HRL - SEA

$215 Find Cheap Flights from Harlingen to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Harlingen to Seattle departing on 6/20. 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

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Harlingen to Seattle, 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 Harlingen to Seattle, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Harlingen to Seattle (HRL-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Harlingen to Seattle 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 Harlingen to Seattle

Wed, Sep 10 - Tue, Sep 16
Southwest Logo
3:55 pm - 12:05 amHRL-SEA
10h 10m2 stops
Southwest Logo
10:45 pm - 11:45 amSEA-HRL
11h 00m1 stop
$248Southwest
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Thu, Sep 11 - Tue, Sep 16
American Airlines Logo
10:11 am - 4:40 pmHRL-SEA
8h 29m1 stop
American Airlines Logo
6:11 am - 6:00 pmSEA-HRL
9h 49m2 stops
$272American Airlines
Find Deal
Wed, Sep 10 - Tue, Sep 16
Southwest Logo
3:55 pm - 12:05 amHRL-SEA
10h 10m2 stops
Southwest Logo
7:00 am - 9:25 pmSEA-HRL
12h 25m2 stops
$273Southwest
Find Deal
Fri, Sep 12 - Tue, Sep 16
Southwest Logo
1:40 pm - 9:45 pmHRL-SEA
10h 05m2 stops
Southwest Logo
10:45 pm - 11:45 amSEA-HRL
11h 00m1 stop
$274Southwest
Find Deal
Fri, Sep 12 - Tue, Sep 16
Southwest Logo
1:40 pm - 9:45 pmHRL-SEA
10h 05m2 stops
Southwest Logo
7:00 am - 9:25 pmSEA-HRL
12h 25m2 stops
$299Southwest
Find Deal
Fri, Sep 12 - Tue, Sep 16
United Airlines Logo
5:25 pm - 1:30 pmHRL-SEA
22h 05m3 stops
United Airlines Logo
5:07 am - 7:33 pmSEA-HRL
12h 26m2 stops
$427United Airlines
Find Deal
Thu, Sep 11 - Tue, Sep 16
United Airlines Logo
5:25 pm - 1:30 pmHRL-SEA
22h 05m3 stops
United Airlines Logo
6:25 am - 9:52 pmSEA-HRL
13h 27m2 stops
$437United Airlines
Find Deal
Wed, Jul 16 - Sat, Jul 19
United Airlines Logo
5:20 pm - 8:48 amHRL-SEA
17h 28m2 stops
United Airlines Logo
5:00 am - 4:00 pmSEA-HRL
9h 00m1 stop
$455United Airlines
Find Deal
Tue, Jul 8 - Fri, Jul 11
American Airlines Logo
7:59 pm - 12:43 amHRL-SEA
6h 44m1 stop
American Airlines Logo
12:59 am - 9:37 amSEA-HRL
6h 38m1 stop
$459American Airlines
Find Deal
Wed, Jul 9 - Thu, Jul 17
American Airlines Logo
7:59 pm - 12:43 amHRL-SEA
6h 44m1 stop
American Airlines Logo
12:59 am - 9:37 amSEA-HRL
6h 38m1 stop
$509American Airlines
Find Deal
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KAYAK's insights & trends for Harlingen to Seattle flights

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

What’s the cheapest day of the week to fly from Harlingen to Seattle?

The average price of all round-trip flights from Harlingen to Seattle clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Seattle on a Thursday, as we generally find the cheapest rates on that day for this route. On the other hand, Saturday is the most expensive day to fly from Harlingen to Seattle. For your return ticket, we recommend flying on a Thursday and avoiding Mondays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Harlingen to Seattle, 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 Harlingen to Seattle is February, where tickets cost $263 (return) on average. On the other hand, the most expensive months are July and January, where the average cost of round-trip tickets is $692 and $558 respectively.

Good to know

Low seasonJanuary
High seasonApril
Cheapest flight$215
Best time to beat the crowds but there is an average 33% increase in price.
Most popular time to fly and prices are also 19% lower on average.
Flight from Harlingen to Seattle

When to book flights from Harlingen to Seattle

Are your dates flexible? Find out the best times to travel from Harlingen to Seattle 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 Harlingen to Seattle

  • What is the cheapest flight from Harlingen to Seattle?

    In the last 3 days, the lowest price for a flight from Harlingen to Seattle was $215 for a one-way ticket and $248 for a round-trip.

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

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

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

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

  • Which airline alliances offer flights from Harlingen to Seattle?

