What is the cheapest airline that flies from Las Vegas Harry Reid Intl to South Dakota?

Allegiant Air, Frontier, and Delta are the most popular carriers operating from Las Vegas Harry Reid Intl to South Dakota

What airlines fly to South Dakota?

Allegiant Air, United Airlines and American Airlines are the top three most popular airlines that fly to South Dakota from Las Vegas according to our data. Allegiant Air is the first choice among our users, with 61% of people opting to fly with this airline when traveling to South Dakota. Keep in mind that there are 5 different airlines that fly to South Dakota on a routine basis, so you have a few additional options to choose from.

How many flights depart from Las Vegas to South Dakota on average per week?

As of August 2026, there are 1 flights per week flying from Las Vegas to South Dakota. The most common day of the week flights depart is Thu, with 100% of flights taking off on this day.

When did momondo last update prices for flights from Las Vegas Harry Reid Intl Airport to South Dakota?

Prices for flights from Las Vegas Harry Reid Intl Airport to South Dakota are refreshed on a daily basis.

How many operators does momondo search for flights from Las Vegas Harry Reid Intl Airport to South Dakota?

As of August 2026, there are 5 operators available to choose from for flights from Las Vegas Harry Reid Intl Airport to South Dakota.

How old do you have to be to fly from Las Vegas Harry Reid Intl Airport to South Dakota?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Las Vegas Harry Reid Intl Airport to South Dakota.

What documentation or ID do you need to fly to South Dakota?

The travel and health documents required for your trip to South Dakota can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at South Dakota. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$47 Cheap Flights from Las Vegas to South Dakota in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Las Vegas to South Dakota

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:10 am - 10:56 amLAS Las Vegas Harry Reid Intl-FSD Sioux Falls Joe Foss Field

