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Flights from Portland to Williston

Explore the cheapest flights from Portland to Williston in the next three months. Based on Trip.com's data from the latest 7 days, one-way fares start at €290, and round-trip tickets start at €607.

      • PDX 2:45 PM
        6h 58m
        1 stop
        XWA 11:43 PM
        Portland - Williston | Thu, Dec 25 | United Airlines
        XWA 6:22 PM
        25h 9m
        1 stop
        PDX 5:31 PM
        Williston - Portland | Mon, Dec 29 | United Airlines
        €607 €1,115
        46% OFF
        46% OFF
        €1,115 €607
      • PDX 5:00 AM
        6h 21m
        1 stop
        XWA 1:21 PM
        Portland - Williston | Sun, Dec 21 | United Airlines
        XWA 7:00 AM
        8h 35m
        1 stop
        PDX 1:35 PM
        Williston - Portland | Thu, Dec 25 | United Airlines
        €652 €1,115
        42% OFF
        42% OFF
        €1,115 €652
      • PDX 5:00 AM
        27h 49m
        1 stop
        XWA 10:49 AM
        Portland - Williston | Mon, Dec 22 | United Airlines
        XWA 6:22 PM
        6h 37m
        1 stop
        PDX 10:59 PM
        Williston - Portland | Fri, Dec 26 | United Airlines
        €751 €1,115
        33% OFF
        33% OFF
        €1,115 €751
      • PDX 12:16 PM
        8h 26m
        1 stop
        XWA 10:42 PM
        Portland - Williston | Mon, Dec 22 | Delta Air Lines
        XWA 11:28 AM
        8h 3m
        1 stop
        PDX 5:31 PM
        Williston - Portland | Fri, Dec 26 | United Airlines
        €959
        14% OFF
        €1,115 €959
      • PDX 1:00 PM
        17h 25m
        1 stop
        ISN Invalid Date
        Portland - Williston | Mon, Dec 15 | Normal Airline
        ISN 3:00 PM
        6h
        Nonstop
        PDX 4:00 PM
        Williston - Portland | Wed, Dec 17 | Normal Airline
        Find More Flights
        Find More Flights
      • PDX 4:02 PM
        5h 53m
        1 stop
        XWA 11:55 PM
        Portland - Williston | Wed, Dec 17 | United Airlines
        €290 €337
        14% OFF
        14% OFF
        €337 €290
      • PDX 1:00 PM
        17h 25m
        1 stop
        ISN Invalid Date
        Portland - Williston | Mon, Dec 15 | Normal Airline
        Find More Flights
        Find More Flights

Displayed flight fares from Portland to Williston are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flying from Portland to Williston

The distance between Portland and Williston is approximately 1,465.04 km. Based on Trip.com's data, travel demand peaks in October. The off-season for travel is September.

Cheapest one-way flight price€290
Cheapest round-trip ticket price€607
Off-season for travelSeptember
Peak season for travelOctober
Flight distance1,465.04 km

When is the cheapest time to fly from Portland to Williston?

The cheapest time for Portland to Williston flights: Dec 14 to Dec 21 — one way flight prices from €290.

Cheapest flights
From price
Search
  • 714
  • 1421
  • 2128

  • Jan

    284
  • 411
  • 1118
  • 1825

  • Feb

    251
  • 18
  • 815
  • 1522

  • Mar

    221
Displayed fare trends are based on Trip.com's aggregated average of the lowest flight prices from Portland to Williston, calculated over the upcoming 10 weeks.

Frequently Asked Questions

  • What are the cheapest flights from Portland to Williston (PDX-ISN)?

    Based on Trip.com data, United Airlines offers one-way fares as low as €290 on Cheapest nonstop routes (e.g. PDX to XWA on Wed, Dec 17), while United Airlines offers Cheapest nonstop round-trips from €607 departing on Thu, Dec 25 and returning on Mon, Dec 29.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Portland to Williston is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Portland to Williston, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Wed, Dec 17, with one-way flights priced at just €290.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is United Airlines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Williston travel is around October.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Portland to Williston is September, when demand for travel is lower.
  • After crunching the numbers on our December flight calendar, it's currently cheapest to fly from Portland to Williston on December 25, 2025 with United Airlines, with prices starting at €606.
  • The time difference between Williston and Portland is 2h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

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