

 
Customize your flight search to find flights from Helena to Washington, D.C. Dulles Intl Airport 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, momondo users made 832,500 searches. Data last updated April 4, 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 5/7

1:03 pm-11:32 pm

1 stop8h 29m

Washington, D.C. Dulles Intl

Tue 5/12

7:30 am-12:23 pm

1 stop6h 53m

$273

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 5/7

1:03 pm-11:32 pm

1 stop8h 29m

Washington, D.C. Dulles Intl

Tue 5/12

10:11 am-10:33 pm

2 stops14h 22m

$360

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 5/7

6:22 pm-5:50 am

1 stop9h 28m

Washington, D.C. Dulles Intl

Tue 5/12

7:10 am-5:45 pm

1 stop12h 35m

$361

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 5/7

1:03 pm-11:32 pm

1 stop8h 29m

Washington, D.C. Dulles Intl

Tue 5/12

7:30 am-12:23 pm

1 stop6h 53m

$369

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 5/7

6:22 pm-5:50 am

1 stop9h 28m

Washington, D.C. Dulles Intl

Tue 5/12

9:00 am-5:45 pm

1 stop10h 45m

$412

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 4/17

6:22 pm-5:40 am

1 stop9h 18m

Washington, D.C. Dulles Intl

Tue 4/21

7:00 am-5:45 pm

1 stop12h 45m

$419

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 4/17

1:04 pm-11:44 pm

1 stop8h 40m

Washington, D.C. Dulles Intl

Tue 4/21

10:11 am-10:30 pm

2 stops14h 19m

$424

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 4/30

6:22 pm-5:50 am

1 stop9h 28m

Washington, D.C. Dulles Intl

Mon 5/4

6:47 pm-5:45 pm

2 stops24h 58m

$441

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 4/25

6:22 pm-12:09 am

1 stop27h 47m

Washington, D.C. Dulles Intl

Wed 4/29

9:00 am-5:45 pm

1 stop10h 45m

$452

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 4/25

6:22 pm-12:09 am

1 stop27h 47m

Washington, D.C. Dulles Intl

Wed 4/29

9:00 am-5:45 pm

1 stop10h 45m

$456

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Helena to Washington, D.C. Dulles Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Helena to Washington, D.C. Dulles Intl?

United Airlines, Alaska Airlines, and Delta are the most popular carriers operating from Helena to Washington, D.C. Dulles Intl

What airlines fly to Washington, D.C. Dulles Intl Airport?

United Airlines, Delta and Southwest are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from Helena according to our data. United Airlines is the first choice among our users, with 79% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 3 different airlines that fly to Washington, D.C. Dulles Intl Airport on a routine basis, so you have a few additional options to choose from.

When to book flights from Helena to Washington, D.C. Dulles Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Helena to Washington, D.C. Dulles Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Helena to Washington, D.C. Dulles Intl Airport (HLN to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Helena to Washington, D.C. Dulles Intl Airport

Fastest flight time

7h 09m

Direct flights

None
The fastest flight from Helena to Washington, D.C. Dulles Intl Airport takes 7h 09m
There are no direct flights from Helena to Washington, D.C. Dulles Intl Airport. There are no popular flight routes from Helena to Washington, D.C. Dulles Intl Airport.
Search flight deals

Frequently asked questions about flying from Helena to Washington, D.C. Dulles Intl Airport

  • How far is Helena to Washington, D.C. Dulles Intl by plane?

    Helena and Washington, D.C. Dulles Intl are 1814.3 mi apart from one another. By plane, this route typically takes 7h 09m.

  • When did momondo last update prices for flights from Helena Airport to Washington, D.C. Dulles Intl Airport?

    Prices for flights from Helena Airport to Washington, D.C. Dulles Intl Airport were last updated today.

  • How old do you have to be to fly from Helena Airport to Washington, D.C. Dulles Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Helena Airport to Washington, D.C. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The necessary travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
National Harbor
Gettysburg
Arlington
Winchester
Waldorf
Woodbridge
Laurel
Colonial Beach
Gaithersburg
Towson
Silver Spring
Fredericksburg
Rockville
Tysons
Manassas
Sterling
Linthicum Heights
Springfield
Bethesda

Why use momondo?

Why should I use momondo to find a flight deal from Helena to Washington, D.C.?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Helena to Washington, D.C. for you.

Can I find flights from Helena to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Washington, D.C. from Helena with this policy.

How can momondo help me find flights from Helena to Washington, D.C.?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington, D.C. from Helena.

I’m not ready to book a flight from Helena to Washington, D.C. right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Washington, D.C., momondo offers a useful price alert feature which will track prices for flights to Washington, D.C. from Helena and alert you when they change.

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