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Cheap flights from Helena to Washington, D.C. from $155

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 5/23. 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
0 bags

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Find the cheapest flights from Helena to Washington, D.C.

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
2:25 pm - 11:34 pm
HLN
-
IAD
7h 09m
1 stop
United Airlines Logo
2:21 pm - 9:33 pm
IAD
-
HLN
9h 12m
1 stop
$309United Airlines
Sat, Apr 18 - Wed, Apr 22
United Airlines Logo
2:30 pm - 11:27 pm
HLN
-
BWI
6h 57m
1 stop
United Airlines Logo
4:12 pm - 9:46 pm
BWI
-
HLN
7h 34m
1 stop
$329United Airlines
Wed, May 6 - Sat, May 9
Alaska Airlines Logo
6:22 pm - 12:09 am
HLN
-
IAD
27h 47m
1 stop
Alaska Airlines Logo
6:00 am - 4:06 pm
IAD
-
HLN
12h 06m
1 stop
$330Alaska Airlines
Tue, May 5 - Wed, May 13
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
$354Alaska Airlines
Thu, May 7 - Tue, May 12
Delta Logo
1:03 pm - 11:25 pm
HLN
-
BWI
8h 22m
1 stop
Delta Logo
7:00 am - 12:23 pm
BWI
-
HLN
7h 23m
1 stop
$354Delta
Sat, May 9 - Tue, May 12
United Airlines Logo
2:30 pm - 11:27 pm
HLN
-
BWI
6h 57m
1 stop
United Airlines Logo
6:15 am - 1:38 pm
BWI
-
HLN
9h 23m
2 stops
$356United Airlines
Wed, May 6 - Sat, May 9
Alaska Airlines Logo
6:22 pm - 5:50 am
HLN
-
IAD
9h 28m
1 stop
Alaska Airlines Logo
6:47 pm - 4:06 pm
IAD
-
HLN
23h 19m
2 stops
$361Alaska Airlines
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
$379Alaska Airlines
Wed, May 6 - Tue, May 12
Delta Logo
1:03 pm - 12:57 am
HLN
-
BWI
9h 54m
2 stops
Delta Logo
7:00 am - 12:23 pm
BWI
-
HLN
7h 23m
1 stop
$389Delta
Sat, May 9 - Tue, May 12
Delta Logo
1:04 pm - 9:11 am
HLN
-
BWI
18h 07m
2 stops
Delta Logo
7:00 am - 12:23 pm
BWI
-
HLN
7h 23m
1 stop
$417Delta
Tue, May 5 - Tue, May 12

United Airlines flights from Helena to Washington, D.C.

Our best United Airlines deals on Helena to Washington, D.C. flight tickets
United Airlines
Apr 18
HLN2:25 pmHelena
7h 09m
1 stop
IAD11:34 pmWashington, D.C. Dulles Intl
Apr 22
IAD2:21 pmWashington, D.C. Dulles Intl
9h 12m
1 stop
HLN9:33 pmHelena
$309
United Airlines
May 6
HLN2:30 pmHelena
6h 57m
1 stop
BWI11:27 pmBaltimore/Washington
May 9
BWI4:12 pmBaltimore/Washington
7h 34m
1 stop
HLN9:46 pmHelena
$329
United Airlines
May 6
HLN2:30 pmHelena
6h 57m
1 stop
BWI11:27 pmBaltimore/Washington
May 9
BWI6:15 amBaltimore/Washington
9h 23m
2 stops
HLN1:38 pmHelena
$356

Alaska Airlines flights from Helena to Washington, D.C.

