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Cheap flights from Seattle to Harlingen from $208

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Harlingen departing on 8/18. 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 Seattle to Harlingen

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
5:00 am - 2:16 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
7h 16m1 stop Dallas/Fort Worth
American Airlines Logo
5:50 am - 1:35 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
9h 45m1 stop Dallas/Fort Worth
$366American Airlines
Fri, Oct 23 - Tue, Oct 27
United Airlines Logo
7:05 am - 4:01 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
6h 56m1 stop Houston George Bush Intcntl
United Airlines Logo
5:05 am - 4:27 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
13h 22m2 stops Houston George Bush Intcntl San Francisco
$368United Airlines
Wed, Nov 11 - Sun, Nov 15
Southwest Logo
9:00 am - 5:50 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
6h 50m1 stop Austin Bergstrom
Southwest Logo
6:15 am - 2:20 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
10h 05m2 stops Houston Hobby Denver Intl
$378Southwest
Fri, Oct 23 - Tue, Oct 27
Southwest Logo
5:50 am - 5:50 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
10h 00m2 stops Denver Intl Austin Bergstrom
Southwest Logo
6:15 am - 1:35 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
9h 20m2 stops Houston Hobby Sacramento Intl
$383Southwest
Fri, Oct 23 - Tue, Oct 27
Southwest Logo
9:30 am - 8:40 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
9h 10m2 stops Denver Intl Austin Bergstrom
Southwest Logo
4:45 pm - 12:55 amHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
10h 10m2 stops Houston Hobby Phoenix Sky Harbor Intl
$383Southwest
Wed, Nov 11 - Sun, Nov 15
Southwest Logo
9:15 am - 8:40 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
9h 25m1 stop Austin Bergstrom
Southwest Logo
10:45 am - 7:15 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
10h 30m1 stop Austin Bergstrom
$384Southwest
Wed, Nov 11 - Sun, Nov 15
Southwest Logo
12:35 pm - 8:35 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
6h 00m1 stop Austin Bergstrom
Southwest Logo
5:55 pm - 12:45 amHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
8h 50m2 stops Austin Bergstrom Phoenix Sky Harbor Intl
$399Southwest
Fri, Sep 18 - Mon, Sep 21
Southwest Logo
5:30 am - 6:50 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
11h 20m2 stops Las Vegas Harry Reid Intl Austin Bergstrom
Southwest Logo
1:45 pm - 11:05 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
11h 20m2 stops Austin Bergstrom Denver Intl
$415Southwest
Sat, Aug 22 - Wed, Aug 26
United Airlines Logo
1:58 pm - 10:48 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
6h 50m1 stop Houston George Bush Intcntl
United Airlines Logo
1:59 pm - 7:17 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
7h 18m1 stop Houston George Bush Intcntl
$417United Airlines
Sat, Oct 31 - Wed, Nov 4
American Airlines Logo
5:50 am - 10:54 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
15h 04m2 stops Chicago O'Hare Intl Dallas/Fort Worth
American Airlines Logo
8:03 pm - 12:50 amHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
6h 47m1 stop Dallas/Fort Worth
$629American Airlines
Fri, Aug 21 - Thu, Aug 27

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American Airlines flights from Seattle to Harlingen

Our best American Airlines deals on Seattle to Harlingen flight tickets
American Airlines
Oct 23
SEA5:00 amSeattle/Tacoma Intl
7h 16m
1 stop
HRL2:16 pmHarlingen Valley Intl
Oct 27
HRL5:50 amHarlingen Valley Intl
9h 45m
1 stop
SEA1:35 pmSeattle/Tacoma Intl
$366
American Airlines
Aug 21
SEA2:07 pmSeattle/Tacoma Intl
6h 47m
1 stop
HRL10:54 pmHarlingen Valley Intl
Aug 27
HRL8:03 pmHarlingen Valley Intl
6h 47m
1 stop
SEA12:50 amSeattle/Tacoma Intl
$574
American Airlines
Aug 21
SEA2:07 pmSeattle/Tacoma Intl
6h 47m
1 stop
HRL10:54 pmHarlingen Valley Intl
Aug 27
HRL8:03 pmHarlingen Valley Intl
6h 47m
1 stop
SEA12:50 amSeattle/Tacoma Intl
$619

