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Cheap flights from Helena to Washington, D.C. from $240

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 1/7. 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
6:48 pm - 4:09 pm
HLN
-
DCA
19h 21m1 stop
Alaska Airlines Logo
5:01 pm - 6:11 pm
DCA
-
HLN
27h 10m1 stop
$364Alaska Airlines
Fri, Jan 30 - Tue, Feb 3
Alaska Airlines Logo
6:48 pm - 9:59 pm
HLN
-
DCA
25h 11m1 stop
Alaska Airlines Logo
5:09 pm - 6:11 pm
DCA
-
HLN
27h 02m2 stops
$430Alaska Airlines
Fri, Jan 30 - Tue, Feb 3
United Airlines Logo
6:15 am - 2:59 pm
HLN
-
DCA
6h 44m1 stop
United Airlines Logo
4:11 pm - 9:16 pm
DCA
-
HLN
7h 05m1 stop
$487United Airlines
Sun, Feb 15 - Fri, Feb 20
Delta Logo
5:30 am - 4:00 pm
HLN
-
DCA
8h 30m1 stop
Delta Logo
12:59 pm - 10:27 pm
DCA
-
HLN
11h 28m2 stops
$502Delta
Sun, Feb 15 - Fri, Feb 20
Alaska Airlines Logo
4:36 pm - 9:02 pm
HLN
-
DCA
26h 26m2 stops
Alaska Airlines Logo
5:00 pm - 3:59 pm
DCA
-
HLN
24h 59m1 stop
$515Alaska Airlines
Mon, Feb 16 - Fri, Feb 20
Delta Logo
5:30 am - 6:51 pm
HLN
-
DCA
11h 21m2 stops
Delta Logo
5:12 pm - 10:35 pm
DCA
-
HLN
7h 23m1 stop
$518Delta
Tue, Mar 31 - Tue, Apr 7
Delta Logo
5:30 am - 6:51 pm
HLN
-
DCA
11h 21m2 stops
Delta Logo
12:29 pm - 10:35 pm
DCA
-
HLN
12h 06m2 stops
$523Delta
Tue, Mar 31 - Tue, Apr 7
Alaska Airlines Logo
6:48 pm - 4:01 pm
HLN
-
DCA
19h 13m2 stops
Alaska Airlines Logo
6:56 pm - 6:11 pm
DCA
-
HLN
25h 15m2 stops
$543Alaska Airlines
Wed, Jan 14 - Fri, Jan 16
Alaska Airlines Logo
4:36 pm - 9:02 pm
HLN
-
DCA
26h 26m2 stops
Alaska Airlines Logo
5:06 pm - 3:59 pm
DCA
-
HLN
24h 53m2 stops
$553Alaska Airlines
Mon, Feb 16 - Fri, Feb 20
Alaska Airlines Logo
4:36 pm - 9:59 pm
HLN
-
DCA
27h 23m1 stop
Alaska Airlines Logo
8:00 am - 3:59 pm
DCA
-
HLN
9h 59m1 stop
$559Alaska Airlines
Mon, Feb 16 - Fri, Feb 20

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

Our best Alaska Airlines deals on Helena to Washington, D.C. Reagan-National Airport flight tickets
Alaska Airlines
Jan 30
HLN6:48 pmHelena
25h 11m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Feb 3
DCA8:00 amWashington, D.C. Reagan-National
12h 11m
1 stop
HLN6:11 pmHelena
$364
Find similar
Alaska Airlines
Feb 18
HLN4:36 pmHelena
27h 23m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Feb 21
DCA8:00 amWashington, D.C. Reagan-National
9h 59m
1 stop
HLN3:59 pmHelena
$413
Find similar
Alaska Airlines
Jan 30
HLN6:48 pmHelena
25h 11m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Feb 3
DCA5:09 pmWashington, D.C. Reagan-National
27h 02m
2 stops
HLN6:11 pmHelena
$430
Find similar

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
Feb 15
HLN6:15 amHelena
6h 44m
1 stop
DCA2:59 pmWashington, D.C. Reagan-National
Feb 20
DCA4:11 pmWashington, D.C. Reagan-National
7h 05m
1 stop
HLN9:16 pmHelena
$487
Find similar
United Airlines
Jan 10
HLN6:15 amHelena
12h 45m
2 stops
DCA9:00 pmWashington, D.C. Reagan-National
Jan 17
DCA4:11 pmWashington, D.C. Reagan-National
7h 15m
1 stop
HLN9:26 pmHelena
$586
Find similar
United Airlines
Dec 31
HLN6:10 amHelena
6h 49m
1 stop
DCA2:59 pmWashington, D.C. Reagan-National
Jan 6
DCA4:11 pmWashington, D.C. Reagan-National
7h 15m
1 stop
HLN9:26 pmHelena
$594
Find similar

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 December 18, 2025.
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

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Fri 1/30

6:48 pm-4:09 pm

1 stop19h 21m

Washington, D.C. Reagan-National

Tue 2/3

5:01 pm-6:11 pm

1 stop27h 10m

$364

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Fri 1/30

6:48 pm-9:59 pm

1 stop25h 11m

Washington, D.C. Reagan-National

Tue 2/3

5:09 pm-6:11 pm

2 stops27h 02m

$430

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sun 2/15

6:15 am-2:59 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Fri 2/20

4:11 pm-9:16 pm

1 stop7h 05m

$487

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sun 2/15

5:30 am-4:00 pm

1 stop8h 30m

Washington, D.C. Reagan-National

Fri 2/20

12:59 pm-10:27 pm

2 stops11h 28m

$502

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Mon 2/16

4:36 pm-9:02 pm

2 stops26h 26m

Washington, D.C. Reagan-National

Fri 2/20

5:00 pm-3:59 pm

1 stop24h 59m

$515

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Tue 3/31

5:30 am-6:51 pm

2 stops11h 21m

Washington, D.C. Reagan-National

Tue 4/7

5:12 pm-10:35 pm

1 stop7h 23m

$518

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Tue 3/31

5:30 am-6:51 pm

2 stops11h 21m

Washington, D.C. Reagan-National

Tue 4/7

12:29 pm-10:35 pm

2 stops12h 06m

$523

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Wed 1/14

6:48 pm-4:01 pm

2 stops19h 13m

Washington, D.C. Reagan-National

Fri 1/16

6:56 pm-6:11 pm

2 stops25h 15m

$543

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Mon 2/16

4:36 pm-9:02 pm

2 stops26h 26m

Washington, D.C. Reagan-National

Fri 2/20

5:06 pm-3:59 pm

2 stops24h 53m

$553

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Mon 2/16

4:36 pm-9:59 pm

1 stop27h 23m

Washington, D.C. Reagan-National

Fri 2/20

8:00 am-3:59 pm

1 stop9h 59m

$559

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. 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 day to depart on your flight to Washington, D.C. Reagan-National Airport?

The cheapest day to depart from Helena to Washington, D.C. Reagan-National Airport is on a Tuesday. Travelers who choose to depart for Washington, D.C. Reagan-National Airport on a Tuesday will often find tickets for as low as $692. Flights from Helena to Washington, D.C. Reagan-National Airport on a Monday will generally be more expensive and average around $1,080. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Fastest flight time

6h 44m

Direct flights

None
The fastest flight from Helena to Washington, D.C. Reagan-National Airport takes 6h 44m
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.
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  • 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 44m.

  • 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 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.

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

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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