Our best Alaska Airlines deals on Helena to Washington, D.C. flight tickets
Alaska Airlines
May 5
HLN6:22 pmHelena
27h 47m
1 stop
IAD12:09 amWashington, D.C. Dulles Intl
May 13
IAD6:00 amWashington, D.C. Dulles Intl
12h 06m
1 stop
HLN4:06 pmHelena
$330
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
$354
Alaska Airlines
May 7
HLN6:22 pmHelena
9h 28m
1 stop
IAD5:50 amWashington, D.C. Dulles Intl
May 12
IAD6:47 pmWashington, D.C. Dulles Intl
23h 19m
2 stops
HLN4:06 pmHelena
$361

momondo Fare Finder

 
Customize your flight search to find flights from Helena to Washington, D.C. 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 March 4, 2026.
Use the filters below to find and compare flights from Helena to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 4/18

2:25 pm-11:34 pm

1 stop7h 09m

Washington, D.C. Dulles Intl

Wed 4/22

2:21 pm-9:33 pm

1 stop9h 12m

$309

HelenaBaltimore

HLN - BWI

HLNBWI

Helena

Wed 5/6

2:30 pm-11:27 pm

1 stop6h 57m

Baltimore/Washington

Sat 5/9

4:12 pm-9:46 pm

1 stop7h 34m

$329

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 5/5

6:22 pm-12:09 am

1 stop27h 47m

Washington, D.C. Dulles Intl

Wed 5/13

6:00 am-4:06 pm

1 stop12h 06m

$330

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

$354

HelenaBaltimore

HLN - BWI

HLNBWI

Helena

Sat 5/9

1:03 pm-11:25 pm

1 stop8h 22m

Baltimore/Washington

Tue 5/12

7:00 am-12:23 pm

1 stop7h 23m

$354

HelenaBaltimore

HLN - BWI

HLNBWI

Helena

Wed 5/6

2:30 pm-11:27 pm

1 stop6h 57m

Baltimore/Washington

Sat 5/9

6:15 am-1:38 pm

2 stops9h 23m

$356

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

6:47 pm-4:06 pm

2 stops23h 19m

$361

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 5/6

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

$379

HelenaBaltimore

HLN - BWI

HLNBWI

Helena

Sat 5/9

1:03 pm-12:57 am

2 stops9h 54m

Baltimore/Washington

Tue 5/12

7:00 am-12:23 pm

1 stop7h 23m

$389

HelenaBaltimore

HLN - BWI

HLNBWI

Helena

Tue 5/5

1:04 pm-9:11 am

2 stops18h 07m

Baltimore/Washington

Tue 5/12

7:00 am-12:23 pm

1 stop7h 23m

$417

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.

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

Can stopping save me money on Helena to Washington, D.C. flights?

You could potentially save up to 8% on your flight if you consider stops on a Helena to Washington, D.C. flight.

When to book flights from Helena to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from Helena to Washington, D.C. 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. (HLN to WAS) flight deals and tips

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

Fastest flight time

6h 42m

Direct flights

None
The fastest flight from Helena to Washington, D.C. takes 6h 42m
There are no direct flights from Helena to Washington, D.C.. There are no popular flight routes from Helena to Washington, D.C..
Search flight deals

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

    There are 1835.3 mi between Helena and Washington, D.C.. In terms of flight time, this usually takes a little over 6h 42m.

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

    Prices for flights from Helena Airport to Washington, D.C. refresh daily.

  • How many operators does momondo search for flights from Helena Airport to Washington, D.C.?

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

    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..

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

    The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Helena to Washington, D.C.

Compare and see reviews for airlines that fly from Helena to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $503Free CancellationRating
7.4
9,389 reviews
Search United Airlines flights

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
Waldorf
Woodbridge
Colonial Beach
Laurel
Towson
Silver Spring
Gaithersburg
Fredericksburg
Rockville
Tysons
Manassas
Springfield
Bethesda
Fairfax
Linthicum Heights
Reston

Why use momondo?

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

Finding the right flight to Washington, D.C. from Helena is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Washington, D.C. quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to Washington, D.C. from Helena which offer a flexible booking policy as well as other useful filters and features.

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

momondo helps you find the best flight between Helena and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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 not ready to book a flight from Helena to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport