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Cheap flights from Helena to Washington, D.C. from $359

This is the cheapest round-trip 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 1/21. 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

Discover deals from 900+ travel sites with momondo.

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

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
5:45 am - 4:17 pmHLN  Helena-DCA Washington, D.C. Reagan-National
8h 32m1 stop Salt Lake City
Delta Logo
5:00 pm - 10:41 pmDCA  Washington, D.C. Reagan-National-HLN Helena
7h 41m1 stop Salt Lake City
$359Delta
Thu, Jan 21 - Sun, Jan 24
Delta Logo
7:00 am - 4:46 pmHLN  Helena-DCA Washington, D.C. Reagan-National
7h 46m1 stop Salt Lake City
Delta Logo
5:00 pm - 10:41 pmDCA  Washington, D.C. Reagan-National-HLN Helena
7h 41m1 stop Salt Lake City
$359Delta
Tue, Dec 15 - Tue, Jan 5
Delta Logo
7:00 am - 4:46 pmHLN  Helena-DCA Washington, D.C. Reagan-National
7h 46m1 stop Salt Lake City
Delta Logo
5:00 pm - 10:41 pmDCA  Washington, D.C. Reagan-National-HLN Helena
7h 41m1 stop Salt Lake City
$359Delta
Tue, Dec 15 - Wed, Jan 6
Delta Logo
5:45 am - 7:19 pmHLN  Helena-DCA Washington, D.C. Reagan-National
11h 34m2 stops Salt Lake City Cincinnati Cinci./N. Kentucky
Delta Logo
5:00 pm - 10:41 pmDCA  Washington, D.C. Reagan-National-HLN Helena
7h 41m1 stop Salt Lake City
$364Delta
Thu, Jan 21 - Sun, Jan 24
Delta Logo
7:00 am - 6:37 pmHLN  Helena-DCA Washington, D.C. Reagan-National
9h 37m2 stops Salt Lake City Cincinnati Cinci./N. Kentucky
Delta Logo
5:00 pm - 10:41 pmDCA  Washington, D.C. Reagan-National-HLN Helena
7h 41m1 stop Salt Lake City
$364Delta
Tue, Dec 15 - Tue, Jan 5
Delta Logo
7:00 am - 4:46 pmHLN  Helena-DCA Washington, D.C. Reagan-National
7h 46m1 stop Salt Lake City
Delta Logo
12:05 pm - 10:41 pmDCA  Washington, D.C. Reagan-National-HLN Helena
12h 36m2 stops Atlanta Hartsfield-Jackson Salt Lake City
$364Delta
Tue, Dec 15 - Wed, Jan 6
Delta Logo
7:00 am - 6:37 pmHLN  Helena-DCA Washington, D.C. Reagan-National
9h 37m2 stops Salt Lake City Cincinnati Cinci./N. Kentucky
Delta Logo
10:00 am - 10:41 pmDCA  Washington, D.C. Reagan-National-HLN Helena
14h 41m2 stops Atlanta Hartsfield-Jackson Salt Lake City
$369Delta
Tue, Dec 15 - Wed, Jan 6
Delta Logo
7:00 am - 6:37 pmHLN  Helena-DCA Washington, D.C. Reagan-National
9h 37m2 stops Salt Lake City Cincinnati Cinci./N. Kentucky
Delta Logo
12:59 pm - 10:41 pmDCA  Washington, D.C. Reagan-National-HLN Helena
11h 42m2 stops Detroit Metropolitan Wayne County Salt Lake City
$369Delta
Tue, Dec 15 - Tue, Jan 5
United Airlines Logo
6:28 am - 2:55 pmHLN  Helena-DCA Washington, D.C. Reagan-National
6h 27m1 stop Denver Intl
United Airlines Logo
4:09 pm - 9:31 pmDCA  Washington, D.C. Reagan-National-HLN Helena
7h 22m1 stop Denver Intl
$504United Airlines
Sat, Oct 31 - Wed, Nov 4
United Airlines Logo
6:28 am - 2:55 pmHLN  Helena-DCA Washington, D.C. Reagan-National
6h 27m1 stop Denver Intl
United Airlines Logo
6:25 am - 9:31 pmDCA  Washington, D.C. Reagan-National-HLN Helena
17h 06m2 stops Chicago O'Hare Intl Denver Intl
$562United Airlines
Sat, Oct 31 - Wed, Nov 4

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United Airlines flights from Helena to Washington, D.C. Reagan-National Airport

Our best United Airlines deals on Helena to Washington, D.C. Reagan-National Airport flight tickets
United Airlines
Oct 31
HLN6:28 amHelena
6h 27m
1 stop
DCA2:55 pmWashington, D.C. Reagan-National
Nov 4
DCA4:09 pmWashington, D.C. Reagan-National
7h 22m
1 stop
HLN9:31 pmHelena
$504
United Airlines
Oct 31
HLN6:28 amHelena
6h 27m
1 stop
DCA2:55 pmWashington, D.C. Reagan-National
Nov 4
DCA6:25 amWashington, D.C. Reagan-National
17h 06m
2 stops
HLN9:31 pmHelena
$562
United Airlines
Oct 31
HLN6:28 amHelena
6h 27m
1 stop
DCA2:55 pmWashington, D.C. Reagan-National
Nov 4
DCA6:25 amWashington, D.C. Reagan-National
33h 15m
3 stops
HLN1:40 pmHelena
$568

