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Cheap Flights from Harlingen (HRL) to Seattle (SEA)

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      Travellers and cabin class, 1 Adult, Economy

      Compare Harlingen to Seattle / Tacoma International flight deals

      Find the cheapest month or even day of the year to fly to Seattle / Tacoma International

      Book the best Seattle / Tacoma International fare with no extra fees

      Flight deals from Harlingen to Seattle / Tacoma International

      Looking for a cheap last-minute deal or the best return flight from Harlingen Airport to Seattle / Tacoma International Airport? If you want to travel next month, return fares start from $516. Find the lowest prices on one-way and return tickets right here.
      Seattle.$364 per passenger.Departing Wed, 28 Oct, returning Mon, 2 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Harlingen on Wed, 28 Oct, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departs from Seattle / Tacoma International on Mon, 2 Nov, arriving in Harlingen.Price includes taxes and charges.From $364, select.
      Seattle.$516 per passenger.Departing Fri, 16 Oct, returning Thu, 22 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Harlingen on Fri, 16 Oct, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departs from Seattle / Tacoma International on Thu, 22 Oct, arriving in Harlingen.Price includes taxes and charges.From $516, select.
      Seattle.$591 per passenger.Departing Sat, 26 Sep, returning Wed, 30 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Harlingen on Sat, 26 Sep, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departs from Seattle / Tacoma International on Wed, 30 Sep, arriving in Harlingen.Price includes taxes and charges.From $591, select.
      Seattle.$619 per passenger.Departing Wed, 30 Sep, returning Sun, 4 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Harlingen on Wed, 30 Sep, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departs from Seattle / Tacoma International on Sun, 4 Oct, arriving in Harlingen.Price includes taxes and charges.From $619, select.
      Seattle.$693 per passenger.Departing Sun, 22 Nov, returning Fri, 27 Nov.Return flight with United.Outbound indirect flight with United, departs from Harlingen on Sun, 22 Nov, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departs from Seattle / Tacoma International on Fri, 27 Nov, arriving in Harlingen.Price includes taxes and charges.From $693, select.
      Seattle.$775 per passenger.Departing Sat, 26 Dec, returning Wed, 6 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Harlingen on Sat, 26 Dec, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departs from Seattle / Tacoma International on Wed, 6 Jan, arriving in Harlingen.Price includes taxes and charges.From $775, select.
      Seattle.$845 per passenger.Departing Sat, 2 Jan, returning Sat, 24 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Harlingen on Sat, 2 Jan, arriving in Seattle / Tacoma International.Inbound indirect flight with Southwest Airlines, departs from Seattle / Tacoma International on Sat, 24 Apr, arriving in Harlingen.Price includes taxes and charges.From $845, select.
      Seattle.$1,357 per passenger.Departing Sun, 20 Jun, returning Tue, 29 Jun.Return flight with United.Outbound indirect flight with United, departs from Harlingen on Sun, 20 Jun, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departs from Seattle / Tacoma International on Tue, 29 Jun, arriving in Harlingen.Price includes taxes and charges.From $1,357, select.
      Seattle.$1,498 per passenger.Departing Fri, 9 Jul, returning Thu, 22 Jul.Return flight with United.Outbound indirect flight with United, departs from Harlingen on Fri, 9 Jul, arriving in Seattle / Tacoma International.Inbound indirect flight with United, departs from Seattle / Tacoma International on Thu, 22 Jul, arriving in Harlingen.Price includes taxes and charges.From $1,498, select.
      How did we find these deals? The deals you see here are the lowest prices for flight tickets from Harlingen to Seattle / Tacoma International found in the last 4 days, and are subject to change and availability.

      Find the cheapest month to fly from Harlingen to Seattle / Tacoma International

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Harlingen to Seattle / Tacoma International flights are currently cheapest in October.
      Sep
      from $591
      Oct
      from $516
      Nov
      from $693
      Dec
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      Jan
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      Feb
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      Mar
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      Apr
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      May
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      Jun
      from $1,357
      Jul
      from $1,498
      Aug
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      Harlingen to Seattle / Tacoma International: Alternative routes

      Compare routes from Harlingen to Seattle below. You may find an airport to fly into that's cheaper, faster, or easier than Seattle / Tacoma International.