United Airlines flights from Seattle to Harlingen

Our best United Airlines deals on Seattle to Harlingen flight tickets
United Airlines
Nov 11
SEA7:05 amSeattle/Tacoma Intl
6h 56m
1 stop
HRL4:01 pmHarlingen Valley Intl
Nov 15
HRL5:05 amHarlingen Valley Intl
13h 22m
2 stops
SEA4:27 pmSeattle/Tacoma Intl
$368
United Airlines
Oct 31
SEA1:58 pmSeattle/Tacoma Intl
6h 50m
1 stop
HRL10:48 pmHarlingen Valley Intl
Nov 4
HRL1:59 pmHarlingen Valley Intl
7h 18m
1 stop
SEA7:17 pmSeattle/Tacoma Intl
$417
United Airlines
Oct 31
SEA10:40 amSeattle/Tacoma Intl
10h 08m
2 stops
HRL10:48 pmHarlingen Valley Intl
Nov 4
HRL7:10 amHarlingen Valley Intl
8h 15m
1 stop
SEA1:25 pmSeattle/Tacoma Intl
$422

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Harlingen 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 9, 2026.
Use the filters below to find and compare flights from Seattle to Harlingen that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Fri 10/23

5:00 am-2:16 pm

1 stop7h 16m

Harlingen Valley Intl

Tue 10/27

5:50 am-1:35 pm

1 stop9h 45m

$366

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Wed 11/11

7:05 am-4:01 pm

1 stop6h 56m

Harlingen Valley Intl

Sun 11/15

5:05 am-4:27 pm

2 stops13h 22m

$368

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Fri 10/23

9:00 am-5:50 pm

1 stop6h 50m

Harlingen Valley Intl

Tue 10/27

6:15 am-2:20 pm

2 stops10h 05m

$378

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Fri 10/23

5:50 am-5:50 pm

2 stops10h 00m

Harlingen Valley Intl

Tue 10/27

6:15 am-1:35 pm

2 stops9h 20m

$383

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Wed 11/11

9:30 am-8:40 pm

2 stops9h 10m

Harlingen Valley Intl

Sun 11/15

4:45 pm-12:55 am

2 stops10h 10m

$383

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Wed 11/11

9:15 am-8:40 pm

1 stop9h 25m

Harlingen Valley Intl

Sun 11/15

10:45 am-7:15 pm

1 stop10h 30m

$384

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Fri 9/18

12:35 pm-8:35 pm

1 stop6h 00m

Harlingen Valley Intl

Mon 9/21

5:55 pm-12:45 am

2 stops8h 50m

$399

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Sat 8/22

5:30 am-6:50 pm

2 stops11h 20m

Harlingen Valley Intl

Wed 8/26

1:45 pm-11:05 pm

2 stops11h 20m

$415
Quickest round-trip

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Sat 10/31

1:58 pm-10:48 pm

1 stop6h 50m

Harlingen Valley Intl

Wed 11/4

1:59 pm-7:17 pm

1 stop7h 18m

$417

SeattleHarlingen

SEA Seattle/Tacoma Intl - HRL Harlingen Valley Intl

SEAHRL

Seattle/Tacoma Intl

Fri 8/21

5:50 am-10:54 pm

2 stops15h 04m

Harlingen Valley Intl

Thu 8/27

8:03 pm-12:50 am

1 stop6h 47m

$629

Flights are sorted by cheapest round-trip flights first.

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How to get the cheapest flight ticket from Seattle to Harlingen

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 Seattle to Harlingen flights?

You could potentially save up to 15% on your flight if you consider stops on a Seattle to Harlingen flight.

When to book flights from Seattle to Harlingen

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

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

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

Fastest flight time

5h 55m

Direct flights

None
The fastest flight from Seattle to Harlingen takes 5h 55m
There are no direct flights from Seattle to Harlingen. There are no popular flight routes from Seattle to Harlingen.
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Frequently asked questions about flying from Seattle to Harlingen

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

    Harlingen Valley Intl is 1992.5 mi away from Seattle/Tacoma Intl. By plane, this route typically takes 5h 55m.

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

    Prices for flights from Seattle/Tacoma Intl Airport to Harlingen Valley Intl Airport are refreshed on a daily basis.

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

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

  • What documentation or ID do you need to fly to Harlingen Valley Intl Airport?

    The travel and health documents required for your trip to Harlingen Valley 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 Harlingen Valley 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 Seattle to Harlingen?

Best airlines flying from Seattle to Harlingen

Compare and see reviews for airlines that fly from Seattle to Harlingen with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $237Free CancellationRating
7.1
11,895 reviews
Search American Airlines flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Seattle to Harlingen. momondo saves you time and could save you money on your trip.

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

Yes. All flights to Harlingen from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo provides multiple filters to help you find the best flight to Harlingen from Seattle. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of Seattle to Harlingen 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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