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Cheap flights from Seattle to Harlingen from $307

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Harlingen departing on 8/25. 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
11:16 pm - 10:04 am
SEA
-
HRL
8h 48m
1 stop
American Airlines Logo
10:34 am - 4:41 pm
HRL
-
SEA
8h 07m
1 stop
$307American Airlines
Tue, Aug 25 - Tue, Sep 1
Southwest Logo
7:10 am - 8:10 pm
SEA
-
HRL
11h 00m
2 stops
Southwest Logo
7:25 am - 12:15 pm
HRL
-
SEA
6h 50m
1 stop
$327Southwest
Tue, Aug 25 - Tue, Sep 1
Southwest Logo
7:10 am - 8:10 pm
SEA
-
HRL
11h 00m
2 stops
Southwest Logo
4:25 pm - 11:05 pm
HRL
-
SEA
8h 40m
2 stops
$332Southwest
Tue, Aug 25 - Tue, Sep 1
Southwest Logo
7:00 am - 8:30 pm
SEA
-
HRL
11h 30m
2 stops
Southwest Logo
7:00 am - 4:50 pm
HRL
-
SEA
11h 50m
1 stop
$333Southwest
Thu, Aug 20 - Sat, Aug 22
Southwest Logo
8:55 am - 9:45 pm
SEA
-
HRL
10h 50m
1 stop
Southwest Logo
3:25 pm - 11:05 pm
HRL
-
SEA
9h 40m
2 stops
$339Southwest
Tue, Aug 25 - Wed, Sep 2
Southwest Logo
7:00 am - 8:30 pm
SEA
-
HRL
11h 30m
2 stops
Southwest Logo
6:05 am - 2:25 pm
HRL
-
SEA
10h 20m
2 stops
$347Southwest
Thu, Aug 20 - Sat, Aug 22
Southwest Logo
7:00 am - 8:30 pm
SEA
-
HRL
11h 30m
2 stops
Southwest Logo
5:55 pm - 12:40 am
HRL
-
SEA
8h 45m
2 stops
$353Southwest
Thu, Aug 20 - Fri, Aug 21
Southwest Logo
7:00 am - 8:30 pm
SEA
-
HRL
11h 30m
2 stops
Southwest Logo
11:55 am - 9:45 pm
HRL
-
SEA
11h 50m
1 stop
$354Southwest
Thu, Aug 20 - Fri, Aug 21
Southwest Logo
12:35 pm - 8:30 pm
SEA
-
HRL
5h 55m
1 stop
Southwest Logo
7:00 am - 4:50 pm
HRL
-
SEA
11h 50m
1 stop
$377Southwest
Thu, Aug 20 - Sat, Aug 22
American Airlines Logo
12:44 am - 10:12 am
SEA
-
HRL
7h 28m
1 stop
American Airlines Logo
8:04 pm - 12:57 am
HRL
-
SEA
6h 53m
1 stop
$384American Airlines
Thu, Jul 9 - Mon, Jul 13

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United Airlines flights from Seattle to Harlingen

Our best United Airlines deals on Seattle to Harlingen flight tickets
United Airlines
Aug 25
SEA9:00 amSeattle/Tacoma Intl
10h 52m
2 stops
HRL9:52 pmHarlingen Valley Intl
Aug 26
HRL1:59 pmHarlingen Valley Intl
9h 59m
2 stops
SEA9:58 pmSeattle/Tacoma Intl
$417
United Airlines
Aug 25
SEA9:00 amSeattle/Tacoma Intl
10h 52m
2 stops
HRL9:52 pmHarlingen Valley Intl
Aug 26
HRL1:59 pmHarlingen Valley Intl
9h 59m
2 stops
SEA9:58 pmSeattle/Tacoma Intl
$438
United Airlines
Aug 25
SEA9:00 amSeattle/Tacoma Intl
10h 52m
2 stops
HRL9:52 pmHarlingen Valley Intl
Aug 26
HRL1:59 pmHarlingen Valley Intl
9h 59m
2 stops
SEA9:58 pmSeattle/Tacoma Intl
$441

Southwest flights from Seattle to Harlingen

Our best Southwest deals on Seattle to Harlingen flight tickets
Southwest
Aug 25
SEA7:10 amSeattle/Tacoma Intl
11h 00m
2 stops
HRL8:10 pmHarlingen Valley Intl
Sep 1
HRL7:25 amHarlingen Valley Intl
6h 50m
1 stop
SEA12:15 pmSeattle/Tacoma Intl
$327
Southwest
Aug 25
SEA7:10 amSeattle/Tacoma Intl
11h 00m
2 stops
HRL8:10 pmHarlingen Valley Intl
Sep 1
HRL4:25 pmHarlingen Valley Intl
8h 40m
2 stops
SEA11:05 pmSeattle/Tacoma Intl
$332
Southwest
Aug 20
SEA7:00 amSeattle/Tacoma Intl
11h 30m
2 stops
HRL8:30 pmHarlingen Valley Intl
Aug 22
HRL7:00 amHarlingen Valley Intl
11h 50m
1 stop
SEA4:50 pmSeattle/Tacoma Intl
$333

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 June 18, 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 - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 8/25

11:16 pm-10:04 am

1 stop8h 48m

Harlingen Valley Intl

Tue 9/1

10:34 am-4:41 pm

1 stop8h 07m

$307

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 8/25

7:10 am-8:10 pm

2 stops11h 00m

Harlingen Valley Intl

Tue 9/1

7:25 am-12:15 pm

1 stop6h 50m

$327

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 8/25

7:10 am-8:10 pm

2 stops11h 00m

Harlingen Valley Intl

Tue 9/1

4:25 pm-11:05 pm

2 stops8h 40m

$332

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 8/20

7:00 am-8:30 pm

2 stops11h 30m

Harlingen Valley Intl

Sat 8/22

7:00 am-4:50 pm

1 stop11h 50m

$333

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 8/25

8:55 am-9:45 pm

1 stop10h 50m

Harlingen Valley Intl

Wed 9/2

3:25 pm-11:05 pm

2 stops9h 40m

$339

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 8/20

7:00 am-8:30 pm

2 stops11h 30m

Harlingen Valley Intl

Sat 8/22

6:05 am-2:25 pm

2 stops10h 20m

$347

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 8/20

7:00 am-8:30 pm

2 stops11h 30m

Harlingen Valley Intl

Fri 8/21

5:55 pm-12:40 am

2 stops8h 45m

$353

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 8/20

7:00 am-8:30 pm

2 stops11h 30m

Harlingen Valley Intl

Fri 8/21

11:55 am-9:45 pm

1 stop11h 50m

$354

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 8/20

12:35 pm-8:30 pm

1 stop5h 55m

Harlingen Valley Intl

Sat 8/22

7:00 am-4:50 pm

1 stop11h 50m

$377
Quickest round-trip

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 7/9

12:44 am-10:12 am

1 stop7h 28m

Harlingen Valley Intl

Mon 7/13

8:04 pm-12:57 am

1 stop6h 53m

$384

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Harlingen from

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

What is the cheapest month to fly to Harlingen?

If you aren’t able to travel during the month of September, then book flights to Harlingen from Seattle during May instead. Flights to Harlingen in May, while not as cheap as those in September, still average around $310.

Can stopping save me money on Seattle to Harlingen flights?

You could potentially save up to 21% 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

6h 50m

Direct flights

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

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 6h 50m.

  • 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
11,686 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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