2h 46mnonstop

1:56 pm - 2:54 pmFSD Sioux Falls Joe Foss Field-LAS Las Vegas Harry Reid Intl

2h 58mnonstop

$93Allegiant Air

Thu, Oct 22 - Sun, Oct 25

6:10 am - 10:56 amLAS Las Vegas Harry Reid Intl-FSD Sioux Falls Joe Foss Field

2h 46mnonstop

1:56 pm - 2:54 pmFSD Sioux Falls Joe Foss Field-LAS Las Vegas Harry Reid Intl

2h 58mnonstop

$101Allegiant Air

Thu, Oct 22 - Sun, Oct 25

9:30 pm - 6:49 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

20h 19m1 stop Phoenix Sky Harbor Intl

3:34 pm - 4:56 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 22mnonstop

$183Multiple Airlines

Thu, Sep 17 - Sun, Sep 20

10:07 pm - 5:21 pmLAS Las Vegas Harry Reid Intl-FSD Sioux Falls Joe Foss Field

17h 14m1 stop Phoenix Sky Harbor Intl

10:00 pm - 10:53 pmFSD Sioux Falls Joe Foss Field-LAS Las Vegas Harry Reid Intl

2h 53mnonstop

$188Multiple Airlines

Thu, Aug 27 - Sun, Aug 30

10:30 am - 6:36 pmLAS Las Vegas Harry Reid Intl-FSD Sioux Falls Joe Foss Field

6h 06m1 stop Denver Intl

7:31 pm - 7:25 amFSD Sioux Falls Joe Foss Field-LAS Las Vegas Harry Reid Intl

13h 54m1 stop Denver Intl

$196Frontier

Sat, Oct 17 - Wed, Oct 21

10:30 am - 6:36 pmLAS Las Vegas Harry Reid Intl-FSD Sioux Falls Joe Foss Field

6h 06m1 stop Denver Intl

7:31 pm - 11:31 pmFSD Sioux Falls Joe Foss Field-LAS Las Vegas Harry Reid Intl

6h 00m1 stop Denver Intl

$213Frontier

Fri, Oct 16 - Wed, Oct 21

9:37 am - 4:06 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

5h 29m1 stop Denver Intl

7:00 am - 10:49 amRAP Rapid City-LAS Las Vegas Harry Reid Intl

4h 49m1 stop Denver Intl

$310United Airlines

Wed, Sep 2 - Wed, Sep 9

5:20 am - 11:55 amLAS Las Vegas Harry Reid Intl-RAP Rapid City

5h 35m1 stop Denver Intl

11:22 am - 5:02 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

6h 40m1 stop Denver Intl

$310United Airlines

Wed, Sep 2 - Wed, Sep 9

6:44 am - 12:06 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

4h 22m1 stop Phoenix Sky Harbor Intl

11:45 am - 6:20 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

7h 35m1 stop Phoenix Sky Harbor Intl

$310American Airlines

Wed, Sep 16 - Wed, Sep 23

6:29 am - 12:08 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

4h 39m1 stop Phoenix Sky Harbor Intl

5:06 pm - 10:35 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

6h 29m1 stop Dallas/Fort Worth

$310American Airlines

Fri, Aug 28 - Tue, Sep 1

Cheap last minute flights

Enter your travel dates to find the best prices.

5:57 pm - 9:16 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

2h 19mnonstop

10:06 pm - 11:33 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 27mnonstop

$264Allegiant Air

Sun, Aug 9 - Thu, Aug 13

9:48 pm - 2:46 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

15h 58m1 stop Phoenix Sky Harbor Intl

10:06 pm - 11:33 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 27mnonstop

$291Multiple Airlines

Tue, Aug 11 - Thu, Aug 13

12:50 pm - 2:46 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

24h 56m2 stops San Diego Phoenix Sky Harbor Intl

10:06 pm - 11:33 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 27mnonstop

$325Multiple Airlines

Tue, Aug 11 - Thu, Aug 13

2:08 pm - 2:46 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

23h 38m3 stops Santa Ana J. Wayne/Orange Cnty Provo Phoenix-Mesa Gateway

10:06 pm - 11:33 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 27mnonstop

$377Multiple Airlines

Tue, Aug 11 - Thu, Aug 13

6:29 am - 12:08 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

4h 39m1 stop Phoenix Sky Harbor Intl

6:28 am - 12:54 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

7h 26m1 stop Dallas/Fort Worth

$380American Airlines

Tue, Aug 11 - Tue, Aug 18

8:04 am - 5:53 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

8h 49m2 stops Los Angeles Los Angeles Denver Intl

3:27 pm - 8:51 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

6h 24m1 stop Denver Intl

$464United Airlines

Tue, Aug 11 - Tue, Aug 18

5:20 am - 12:24 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

6h 04m1 stop Denver Intl

5:58 pm - 9:59 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

5h 01m1 stop Denver Intl

$611United Airlines

Tue, Aug 11 - Wed, Aug 12

6:00 pm - 9:11 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

26h 11m2 stops Spokane Phoenix-Mesa Gateway

10:06 pm - 11:33 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 27mnonstop

$614Allegiant Air

Sun, Aug 9 - Thu, Aug 13

6:20 am - 1:48 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

6h 28m1 stop Minneapolis St Paul

2:32 pm - 8:16 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

6h 44m1 stop Minneapolis St Paul

$651Delta

Mon, Aug 10 - Wed, Aug 12

2:34 pm - 11:52 pmLAS Las Vegas Harry Reid Intl-FSD Sioux Falls Joe Foss Field

7h 18m2 stops Los Angeles Los Angeles Phoenix Sky Harbor Intl

7:30 am - 2:45 pmFSD Sioux Falls Joe Foss Field-LAS Las Vegas Harry Reid Intl

9h 15m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

$1,428American Airlines

Sun, Aug 9 - Tue, Aug 11

Cheap direct flights

Enter your travel dates to find the best prices.

