SEA - HRL

$210 Find Cheap Flights from Seattle to Harlingen - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Harlingen departing on 6/26. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Harlingen

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Harlingen, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Harlingen, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$311
Typical prices: $413-$391
Southwest
Fri 10/23Tue 10/27
SEA - HRL • 2 stops
Cheapest one-way
$210
Typical prices: $226-$359
United Airlines
Fri 6/26
SEA - HRL • 1 stop
Top airlines
Southwest
Cheapest • from $311 (round-trip)
American Airlines
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Seattle and Harlingen. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Houston (IAH)
Cheapest • Avg $519 (round-trip)
Austin (AUS)
Shortest trip • 6h 50m (one-way)
Insights
Insights
Insights
Insights
When to travel
September
Cheapest • 100% price drop
January
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Harlingen!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Seattle to Harlingen (SEA-HRL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Harlingen that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Harlingen

Fri, Oct 23 - Tue, Oct 27
Southwest Logo
1:10 pm - 11:40 pm
SEA
-
HRL
8h 30m
2 stops
Southwest Logo
4:40 pm - 11:45 pm
HRL
-
SEA
9h 05m
2 stops
$311Southwest
Thu, Jul 23 - Tue, Jul 28
Southwest Logo
11:05 am - 11:45 pm
SEA
-
HRL
10h 40m
1 stop
Southwest Logo
5:00 pm - 9:45 pm
HRL
-
SEA
6h 45m
1 stop
$357Southwest
Thu, Jul 23 - Tue, Jul 28
Southwest Logo
11:05 am - 11:45 pm
SEA
-
HRL
10h 40m
1 stop
Southwest Logo
5:00 pm - 12:45 am
HRL
-
SEA
9h 45m
2 stops
$363Southwest
Thu, Jul 23 - Tue, Jul 28
Southwest Logo
5:15 am - 5:00 pm
SEA
-
HRL
9h 45m
2 stops
Southwest Logo
5:00 pm - 12:35 am
HRL
-
SEA
9h 35m
2 stops
$392Southwest
Wed, Jul 1 - Tue, Jul 7
Southwest Logo
8:50 am - 11:00 pm
SEA
-
HRL
12h 10m
1 stop
Southwest Logo
5:00 pm - 12:35 am
HRL
-
SEA
9h 35m
2 stops
$396Southwest
Tue, Sep 29 - Sat, Oct 3
United Airlines Logo
7:11 am - 3:59 pm
SEA
-
HRL
6h 48m
1 stop
United Airlines Logo
2:00 pm - 11:26 pm
HRL
-
SEA
11h 26m
2 stops
$401United Airlines
Wed, Jul 1 - Tue, Jul 7
Southwest Logo
5:15 am - 4:15 pm
SEA
-
HRL
9h 00m
2 stops
Southwest Logo
7:05 am - 2:45 pm
HRL
-
SEA
9h 40m
2 stops
$407Southwest
Wed, Jul 1 - Tue, Jul 7
Southwest Logo
8:50 am - 11:00 pm
SEA
-
HRL
12h 10m
1 stop
Southwest Logo
5:00 pm - 12:35 am
HRL
-
SEA
9h 35m
2 stops
$411Southwest
Wed, Jul 1 - Tue, Jul 7
Southwest Logo
5:15 am - 4:15 pm
SEA
-
HRL
9h 00m
2 stops
Southwest Logo
5:00 pm - 12:35 am
HRL
-
SEA
9h 35m
2 stops
$421Southwest
Tue, Sep 29 - Sat, Oct 3
United Airlines Logo
7:11 am - 3:59 pm
SEA
-
HRL
6h 48m
1 stop
United Airlines Logo
2:00 pm - 7:03 pm
HRL
-
SEA
7h 03m
1 stop
$426United Airlines
Booking Insights

KAYAK's insights & trends for Seattle to Harlingen flights

Get data-powered insights and trends into flights from Seattle to Harlingen to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Seattle to Harlingen?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Seattle to Harlingen departing in October.

What is the cheapest month to fly from Seattle to Harlingen?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Harlingen, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Harlingen is September, where tickets cost $0 (return) on average. On the other hand, the most expensive months are December and July, where the average cost of round-trip tickets is $849 and $797 respectively.

Find deals

Good to know

Low seasonMay
Cheapest flight$210
Best time to beat the crowds with an average 41% drop in price.
Most popular time to fly and prices are also 34% lower on average.
Flight from Seattle to Harlingen

When to book flights from Seattle to Harlingen

Are your dates flexible? Find out the best times to travel from Seattle to Harlingen based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Seattle to Harlingen

  • What is the cheapest flight from Seattle to Harlingen?

    In the last 5 days, the lowest price for a flight from Seattle to Harlingen was $210 for a one-way ticket and $311 for a round-trip.

  • Do I need a passport to fly between Seattle and Harlingen?

    No

  • Which aircraft models fly most regularly from Seattle to Harlingen?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Seattle to Harlingen?

    oneworld is the only airline alliance operating flights between Seattle and Harlingen.

  • How does KAYAK find such low prices on flights from Seattle to Harlingen?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Harlingen.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Harlingen?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Harlingen from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Harlingen?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Harlingen with an airline and back to Seattle with another airline. Booking your flights between Seattle and HRL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Harlingen?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Harlingen from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Seattle to Harlingen

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Harlingen. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Harlingen? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11636 reviews
7.9Crew
7.2Comfort
6.9Entertainment
7.5Boarding
6.4Food
Airline reviews

The flight back to Dallas was delayed, which has happened to me several times with American Airlines. There was no announcement, no update sent out, no compensation offered for the inconvenience.

2.0 MediocreBryan, Jun 2026
MAF - DFW
Read more American Airlines reviews

The flight back to Dallas was delayed, which has happened to me several times with American Airlines. There was no announcement, no update sent out, no compensation offered for the inconvenience.

As always, most AA flights that we fly are almost ALWAYS delayed and that too multiple times. Very frustrating

Boarding was smooth and seamless and the flight was without incident.

Food is what you expect on a plane. Nothing gluten free. But that is expected. Drinks, apple juice, was fine. Seat, what I expected. Fine.

The flight took off an hour late which made the connection concerning

The flight from Dallas to Tokyo was not on Japan Airlines. It was on American Airlines. Very disappointed that we did not fly on Japan Airlines. Will not be using you liars again. I’ll just book direct from the airline next time. Wish you could make this right and has us fly on Japan Air when heading back home to the US.

They made nearly everyone check their bag because the overhead bins are way too small. Extremely inconvenient

It was what i expected. I like the movies you can access from your phone. It would be nice if there was a gluten free snack offered. But I did bring my own snack knowing there would not be a gluten free option

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

We got delayed getting out of DFW for broken overhead bins. Once the flight got underway the captain kept the seatbelt sign lit the entire flight despite little perceptible turbulence, preventing use of the rest rooms and any sort of refreshment service in the main cabin.

Everything you need to know for your flight from Seattle to Harlingen

Information on your arrival and departure airports

Seattle (SEA)
Harlingen (HRL)