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Cheap flights from Helena to Washington, D.C. from $260

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 6/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
4:48 pm - 5:40 am
HLN
-
IAD
10h 52m
1 stop
Alaska Airlines Logo
9:35 am - 4:11 pm
IAD
-
HLN
8h 36m
1 stop
$349Alaska Airlines
Sat, Oct 24 - Tue, Oct 27
United Airlines Logo
2:20 pm - 12:45 am
HLN
-
IAD
8h 25m
1 stop
United Airlines Logo
2:35 pm - 9:20 pm
IAD
-
HLN
8h 45m
1 stop
$419United Airlines
Fri, Jun 5 - Tue, Jun 9
United Airlines Logo
2:20 pm - 12:45 am
HLN
-
IAD
8h 25m
1 stop
United Airlines Logo
6:30 am - 1:33 pm
IAD
-
HLN
9h 03m
1 stop
$474United Airlines
Thu, Jun 4 - Wed, Jun 10
Alaska Airlines Logo
5:18 pm - 5:40 am
HLN
-
IAD
10h 22m
1 stop
Alaska Airlines Logo
7:47 pm - 4:41 pm
IAD
-
HLN
22h 54m
2 stops
$475Alaska Airlines
Thu, Sep 17 - Mon, Sep 21
Alaska Airlines Logo
5:09 pm - 6:39 am
HLN
-
IAD
11h 30m
1 stop
Alaska Airlines Logo
6:14 pm - 4:32 pm
IAD
-
HLN
24h 18m
1 stop
$509Alaska Airlines
Fri, Jul 24 - Mon, Jul 27
Alaska Airlines Logo
5:09 pm - 6:39 am
HLN
-
IAD
11h 30m
1 stop
Alaska Airlines Logo
7:53 pm - 4:32 pm
IAD
-
HLN
22h 39m
2 stops
$525Alaska Airlines
Fri, Jul 24 - Mon, Jul 27
United Airlines Logo
2:35 pm - 11:19 pm
HLN
-
IAD
6h 44m
1 stop
United Airlines Logo
8:15 am - 8:59 pm
IAD
-
HLN
14h 44m
2 stops
$542United Airlines
Sat, Oct 24 - Tue, Oct 27
Delta Logo
1:03 pm - 11:32 pm
HLN
-
IAD
8h 29m
1 stop
Delta Logo
12:29 pm - 10:31 pm
IAD
-
HLN
12h 02m
2 stops
$544Delta
Fri, Jun 5 - Tue, Jun 9
Alaska Airlines Logo
5:18 pm - 6:14 pm
HLN
-
IAD
22h 56m
2 stops
Alaska Airlines Logo
7:47 pm - 4:41 pm
IAD
-
HLN
22h 54m
2 stops
$601Alaska Airlines
Thu, Sep 17 - Mon, Sep 21
Delta Logo
1:03 pm - 12:51 am
HLN
-
IAD
9h 48m
2 stops
Delta Logo
12:29 pm - 10:31 pm
IAD
-
HLN
12h 02m
2 stops
$629Delta
Fri, Jun 5 - Tue, Jun 9

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
Oct 24
HLN4:48 pmHelena
10h 52m
1 stop
IAD5:40 amWashington, D.C. Dulles Intl
Oct 27
IAD9:35 amWashington, D.C. Dulles Intl
8h 36m
1 stop
HLN4:11 pmHelena
$349
Alaska Airlines
Sep 17
HLN5:18 pmHelena
10h 22m
1 stop
IAD5:40 amWashington, D.C. Dulles Intl
Sep 21
IAD7:47 pmWashington, D.C. Dulles Intl
22h 54m
2 stops
HLN4:41 pmHelena
$475
Alaska Airlines
Jul 24
HLN5:09 pmHelena
11h 30m
1 stop
IAD6:39 amWashington, D.C. Dulles Intl
Jul 27
IAD6:14 pmWashington, D.C. Dulles Intl
24h 18m
1 stop
HLN4:32 pmHelena
$509

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

Our best Delta deals on Helena to Washington, D.C. Dulles Intl Airport flight tickets
Delta
May 28
HLN1:03 pmHelena
8h 29m
1 stop
IAD11:32 pmWashington, D.C. Dulles Intl
Jun 1
IAD12:40 pmWashington, D.C. Dulles Intl
11h 53m
2 stops
HLN10:33 pmHelena
$514
Delta
Jun 5
HLN1:03 pmHelena
8h 29m
1 stop
IAD11:32 pmWashington, D.C. Dulles Intl
Jun 9
IAD12:29 pmWashington, D.C. Dulles Intl
12h 02m
2 stops
HLN10:31 pmHelena
$544
Delta
May 28
HLN1:03 pmHelena
8h 29m
1 stop
IAD11:32 pmWashington, D.C. Dulles Intl
Jun 1
IAD1:11 pmWashington, D.C. Dulles Intl
11h 22m
2 stops
HLN10:33 pmHelena
$549

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 May 23, 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

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 10/24

4:48 pm-5:40 am

1 stop10h 52m

Washington, D.C. Dulles Intl

Tue 10/27

9:35 am-4:11 pm

1 stop8h 36m

$349
Quickest round-trip

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 6/5

2:20 pm-12:45 am

1 stop8h 25m

Washington, D.C. Dulles Intl

Tue 6/9

2:35 pm-9:20 pm

1 stop8h 45m

$419

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 6/4

2:20 pm-12:45 am

1 stop8h 25m

Washington, D.C. Dulles Intl

Wed 6/10

6:30 am-1:33 pm

1 stop9h 03m

$474

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 9/17

5:18 pm-5:40 am

1 stop10h 22m

Washington, D.C. Dulles Intl

Mon 9/21

7:47 pm-4:41 pm

2 stops22h 54m

$475

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 7/24

5:09 pm-6:39 am

1 stop11h 30m

Washington, D.C. Dulles Intl

Mon 7/27

6:14 pm-4:32 pm

1 stop24h 18m

$509

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 7/24

5:09 pm-6:39 am

1 stop11h 30m

Washington, D.C. Dulles Intl

Mon 7/27

7:53 pm-4:32 pm

2 stops22h 39m

$525

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 10/24

2:35 pm-11:19 pm

1 stop6h 44m

Washington, D.C. Dulles Intl

Tue 10/27

8:15 am-8:59 pm

2 stops14h 44m

$542

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 6/5

1:03 pm-11:32 pm

1 stop8h 29m

Washington, D.C. Dulles Intl

Tue 6/9

12:29 pm-10:31 pm

2 stops12h 02m

$544

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 9/17

5:18 pm-6:14 pm

2 stops22h 56m

Washington, D.C. Dulles Intl

Mon 9/21

7:47 pm-4:41 pm

2 stops22h 54m

$601

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Fri 6/5

1:03 pm-12:51 am

2 stops9h 48m

Washington, D.C. Dulles Intl

Tue 6/9

12:29 pm-10:31 pm

2 stops12h 02m

$629

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 is the most popular carrier operating from Helena to Washington, D.C. Dulles Intl

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

United Airlines, Alaska Airlines 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 70% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 4 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

6h 44m

Direct flights

None
The fastest flight from Helena to Washington, D.C. Dulles Intl Airport takes 6h 44m
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 6h 44m.

  • 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
Gaithersburg
Colonial Beach
Fredericksburg
Silver Spring
Towson
Rockville
Sterling
Manassas
Linthicum Heights
Tysons
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.

An easier way to manage your Washington, D.C. Dulles Intl Airport trip

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