6:10 am - 10:56 amLAS Las Vegas Harry Reid Intl-FSD Sioux Falls Joe Foss Field

2h 46mnonstop

1:56 pm - 2:54 pmFSD Sioux Falls Joe Foss Field-LAS Las Vegas Harry Reid Intl

2h 58mnonstop

$93Allegiant Air

Thu, Oct 22 - Sun, Oct 25

6:10 am - 10:56 amLAS Las Vegas Harry Reid Intl-FSD Sioux Falls Joe Foss Field

2h 46mnonstop

1:56 pm - 2:54 pmFSD Sioux Falls Joe Foss Field-LAS Las Vegas Harry Reid Intl

2h 58mnonstop

$101Allegiant Air

Thu, Oct 22 - Sun, Oct 25

8:30 am - 11:46 amLAS Las Vegas Harry Reid Intl-RAP Rapid City

2h 16mnonstop

3:34 pm - 4:56 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 22mnonstop

$102Allegiant Air

Thu, Sep 10 - Sun, Sep 20

12:40 pm - 3:55 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

2h 15mnonstop

3:30 pm - 4:51 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 21mnonstop

$105Allegiant Air

Thu, Aug 20 - Sun, Aug 23

11:25 am - 2:40 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

2h 15mnonstop

3:34 pm - 4:56 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 22mnonstop

$108Allegiant Air

Sun, Aug 30 - Sun, Sep 6

8:30 am - 11:46 amLAS Las Vegas Harry Reid Intl-RAP Rapid City

2h 16mnonstop

3:34 pm - 4:56 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 22mnonstop

$108Allegiant Air

Thu, Sep 3 - Sun, Sep 20

8:30 am - 11:46 amLAS Las Vegas Harry Reid Intl-RAP Rapid City

2h 16mnonstop

12:36 pm - 1:58 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 22mnonstop

$112Allegiant Air

Thu, Sep 3 - Thu, Sep 10

11:25 am - 2:40 pmLAS Las Vegas Harry Reid Intl-RAP Rapid City

2h 15mnonstop

3:34 pm - 4:56 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 22mnonstop

$114Allegiant Air

Sun, Aug 30 - Sun, Sep 6

8:30 am - 11:46 amLAS Las Vegas Harry Reid Intl-RAP Rapid City

2h 16mnonstop

3:34 pm - 4:56 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 22mnonstop

$114Allegiant Air

Thu, Sep 3 - Sun, Sep 20

8:30 am - 11:46 amLAS Las Vegas Harry Reid Intl-RAP Rapid City

2h 16mnonstop

12:36 pm - 1:58 pmRAP Rapid City-LAS Las Vegas Harry Reid Intl

2h 22mnonstop

$121Allegiant Air

Thu, Sep 3 - Thu, Sep 10

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Frontier flights from Las Vegas to South Dakota

