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Cheap flights from Portland to Rock Springs from $308

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Rock Springs departing on 3/7. 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

United Airlines Logo
5:15 am - 1:30 pmPDX-RKS
7h 15m1 stop
United Airlines Logo
5:25 am - 9:40 amRKS-PDX
5h 15m1 stop
$308United Airlines
Find Deal
Sat, Mar 7 - Tue, Mar 10
United Airlines Logo
5:15 am - 1:30 pmPDX-RKS
7h 15m1 stop
United Airlines Logo
2:05 pm - 12:19 amRKS-PDX
11h 14m2 stops
$314United Airlines
Find Deal
Sat, Mar 7 - Tue, Mar 10
United Airlines Logo
8:15 am - 10:01 pmPDX-RKS
12h 46m2 stops
United Airlines Logo
2:05 pm - 12:19 amRKS-PDX
11h 14m2 stops
$404United Airlines
Find Deal
Sat, Mar 7 - Tue, Mar 10
United Airlines Logo
5:45 am - 12:30 pmPDX-RKS
29h 45m3 stops
United Airlines Logo
2:05 pm - 12:19 amRKS-PDX
11h 14m2 stops
$478United Airlines
Find Deal
Sat, Mar 7 - Tue, Mar 10
United Airlines Logo
12:53 pm - 10:07 pmPDX-RKS
8h 14m1 stop
United Airlines Logo
2:00 pm - 9:06 pmRKS-PDX
8h 06m1 stop
$685United Airlines
Find Deal
Mon, Sep 29 - Wed, Oct 1
United Airlines Logo
5:00 am - 1:23 pmPDX-RKS
7h 23m1 stop
United Airlines Logo
5:15 am - 2:42 pmRKS-PDX
10h 27m2 stops
$691United Airlines
Find Deal
Mon, Sep 29 - Wed, Oct 1
United Airlines Logo
7:30 am - 10:07 pmPDX-RKS
13h 37m2 stops
United Airlines Logo
2:00 pm - 12:28 amRKS-PDX
11h 28m2 stops
$696United Airlines
Find Deal
Mon, Sep 29 - Wed, Oct 1
United Airlines Logo
5:30 am - 10:07 pmPDX-RKS
15h 37m3 stops
United Airlines Logo
2:00 pm - 12:28 amRKS-PDX
11h 28m2 stops
$1,141United Airlines
Find Deal
Mon, Sep 29 - Wed, Oct 1

United Airlines flights from Portland to Rock Springs

Our best United Airlines deals on Portland to Rock Springs flight tickets
United Airlines
Mar 7
PDX5:15 amPortland
7h 15m
1 stop
RKS1:30 pmRock Springs Sweetwater County
Mar 10
RKS5:25 amRock Springs Sweetwater County
5h 15m
1 stop
PDX9:40 amPortland
$308
Find similar
United Airlines
Mar 7
PDX5:15 amPortland
7h 15m
1 stop
RKS1:30 pmRock Springs Sweetwater County
Mar 10
RKS2:05 pmRock Springs Sweetwater County
11h 14m
2 stops
PDX12:19 amPortland
$314
Find similar
United Airlines
Mar 7
PDX8:15 amPortland
12h 46m
2 stops
RKS10:01 pmRock Springs Sweetwater County
Mar 10
RKS2:05 pmRock Springs Sweetwater County
11h 14m
2 stops
PDX12:19 amPortland
$404
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 September 17, 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

Sat 3/7

5:15 am-1:30 pm

1 stop7h 15m

Rock Springs Sweetwater County

Tue 3/10

5:25 am-9:40 am

1 stop5h 15m

$308

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Sat 3/7

5:15 am-1:30 pm

1 stop7h 15m

Rock Springs Sweetwater County

Tue 3/10

2:05 pm-12:19 am

2 stops11h 14m

$314

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Sat 3/7

8:15 am-10:01 pm

2 stops12h 46m

Rock Springs Sweetwater County

Tue 3/10

2:05 pm-12:19 am

2 stops11h 14m

$404

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Sat 3/7

5:45 am-12:30 pm

3 stops29h 45m

Rock Springs Sweetwater County

Tue 3/10

2:05 pm-12:19 am

2 stops11h 14m

$478

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Mon 9/29

12:53 pm-10:07 pm

1 stop8h 14m

Rock Springs Sweetwater County

Wed 10/1

2:00 pm-9:06 pm

1 stop8h 06m

$685

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Mon 9/29

5:00 am-1:23 pm

1 stop7h 23m

Rock Springs Sweetwater County

Wed 10/1

5:15 am-2:42 pm

2 stops10h 27m

$691

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Mon 9/29

7:30 am-10:07 pm

2 stops13h 37m

Rock Springs Sweetwater County

Wed 10/1

2:00 pm-12:28 am

2 stops11h 28m

$696

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Mon 9/29

5:30 am-10:07 pm

3 stops15h 37m

Rock Springs Sweetwater County

Wed 10/1

2:00 pm-12:28 am

2 stops11h 28m

$1,141

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Mon 9/29

4:07 pm-10:07 pm

1 stop5h 00m

$316

PortlandRock Springs

PDX - RKS

PDXRKS

Portland

Mon 9/29

5:30 am-10:07 pm

3 stops15h 37m

$327

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Rock Springs from

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

Direct flights

None
There are no direct flights from Portland to Rock Springs. There are no popular flight routes from Portland to Rock Springs.
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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. By plane, this route typically takes 7h 15m.

  • 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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