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Cheap flights from Helena to Washington, D.C. from $218

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 12/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

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Alaska Airlines Logo
6:28 pm - 4:36 pmHLN-IAD
20h 08m1 stop
Alaska Airlines Logo
7:34 am - 5:51 pmIAD-HLN
12h 17m1 stop
$324Alaska Airlines
Find Deal
Wed, Dec 10 - Sat, Dec 13
Alaska Airlines Logo
6:28 pm - 4:36 pmHLN-IAD
20h 08m1 stop
Alaska Airlines Logo
7:34 am - 5:51 pmIAD-HLN
12h 17m1 stop
$382Alaska Airlines
Find Deal
Wed, Dec 10 - Sat, Dec 13
Alaska Airlines Logo
5:59 pm - 5:04 pmHLN-IAD
21h 05m2 stops
Alaska Airlines Logo
6:04 pm - 5:22 pmIAD-HLN
25h 18m1 stop
$429Alaska Airlines
Find Deal
Sun, Jan 11 - Wed, Jan 14
Delta Logo
1:06 pm - 11:27 pmHLN-IAD
32h 21m2 stops
Delta Logo
7:05 am - 12:25 pmIAD-HLN
7h 20m1 stop
$432Delta
Find Deal
Wed, Dec 10 - Sat, Dec 13
Delta Logo
1:06 pm - 11:27 pmHLN-IAD
32h 21m2 stops
Delta Logo
7:05 am - 12:25 pmIAD-HLN
7h 20m1 stop
$451Delta
Find Deal
Wed, Dec 10 - Sat, Dec 13
Delta Logo
1:06 pm - 11:27 pmHLN-IAD
32h 21m2 stops
Delta Logo
7:15 am - 12:25 pmIAD-HLN
31h 10m2 stops
$455Delta
Find Deal
Wed, Dec 10 - Sat, Dec 13
Alaska Airlines Logo
5:59 pm - 4:26 pmHLN-IAD
20h 27m1 stop
Alaska Airlines Logo
5:26 pm - 5:22 pmIAD-HLN
25h 56m2 stops
$494Alaska Airlines
Find Deal
Mon, Jan 12 - Thu, Jan 15
United Airlines Logo
6:15 am - 4:35 pmHLN-IAD
8h 20m1 stop
United Airlines Logo
4:11 pm - 9:26 pmIAD-HLN
7h 15m1 stop
$508United Airlines
Find Deal
Sun, Jan 11 - Wed, Jan 14
United Airlines Logo
6:40 am - 5:16 amHLN-IAD
20h 36m1 stop
United Airlines Logo
5:30 pm - 9:22 pmIAD-HLN
29h 52m2 stops
$681United Airlines
Find Deal
Tue, Nov 18 - Sat, Nov 22
United Airlines Logo
2:22 pm - 7:27 amHLN-IAD
15h 05m2 stops
United Airlines Logo
8:25 am - 1:27 pmIAD-HLN
7h 02m1 stop
$682United Airlines
Find Deal
Wed, Nov 26 - Fri, Nov 28

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
Dec 10
HLN6:28 pmHelena
20h 08m
1 stop
IAD4:36 pmWashington, D.C. Dulles Intl
Dec 13
IAD7:34 amWashington, D.C. Dulles Intl
12h 17m
1 stop
HLN5:51 pmHelena
$324
Find similar
Alaska Airlines
Dec 10
HLN6:28 pmHelena
20h 08m
1 stop
IAD4:36 pmWashington, D.C. Dulles Intl
Dec 13
IAD7:34 amWashington, D.C. Dulles Intl
12h 17m
1 stop
HLN5:51 pmHelena
$382
Find similar
Alaska Airlines
Jan 11
HLN5:59 pmHelena
21h 05m
2 stops
IAD5:04 pmWashington, D.C. Dulles Intl
Jan 14
IAD6:04 pmWashington, D.C. Dulles Intl
25h 18m
1 stop
HLN5:22 pmHelena
$429
Find similar

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
Dec 10
HLN1:06 pmHelena
32h 21m
2 stops
IAD11:27 pmWashington, D.C. Dulles Intl
Dec 13
IAD7:05 amWashington, D.C. Dulles Intl
7h 20m
1 stop
HLN12:25 pmHelena
$432
Find similar
Delta
Dec 10
HLN1:06 pmHelena
32h 21m
2 stops
IAD11:27 pmWashington, D.C. Dulles Intl
Dec 13
IAD7:05 amWashington, D.C. Dulles Intl
7h 20m
1 stop
HLN12:25 pmHelena
$451
Find similar
Delta
Dec 10
HLN1:06 pmHelena
32h 21m
2 stops
IAD11:27 pmWashington, D.C. Dulles Intl
Dec 13
IAD7:15 amWashington, D.C. Dulles Intl
31h 10m
2 stops
HLN12:25 pmHelena
$455
Find similar

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 November 4, 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

Fly to

Route

Depart

Return

Price

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 12/10

6:28 pm-4:36 pm

1 stop20h 08m

Washington, D.C. Dulles Intl

Sat 12/13

7:34 am-5:51 pm

1 stop12h 17m

$324

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 12/10

6:28 pm-4:36 pm

1 stop20h 08m

Washington, D.C. Dulles Intl

Sat 12/13

7:34 am-5:51 pm

1 stop12h 17m

$382

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 1/11

5:59 pm-5:04 pm

2 stops21h 05m

Washington, D.C. Dulles Intl

Wed 1/14

6:04 pm-5:22 pm

1 stop25h 18m

$429

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 12/10

1:06 pm-11:27 pm

2 stops32h 21m

Washington, D.C. Dulles Intl

Sat 12/13

7:05 am-12:25 pm

1 stop7h 20m

$432

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 12/10

1:06 pm-11:27 pm

2 stops32h 21m

Washington, D.C. Dulles Intl

Sat 12/13

7:05 am-12:25 pm

1 stop7h 20m

$451

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 12/10

1:06 pm-11:27 pm

2 stops32h 21m

Washington, D.C. Dulles Intl

Sat 12/13

7:15 am-12:25 pm

2 stops31h 10m

$455

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Mon 1/12

5:59 pm-4:26 pm

1 stop20h 27m

Washington, D.C. Dulles Intl

Thu 1/15

5:26 pm-5:22 pm

2 stops25h 56m

$494

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 1/11

6:15 am-4:35 pm

1 stop8h 20m

Washington, D.C. Dulles Intl

Wed 1/14

4:11 pm-9:26 pm

1 stop7h 15m

$508

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 11/18

6:40 am-5:16 am

1 stop20h 36m

Washington, D.C. Dulles Intl

Sat 11/22

5:30 pm-9:22 pm

2 stops29h 52m

$681

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 11/26

2:22 pm-7:27 am

2 stops15h 05m

Washington, D.C. Dulles Intl

Fri 11/28

8:25 am-1:27 pm

1 stop7h 02m

$682

Flights are sorted by cheapest round-trip flights 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 day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Wednesday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $434. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Helena to Washington, D.C. Dulles Intl Airport for around $458.

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Flying to Washington, D.C. Dulles Intl Airport from Helena at noon is the least expensive time of day to depart. momondo users have found prices as low as $434 when looking at flights departing at noon. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $563 on average. Flights to Washington, D.C. Dulles Intl Airport from Helena in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

Direct flights

None
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.
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  • 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 53m.

  • 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
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Harpers Ferry
Towson
Rockville
Manassas
Reston
Gaithersburg
Fairfax
Sterling

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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