Our best Frontier deals on Las Vegas to South Dakota flight tickets

Frontier

Oct 17

LAS10:30 amLas Vegas Harry Reid Intl

6h 06m

1 stop

FSD6:36 pmSioux Falls Joe Foss Field

Oct 21

FSD7:31 pmSioux Falls Joe Foss Field

13h 54m

1 stop

LAS7:25 amLas Vegas Harry Reid Intl

$196

Frontier

Oct 16

LAS10:30 amLas Vegas Harry Reid Intl

6h 06m

1 stop

FSD6:36 pmSioux Falls Joe Foss Field

Oct 21

FSD7:31 pmSioux Falls Joe Foss Field

6h 00m

1 stop

LAS11:31 pmLas Vegas Harry Reid Intl

$213

Frontier

Oct 23

LAS10:30 amLas Vegas Harry Reid Intl

6h 06m

1 stop

FSD6:36 pmSioux Falls Joe Foss Field

Oct 26

FSD7:31 pmSioux Falls Joe Foss Field

6h 00m

1 stop

LAS11:31 pmLas Vegas Harry Reid Intl

$230

Allegiant Air flights from Las Vegas to South Dakota

Our best Allegiant Air deals on Las Vegas to South Dakota flight tickets

Allegiant Air

Oct 22

LAS6:10 amLas Vegas Harry Reid Intl

2h 46m

FSD10:56 amSioux Falls Joe Foss Field

Oct 25

FSD1:56 pmSioux Falls Joe Foss Field

2h 58m

LAS2:54 pmLas Vegas Harry Reid Intl

$93

Allegiant Air

Sep 10

LAS8:30 amLas Vegas Harry Reid Intl

2h 16m

RAP11:46 amRapid City

Sep 20

RAP3:34 pmRapid City

2h 22m

LAS4:56 pmLas Vegas Harry Reid Intl

$100

Allegiant Air

Oct 22

LAS6:10 amLas Vegas Harry Reid Intl

2h 46m

FSD10:56 amSioux Falls Joe Foss Field

Oct 25

FSD1:56 pmSioux Falls Joe Foss Field

2h 58m

LAS2:54 pmLas Vegas Harry Reid Intl

$101

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

Las VegasSioux Falls

LAS Las Vegas Harry Reid Intl - FSD Sioux Falls Joe Foss Field

LASFSD

Las Vegas Harry Reid Intl

Thu 10/22

6:10 am-10:56 am

Nonstop2h 46m

Sioux Falls Joe Foss Field

Sun 10/25

1:56 pm-2:54 pm

Nonstop2h 58m

$93

Las VegasSioux Falls

LAS Las Vegas Harry Reid Intl - FSD Sioux Falls Joe Foss Field

LASFSD

Las Vegas Harry Reid Intl

Thu 10/22

6:10 am-10:56 am

Nonstop2h 46m

Sioux Falls Joe Foss Field

Sun 10/25

1:56 pm-2:54 pm

Nonstop2h 58m

$101

Las VegasRapid City

LAS Las Vegas Harry Reid Intl - RAP Rapid City

LASRAP

Las Vegas Harry Reid Intl

Thu 9/17

9:30 pm-6:49 pm

1 stop20h 19m

Rapid City

Sun 9/20

3:34 pm-4:56 pm

Nonstop2h 22m

$183

Las VegasSioux Falls

LAS Las Vegas Harry Reid Intl - FSD Sioux Falls Joe Foss Field

LASFSD

Las Vegas Harry Reid Intl

Thu 8/27

10:07 pm-5:21 pm

1 stop17h 14m

Sioux Falls Joe Foss Field

Sun 8/30

10:00 pm-10:53 pm

Nonstop2h 53m

$188

Las VegasSioux Falls

LAS Las Vegas Harry Reid Intl - FSD Sioux Falls Joe Foss Field

LASFSD

Las Vegas Harry Reid Intl

Sat 10/17

10:30 am-6:36 pm

1 stop6h 06m

Sioux Falls Joe Foss Field

Wed 10/21

7:31 pm-7:25 am

1 stop13h 54m

$196

Las VegasSioux Falls

LAS Las Vegas Harry Reid Intl - FSD Sioux Falls Joe Foss Field

LASFSD

Las Vegas Harry Reid Intl

Fri 10/16

10:30 am-6:36 pm

1 stop6h 06m

Sioux Falls Joe Foss Field

Wed 10/21

7:31 pm-11:31 pm

1 stop6h 00m

$213

Las VegasRapid City

LAS Las Vegas Harry Reid Intl - RAP Rapid City

LASRAP

Las Vegas Harry Reid Intl

Wed 9/2

9:37 am-4:06 pm

1 stop5h 29m

Rapid City

Wed 9/9

7:00 am-10:49 am

1 stop4h 49m

$310

Las VegasRapid City

LAS Las Vegas Harry Reid Intl - RAP Rapid City

LASRAP

Las Vegas Harry Reid Intl

Wed 9/2

5:20 am-11:55 am

1 stop5h 35m

Rapid City

Wed 9/9

11:22 am-5:02 pm

1 stop6h 40m

$310

Las VegasRapid City

LAS Las Vegas Harry Reid Intl - RAP Rapid City

LASRAP

Las Vegas Harry Reid Intl

Wed 9/16

6:44 am-12:06 pm

1 stop4h 22m

Rapid City

Wed 9/23

11:45 am-6:20 pm

1 stop7h 35m

$310

Las VegasRapid City

LAS Las Vegas Harry Reid Intl - RAP Rapid City

LASRAP

Las Vegas Harry Reid Intl

Fri 8/28

6:29 am-12:08 pm

1 stop4h 39m

Rapid City

Tue 9/1

5:06 pm-10:35 pm

1 stop6h 29m

$310

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Las Vegas to South Dakota

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

Prices

Airlines

Other information

What is the cheapest month to fly to South Dakota?

The month of October is, on average, the cheapest month to fly to South Dakota from Las Vegas, with most prices found around $180. If you aren’t able to travel to South Dakota during the month of October, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $192.

What is the cheapest day to depart on your flight to South Dakota?

