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Cheap flights from Harlingen to Seattle from $185

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Harlingen to Seattle departing on 9/18. 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 Harlingen to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
10:40 am - 4:48 pm
HRL
-
SEA
8h 08m
1 stop
American Airlines Logo
5:00 am - 2:16 pm
SEA
-
HRL
7h 16m
1 stop
$317American Airlines
Wed, Oct 14 - Wed, Oct 21
Southwest Logo
1:45 pm - 6:35 pm
HRL
-
SEA
6h 50m
1 stop
Southwest Logo
8:55 am - 8:55 pm
SEA
-
HRL
10h 00m
1 stop
$322Southwest
Tue, Sep 8 - Tue, Oct 13
United Airlines Logo
1:59 pm - 7:08 pm
HRL
-
SEA
7h 09m
1 stop
United Airlines Logo
9:00 am - 9:52 pm
SEA
-
HRL
10h 52m
2 stops
$343United Airlines
Tue, Sep 1 - Wed, Sep 9
Southwest Logo
7:25 am - 12:15 pm
HRL
-
SEA
6h 50m
1 stop
Southwest Logo
8:50 am - 9:50 pm
SEA
-
HRL
11h 00m
1 stop
$353Southwest
Tue, Sep 1 - Wed, Sep 9
Southwest Logo
3:25 pm - 11:05 pm
HRL
-
SEA
9h 40m
2 stops
Southwest Logo
7:10 am - 8:15 pm
SEA
-
HRL
11h 05m
2 stops
$354Southwest
Tue, Sep 1 - Wed, Sep 9
United Airlines Logo
5:18 pm - 11:00 pm
HRL
-
SEA
7h 42m
1 stop
United Airlines Logo
7:17 am - 3:59 pm
SEA
-
HRL
6h 42m
1 stop
$358United Airlines
Fri, Sep 25 - Tue, Sep 29
American Airlines Logo
3:35 pm - 9:52 pm
HRL
-
SEA
8h 17m
1 stop
American Airlines Logo
5:30 am - 3:05 pm
SEA
-
HRL
7h 35m
1 stop
$358American Airlines
Fri, Sep 18 - Sat, Sep 26
American Airlines Logo
3:35 pm - 9:52 pm
HRL
-
SEA
8h 17m
1 stop
American Airlines Logo
5:30 am - 3:05 pm
SEA
-
HRL
7h 35m
1 stop
$387American Airlines
Fri, Sep 18 - Sat, Sep 26
United Airlines Logo
7:15 am - 12:48 pm
HRL
-
SEA
7h 33m
1 stop
United Airlines Logo
7:05 am - 4:01 pm
SEA
-
HRL
6h 56m
1 stop
$417United Airlines
Sat, Oct 24 - Wed, Oct 28
American Airlines Logo
6:43 pm - 10:58 am
HRL
-
SEA
18h 15m
1 stop
American Airlines Logo
5:30 am - 3:05 pm
SEA
-
HRL
7h 35m
1 stop
$484American Airlines
Sat, Sep 5 - Sat, Sep 19

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United Airlines flights from Harlingen to Seattle

Our best United Airlines deals on Harlingen to Seattle flight tickets
United Airlines
Sep 1
HRL1:59 pmHarlingen Valley Intl
7h 09m
1 stop
SEA7:08 pmSeattle/Tacoma Intl
Sep 9
SEA9:00 amSeattle/Tacoma Intl
10h 52m
2 stops
HRL9:52 pmHarlingen Valley Intl
$343
United Airlines
Oct 24
HRL7:15 amHarlingen Valley Intl
7h 33m
1 stop
SEA12:48 pmSeattle/Tacoma Intl
Oct 28
SEA7:05 amSeattle/Tacoma Intl
6h 56m
1 stop
HRL4:01 pmHarlingen Valley Intl
$417
United Airlines
Oct 24
HRL7:15 amHarlingen Valley Intl
9h 34m
1 stop
SEA2:49 pmSeattle/Tacoma Intl
Oct 28
SEA10:40 amSeattle/Tacoma Intl
10h 08m
2 stops
HRL10:48 pmHarlingen Valley Intl
$422

Southwest flights from Harlingen to Seattle

Our best Southwest deals on Harlingen to Seattle flight tickets
Southwest
Sep 8
HRL1:45 pmHarlingen Valley Intl
6h 50m
1 stop
SEA6:35 pmSeattle/Tacoma Intl
Oct 13
SEA8:55 amSeattle/Tacoma Intl
10h 00m
1 stop
HRL8:55 pmHarlingen Valley Intl
$322
Southwest
Sep 1
HRL7:25 amHarlingen Valley Intl
6h 50m
1 stop
SEA12:15 pmSeattle/Tacoma Intl
Sep 9
SEA8:50 amSeattle/Tacoma Intl
11h 00m
1 stop
HRL9:50 pmHarlingen Valley Intl
$353
Southwest
Sep 1
HRL3:25 pmHarlingen Valley Intl
9h 40m
2 stops
SEA11:05 pmSeattle/Tacoma Intl
Sep 9
SEA7:10 amSeattle/Tacoma Intl
11h 05m
2 stops
HRL8:15 pmHarlingen Valley Intl
$354

momondo Fare Finder

 
Customize your flight search to find flights from Harlingen to Seattle 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 4, 2026.
Use the filters below to find and compare flights from Harlingen to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Wed 10/14