    Star Alliance, and oneworld are the airline alliances operating flights between Harlingen and Seattle, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from Harlingen to Seattle, United Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from Harlingen to Seattle are United Airlines and American Airlines. With an average price for the route of $472 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $426 and an overall rating of 7.2.

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

    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 Harlingen to Seattle.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Harlingen 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 Harlingen to Seattle?

    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 Seattle with an airline and back to Harlingen with another airline. Booking your flights between Harlingen and SEA 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 Harlingen to Seattle?

    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 Seattle from Harlingen up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top 3 airlines serving from Harlingen to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Harlingen to Seattle. 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 Harlingen to Seattle? 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.
8.0
DeltaOverall score based on 7950 reviews
8.2Boarding
7.9Comfort
7.3Food
7.9Entertainment
8.5Crew
Airline reviews

The check in and bag drop off for Sky Priority members is slow. The Clear security was also slow - a TSA issue.

8.0 ExcellentSunderesh, May 2025AUS - ATL
Read more Delta reviews

The check in and bag drop off for Sky Priority members is slow. The Clear security was also slow - a TSA issue.

Food from the flight from Atlanta to Santiago was very poor..

The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

I loved having a most black flight crew during Black History Month; rather by design or accident I appreciated the representation. ❤️

Flight left early and arrived early. the whole trip was excellent.

Overall, it was okay. Seat was a little cramped. Would’ve liked more substantial snacks or opportunity to buy some.

Inexpensive, got an exit row aisle aeat with no middle passenger, bought a great breakfast sandwich, flight comfortable & arrived ahead of schedule.

Delta was great the entertainment was outdated. Screen was very small and didn’t work.

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

leg space better than expected. two washrooms for one plane isn't enough.

We boarded but then sat there waiting on some missed connection people to get on so we sat for about 15 minutes for that. Then we sat again because the passenger manifest was wrong and they had to figure it out before we could leave. That took about another 20 minutes or so. The crew was working hard to figure it out so it’s not their fault. It ended up being a system glitch where someone was upgraded to first class while another person was also in the same seat and it just created a mess that took a little while to figure out. They literally went to every person on the plane asking their names to see who was sitting in the wrong seat. I also hate the entertainment that must be watched on your phone or tablet. Just give us setback screens. It’s so much better. Almost every Delta flight has this now and it is so nice to have them. The crew did a great job. I have no complaints from them. They were very hard working, even with the mishap and a disgruntled passenger.

My priority checked bag was not loaded on the flight. I had to sit in baggage claim in Las Vegas for 2 1/2 hours waiting for the next flight. All baggage staff were very helpful, tracking showed it as scanned for loading. Nobody told me why it wasn't on my flight.

Food choices were very limited. Taste of the dishes was average.

It’s been awhile since I have traveled on United. I, along with my family who were on the flight noted how smoothly everything went . Boarding, flight crew and service was excellent.

The seats on this flight were almost roomy enough to be the basic amount needed for human existence. I think my favorite part of this flight was it landed at an A gate, which was the most palatial part of Sea-Tac I've ever seen - a massive improvement from the S gates.

The seats on this flight were almost roomy enough to be the basic amount needed for human existence.

Oh my gosh, I loved my experience with United! they made me want to travel more often.

So awful Unreliable Unfriendly Bad Mad Mean Smelly Hot Late Overbooked Understaffed Expensive Cramped Narcs If they were a fruit they’d be rotten durian

At the beginning of the flight there was some turbulence and the announcement was made that there would be no beverage service. The turbulence only last about 5 minutes then it was smooth sailing. I noticed that first class got their service, but the rest of us did not.

Update departure times in a more timely manner. We are not boarding on time if the plane isn’t arriving until after our scheduled departure time.

Update.us on flight information in a more timely manner. Don’t say we are boarding on time ten minutes before the boarding time when the aircraft isn’t arriving for another forty minutes.

Took off on time and successfully avoided weather that looked to be a problem along the way

I liked everything. Except that my neck was hurting on the seat. I couldn't sleep.

We were delayed Al ost / hours after boarding so that maintenance had to add oil to the engines. Then the oil they grabbed had been left out in the Dallas record cold and was frozen. They had to go back to the hanger and grab some that was not frozen.

It was a code share with Alaska - would have been great if I actually made it on the plane, claimed I didn’t have a ticket or a seat even thought I was checked in.

They changed my seat from one that I had paid for as an upgrade to a regular seat at the last minute.

Flight was empty so had a whole row to myself. Still had to wait to get the bag due to the negligence at Palm Springs departure.

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

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