Delta flights from Helena to Washington, D.C. Reagan-National Airport

Our best Delta deals on Helena to Washington, D.C. Reagan-National Airport flight tickets
Delta
Dec 15
HLN7:00 amHelena
7h 46m
1 stop
DCA4:46 pmWashington, D.C. Reagan-National
Jan 5
DCA5:00 pmWashington, D.C. Reagan-National
7h 41m
1 stop
HLN10:41 pmHelena
$359
Delta
Dec 15
HLN7:00 amHelena
9h 37m
2 stops
DCA6:37 pmWashington, D.C. Reagan-National
Jan 5
DCA5:00 pmWashington, D.C. Reagan-National
7h 41m
1 stop
HLN10:41 pmHelena
$364
Delta
Dec 15
HLN7:00 amHelena
9h 37m
2 stops
DCA6:37 pmWashington, D.C. Reagan-National
Jan 6
DCA10:00 amWashington, D.C. Reagan-National
14h 41m
2 stops
HLN10:41 pmHelena
$369

momondo Fare Finder

 
Customize your flight search to find flights from Helena to Washington, D.C. Reagan-National 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 August 18, 2026.
Use the filters below to find and compare flights from Helena to Washington, D.C. Reagan-National Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Thu 1/21

5:45 am-4:17 pm

1 stop8h 32m

Washington, D.C. Reagan-National

Sun 1/24

5:00 pm-10:41 pm

1 stop7h 41m

$359

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Tue 12/15

7:00 am-4:46 pm

1 stop7h 46m

Washington, D.C. Reagan-National

Tue 1/5

5:00 pm-10:41 pm

1 stop7h 41m

$359

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Tue 12/15

7:00 am-4:46 pm

1 stop7h 46m

Washington, D.C. Reagan-National

Wed 1/6

5:00 pm-10:41 pm

1 stop7h 41m

$359

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Thu 1/21

5:45 am-7:19 pm

2 stops11h 34m

Washington, D.C. Reagan-National

Sun 1/24

5:00 pm-10:41 pm

1 stop7h 41m

$364

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Tue 12/15

7:00 am-6:37 pm

2 stops9h 37m

Washington, D.C. Reagan-National

Tue 1/5

5:00 pm-10:41 pm

1 stop7h 41m

$364

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Tue 12/15

7:00 am-4:46 pm

1 stop7h 46m

Washington, D.C. Reagan-National

Wed 1/6

12:05 pm-10:41 pm

2 stops12h 36m

$364

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Tue 12/15

7:00 am-6:37 pm

2 stops9h 37m

Washington, D.C. Reagan-National

Wed 1/6

10:00 am-10:41 pm

2 stops14h 41m

$369

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Tue 12/15

7:00 am-6:37 pm

2 stops9h 37m

Washington, D.C. Reagan-National

Tue 1/5

12:59 pm-10:41 pm

2 stops11h 42m

$369
Quickest round-trip

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Sat 10/31

6:28 am-2:55 pm

1 stop6h 27m

Washington, D.C. Reagan-National

Wed 11/4

4:09 pm-9:31 pm

1 stop7h 22m

$504

HelenaWashington, D.C.

HLN Helena - DCA Washington, D.C. Reagan-National

HLNDCA

Helena

Sat 10/31

6:28 am-2:55 pm

1 stop6h 27m

Washington, D.C. Reagan-National

Wed 11/4

6:25 am-9:31 pm

2 stops17h 06m

$562

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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. Reagan-National 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. Reagan-National?

Alaska Airlines and United Airlines are the most popular carriers operating from Helena to Washington, D.C. Reagan-National

What airlines fly to Washington, D.C. Reagan-National Airport?

United Airlines, Delta and American Airlines are the top three most popular airlines that fly to Washington, D.C. Reagan-National Airport from Helena according to our data. United Airlines is the first choice among our users, with 50% of people opting to fly with this airline when traveling to Washington, D.C. Reagan-National Airport. Keep in mind that there are 3 different airlines that fly to Washington, D.C. Reagan-National 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. Reagan-National Airport

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

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

Best Price Found

$393

Fastest flight time

6h 27m

Direct flights

None
The best one-way flight to Washington, D.C. Reagan-National Airport from Helena in the past 72 hours is $393. The best round-trip flight deal from Helena to Washington, D.C. Reagan-National Airport found on momondo in the last 72 hours is $359.
The fastest flight from Helena to Washington, D.C. Reagan-National Airport takes 6h 27m
There are no direct flights from Helena to Washington, D.C. Reagan-National Airport. There are no popular flight routes from Helena to Washington, D.C. Reagan-National Airport.
Search flight deals

Frequently asked questions about flying from Helena to Washington, D.C. Reagan-National Airport

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

    Helena and Washington, D.C. Reagan-National are 1837.0 mi apart from one another. In terms of flight time, this usually takes a little over 6h 27m.

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

    Prices for flights from Helena Airport to Washington, D.C. Reagan-National Airport are refreshed on a daily basis.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Helena Airport to Washington, D.C. Reagan-National Airport.

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

    The travel and health documents required for your trip to Washington, D.C. Reagan-National Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington, D.C. Reagan-National Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Helena to Washington, D.C. Reagan-National Airport?

Best airlines flying from Helena to Washington, D.C. Reagan-National Airport

Compare and see reviews for airlines that fly from Helena to Washington, D.C. Reagan-National Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $503Free CancellationRating
7.4
10,100 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
Arlington
Gettysburg
Waldorf
Laurel
Woodbridge
Fredericksburg
Gaithersburg
Linthicum Heights
Rockville
Silver Spring
Towson
Springfield
Colonial Beach
Fairfax
Edgewood
Tysons
College Park
Glen Burnie

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Helena to Washington, D.C.. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Helena to Washington, D.C. flights to just show those with flexible booking policies.

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 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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