The cheapest day to depart from Las Vegas to South Dakota is on a Tuesday. Travelers who choose to depart for South Dakota on a Tuesday will often find tickets for as low as $157. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $254. These prices are subject to change though, so be sure to set up a Price Alert for flights to South Dakota.

What is the cheapest time of day to depart on your flight to South Dakota?

The cheapest time of day to fly to South Dakota is in the afternoon when flights can be purchased for as low as $200. In the morning is when there is more demand to fly to South Dakota, so prices are often more expensive at around $213 per ticket.

What is the cheapest Las Vegas Harry Reid Intl to South Dakota flight route?

Fly from Las Vegas Harry Reid Intl to Rapid City for the best Las Vegas Harry Reid Intl - South Dakota flight prices

What cabin class options are available on Las Vegas to South Dakota flights?

There is only 1 cabin class available to choose from on Las Vegas to South Dakota flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Las Vegas to South Dakota flights?

No. A direct flight is the cheapest option for a flight between Las Vegas to South Dakota.

Cheap Las Vegas to South Dakota flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Las Vegas to South Dakota

Best Price Found	$61
Fastest flight time	2h 16m
Direct flights	Mon, Tue, Fri and Sat
Airports in South Dakota	20 airports

The best one-way flight to South Dakota from Las Vegas in the past 72 hours is $61. The best round-trip flight deal from Las Vegas to South Dakota found on momondo in the last 72 hours is $106.

The fastest flight from Las Vegas to South Dakota takes 2h 16m

Direct flights go from Las Vegas to South Dakota on Monday, Tuesday, Friday and Saturday. The only airline offering direct flights is Allegiant Air.

There are 20 airports in South Dakota. From Las Vegas there are direct flights to Rapid City (RAP), Sioux Falls Joe Foss Field (FSD).

Search flight deals

Frequently asked questions about flying from Las Vegas to South Dakota

When did momondo last update prices for flights from Las Vegas Harry Reid Intl Airport to South Dakota?
Prices for flights from Las Vegas Harry Reid Intl Airport to South Dakota are refreshed on a daily basis.
How many operators does momondo search for flights from Las Vegas Harry Reid Intl Airport to South Dakota?
As of August 2026, there are 5 operators available to choose from for flights from Las Vegas Harry Reid Intl Airport to South Dakota.
How old do you have to be to fly from Las Vegas Harry Reid Intl Airport to South Dakota?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Las Vegas Harry Reid Intl Airport to South Dakota.
What documentation or ID do you need to fly to South Dakota?
The travel and health documents required for your trip to South Dakota can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at South Dakota. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Las Vegas to South Dakota?
momondo data reveals that the most frequently booked plane model on the route from Las Vegas to South Dakota is Airbus A319, representing 82.35% of all bookings. The subsequent popular models are Airbus A320-100/200 at 11.76%, Airbus A320neo at 2.94%, and Airbus A321neo at 2.94%.

Best airlines flying from Las Vegas to South Dakota

Compare and see reviews for airlines that fly from Las Vegas to South Dakota with momondo

Airline	Rating	Free Cancellation	Price
Allegiant Air	PriceFrom $103	Free Cancellation	Rating 7.3 678 reviews	Search Allegiant Air flights
Frontier	PriceFrom $104	Free Cancellation	Rating 5.6 2,722 reviews	Search Frontier flights
American Airlines	PriceFrom $228	Free Cancellation	Rating 7.1 11,877 reviews	Search American Airlines flights
United Airlines	PriceFrom $251	Free Cancellation	Rating 7.4 10,084 reviews	Search United Airlines flights
Delta	PriceFrom $313	Free Cancellation	Rating 7.8 8,502 reviews	Search Delta flights

Why use momondo?

Why should I use momondo to find a flight deal from Las Vegas to South Dakota?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Las Vegas to South Dakota. momondo saves you time and could save you money on your trip.

Can I find flights from Las Vegas to South Dakota with flexible booking policies on momondo?

Yes. All flights to South Dakota from Las Vegas on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Las Vegas to South Dakota?

Once all potential Las Vegas to South Dakota flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Las Vegas to South Dakota right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to South Dakota from Las Vegas. 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.