      Seattle Lake Union SPB

      2km from central Seattle
      Closest
      Search flights

      Seattle Boeing Fld

      11km from central Seattle
      Search flights

      Seattle / Tacoma International

      20km from central Seattle
      Cheapest
      from $364
      Search flights

      Paine Field

      33km from central Seattle
      Search flights

      Harlingen to Seattle: Flight information

      The things to know before you go.
      Cheapest flight found$364
      Cheapest month to flyOctober

      Finding cheap flights from Harlingen to Seattle / Tacoma International: Frequently asked questions

      The best price we found for a return flight from Harlingen to Seattle / Tacoma International is $364. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
      Currently, there are no airlines that fly direct from Harlingen to Seattle / Tacoma International. But we found flights with one or more stops from $364.
      As of September 2026, there are no flights flying from Harlingen to Seattle / Tacoma International.
      The cheapest month to fly from Harlingen to Seattle / Tacoma International is usually October.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Harlingen Airport to Seattle / Tacoma International Airport on Wednesday, 28 October 2026.
      No airlines currently offer direct flights between Harlingen Airport and Seattle / Tacoma International Airport. Most routes have one or more stops.
      We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle / Tacoma International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

      We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.

      Currently, Southwest Airlines offers the cheapest flight tickets to Seattle / Tacoma International.

      Flying from Harlingen Airport (HRL) to Seattle / Tacoma International Airport (SEA): what you need to know

      • Seattle is two hours behind Harlingen and observes the UTC-8 timezone.

      • Arriving two hours before an international flight and one hour ahead of a domestic departure are travel rules worth sticking to. Be at the airport on time to catch your HRL to SEA flight.

      • Flying during a peak time such as April? School holidays and other popular seasons can mean longer lines at check-in and security. Play it safe and get there up to four hours ahead of an international flight and two hours before a domestic departure.

      • We make it a breeze to book a flight with a stopover. To see all your options for tickets from Harlingen Airport to Seattle / Tacoma International Airport, uncheck 'Direct flights only.' Then, pick a flight offering a stop long enough to tour your chosen city. Some great stopovers between HRL and SEA include:

        • Dallas Fort Worth International Airport

        • Houston George Bush Intercntl. Airport

        • Dallas Love Field Airport

      How to find the cheapest flights from Harlingen Airport (HRL) to Seattle / Tacoma International Airport (SEA)

      • Right now, $184 is the cheapest price we've seen for a one-way Harlingen Airport to Seattle / Tacoma International Airport flight. The best price for a return ticket is $364. Keep in mind that fares could change due to availability when booking.

      • It's often best to book in advance if you're looking for cheap tickets from HRL to SEA. That's because flight prices are based on demand, which tends to rise closer to departure.

      • The 'Whole month' search function shows you the cheapest flights from Harlingen Airport to Seattle / Tacoma International Airport throughout the month. It's an easy way to find a bargain if your plans aren't set in stone.

      • Save time searching for cheap flights from HRL to SEA by setting up a Price Alert. We'll send you an email or notification through the app when a new discounted fare appears.

      • Secure the perfect flight for you with the help of the filters. To see the 'Best,' 'Cheapest' or 'Fastest' flights from Harlingen Airport to Seattle / Tacoma International Airport, use the 'Sort by' function. You can also filter by airline, departure and arrival times, and number of stops.

      Handy information about Harlingen Airport (HRL)

      • The address for HRL is 3002 Heritage Way.

      • Harlingen Airport scores high marks for on-time performance. 81% of flights that depart HRL land on time.

      • To get to Harlingen Airport from central Harlingen, it takes around 10 minutes if you're planning to drive. Of course, this depends on traffic conditions. It's approximately 8 kilometres from the airport to the city centre.

      • Planning to catch public transport? Expect a journey time of around 30 minutes.

      • Need a convenient hotel close to HRL? If you've booked an early flight from Harlingen Airport to Seattle / Tacoma International Airport, these stays will have you moments from your departure gate:

      Arriving at Seattle / Tacoma International Airport (SEA)

      When to fly to Seattle / Tacoma International Airport (SEA)

      • It's time to work out your travel dates for your flight from Harlingen Airport to Seattle / Tacoma International Airport. July is the most popular month to visit Seattle. If you want a more laid-back vibe, go in March.

      • The warmest month in Seattle is August, with temperatures ranging between 12ºC (54ºF) and 28ºC (82ºF). Book your flights from Harlingen Airport to Seattle / Tacoma International Airport in this month if this is the type of weather you enjoy.

      • February has average temperatures of between -1ºC (30ºF) and 11ºC (52ºF). Search for cheap tickets from HRL to SEA around that time if you'd rather travel in cooler conditions.

      Explore more of the United States

      • You've seen Seattle, now it's time to discover other corners of the United States. Travel around 241 kilometres south to Portland to check off its leading attractions. From Portland Japanese Garden to Peninsula Park Rose Garden and Beyond Van Gogh Portland, you've got a jam-packed schedule ahead.

      • Around 370 kilometres east of Seattle, Spokane is another favourite stop in the United States. Start your sightseeing at Riverside State Park, Spokane Falls (Upper Falls) and Cathedral of Our Lady of Lourdes.

      Plan smart, explore more

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      Prices shown on this page are estimated lowest prices only. Found in the last 12 days.