10:40 am-4:48 pm

1 stop8h 08m

Seattle/Tacoma Intl

Wed 10/21

5:00 am-2:16 pm

1 stop7h 16m

$317

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 9/8

1:45 pm-6:35 pm

1 stop6h 50m

Seattle/Tacoma Intl

Tue 10/13

8:55 am-8:55 pm

1 stop10h 00m

$322

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 9/1

1:59 pm-7:08 pm

1 stop7h 09m

Seattle/Tacoma Intl

Wed 9/9

9:00 am-9:52 pm

2 stops10h 52m

$343

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 9/1

7:25 am-12:15 pm

1 stop6h 50m

Seattle/Tacoma Intl

Wed 9/9

8:50 am-9:50 pm

1 stop11h 00m

$353

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 9/1

3:25 pm-11:05 pm

2 stops9h 40m

Seattle/Tacoma Intl

Wed 9/9

7:10 am-8:15 pm

2 stops11h 05m

$354
Quickest round-trip

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Fri 9/25

5:18 pm-11:00 pm

1 stop7h 42m

Seattle/Tacoma Intl

Tue 9/29

7:17 am-3:59 pm

1 stop6h 42m

$358

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Fri 9/18

3:35 pm-9:52 pm

1 stop8h 17m

Seattle/Tacoma Intl

Sat 9/26

5:30 am-3:05 pm

1 stop7h 35m

$358

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Fri 9/18

3:35 pm-9:52 pm

1 stop8h 17m

Seattle/Tacoma Intl

Sat 9/26

5:30 am-3:05 pm

1 stop7h 35m

$387

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 10/24

7:15 am-12:48 pm

1 stop7h 33m

Seattle/Tacoma Intl

Wed 10/28

7:05 am-4:01 pm

1 stop6h 56m

$417

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 9/5

6:43 pm-10:58 am

1 stop18h 15m

Seattle/Tacoma Intl

Sat 9/19

5:30 am-3:05 pm

1 stop7h 35m

$484

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 Seattle from

How to get the cheapest flight ticket from Harlingen to Seattle

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 month to fly to Seattle?

In general, February is the cheapest month to fly from Harlingen to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $263. If you don’t want to visit Seattle in February, then you should wait until April to fly from Harlingen, when ticket prices are also cheap, with an average price of $288.

Can stopping save me money on Harlingen to Seattle flights?

You could potentially save up to 53% on your flight if you consider stops on a Harlingen to Seattle flight.

How have Harlingen to Seattle flight prices changed over time?

When to book flights from Harlingen to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Harlingen to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Harlingen to Seattle (HRL to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Harlingen to Seattle

Fastest flight time

6h 50m

Direct flights

None
The fastest flight from Harlingen to Seattle takes 6h 50m
There are no direct flights from Harlingen to Seattle. There are no popular flight routes from Harlingen to Seattle.
Search flight deals

Frequently asked questions about flying from Harlingen to Seattle

  • How far is Harlingen Valley Intl to Seattle/Tacoma Intl by plane?

    The distance between Harlingen Valley Intl and Seattle/Tacoma Intl is about 1992.5 mi. In terms of flight time, this usually takes a little over 6h 50m.

  • When did momondo last update prices for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport were last updated today.

  • How many operators does momondo search for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Harlingen Valley Intl Airport to Seattle/Tacoma Intl 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 Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents required for your trip to Seattle/Tacoma Intl 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 Seattle/Tacoma Intl 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 Harlingen to Seattle?

Best airlines flying from Harlingen to Seattle

Compare and see reviews for airlines that fly from Harlingen to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $215Free CancellationRating
7.1
11,848 reviews
Search American Airlines flights
United AirlinesPriceFrom $236Free CancellationRating
7.4
10,059 reviews
Search United Airlines flights
SouthwestPriceFrom $297Free CancellationRating
8.0
4,222 reviews
Search Southwest flights

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Kent
Lynnwood
Redmond
Lakewood
Puyallup
Fife
Federal Way
Tukwila
Cle Elum
Marysville
Kirkland
Centralia
Shoreline
Lacey

Why use momondo?

Why should I use momondo to find a flight deal from Harlingen to Seattle?

It is quick and easy to find Harlingen to Seattle flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Seattle that suits you.

Can I find flights from Harlingen to Seattle with flexible booking policies on momondo?

Flights from Harlingen to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Harlingen to Seattle?

Once all potential Harlingen to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Harlingen to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Harlingen to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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