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Cheap flights from Portland to Rock Springs from $331

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Rock Springs departing on 9/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Portland to Rock Springs

Cheap round-trip flights

Multiple Airlines Logo
PDX-RKS
729 mimulti-stop
Multiple Airlines Logo
RKS-PDX
729 mimulti-stop
Multiple Airlines
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United Airlines flights from Portland to Rock Springs

Our best United Airlines deals on Portland to Rock Springs flight tickets
United Airlines
Aug 10
PDX5:00 amPortland
7h 05m
1 stop
RKS1:05 pmRock Springs Sweetwater County
Aug 16
RKS5:33 amRock Springs Sweetwater County
4h 59m
1 stop
PDX9:32 amPortland
$609
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United Airlines
Aug 10
PDX5:00 amPortland
7h 05m
1 stop
RKS1:05 pmRock Springs Sweetwater County
Aug 16
RKS1:48 pmRock Springs Sweetwater County
11h 47m
2 stops
PDX12:35 amPortland
$614
Find similar
United Airlines
Aug 10
PDX5:00 amPortland
7h 05m
1 stop
RKS1:05 pmRock Springs Sweetwater County
Aug 16
RKS5:33 amRock Springs Sweetwater County
4h 59m
1 stop
PDX9:32 amPortland
$624
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland to Rock Springs 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 August 3, 2025.
Use the filters below to find and compare flights from Portland to Rock Springs that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Mon 9/29

6:25 pm-10:07 pm

1 stop26h 42m

$331

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Mon 9/29

5:15 pm-10:07 pm

2 stops27h 52m

$346

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from Portland to Rock Springs

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 airline that flies from Portland to Rock Springs Sweetwater County?

United Airlines is the most popular carrier operating from Portland to Rock Springs Sweetwater County

When to book flights from Portland to Rock Springs

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to Rock Springs according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland to Rock Springs (PDX to RKS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to Rock Springs

Fastest flight time

26h 42m

Direct flights

None

Airports in Rock Springs

1 airport
The fastest flight from Portland to Rock Springs takes 26h 42m
There are no direct flights from Portland to Rock Springs. Popular non-direct route for this connection is Portland Airport - Rock Springs Sweetwater County Airport.
There is 1 airport near Rock Springs: Rock Springs Sweetwater County (RKS)
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  • How far is Portland to Rock Springs Sweetwater County by plane?

    Portland and Rock Springs Sweetwater County are 725.7 mi apart from one another.

  • When did momondo last update prices for flights from Portland Airport to Rock Springs Sweetwater County Airport?

    Prices for flights from Portland Airport to Rock Springs Sweetwater County Airport were last updated today.

  • How old do you have to be to fly from Portland Airport to Rock Springs Sweetwater County Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Portland Airport to Rock Springs Sweetwater County Airport.

  • What documentation or ID do you need to fly to Rock Springs Sweetwater County Airport?

    The required travel and health documents for your Rock Springs Sweetwater County Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Rock Springs Sweetwater County Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near Rock Springs?

Book flights to Rock Springs if you plan to visit one of these locations
Green River

Why use momondo?

Why should I use momondo to find a flight deal from Portland to Rock Springs?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Rock Springs from Portland.

Can I find flights from Portland to Rock Springs with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Rock Springs from Portland with this policy.

How can momondo help me find flights from Portland to Rock Springs?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Rock Springs from Portland.

I’m not ready to book a flight from Portland to Rock Springs right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Rock Springs from Portland. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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