United Flight 688 Deals & Information (2026/2027)

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United Flight 688 Route Deals From $163

The cheapest prices found with in the last 7 days for return flights were $255 and $163 for one-way flights to Washington Dulles Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Sep 15 - Sat, Sep 19
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$255 Roundtrip, found 2 days ago
$255
Roundtrip
found 2 days ago
Select United flight, departing Tue, Sep 15 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Sat, Sep 19, priced at $255 found 2 days ago
Thu, Sep 24 - Tue, Sep 29
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$261 Roundtrip, found 6 days ago
$261
Roundtrip
found 6 days ago
Select United flight, departing Thu, Sep 24 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Tue, Sep 29, priced at $261 found 6 days ago
Tue, Sep 15 - Sat, Sep 19
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$275 Roundtrip, found 2 days ago
$275
Roundtrip
found 2 days ago
Select United flight, departing Tue, Sep 15 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Sat, Sep 19, priced at $275 found 2 days ago
Thu, Aug 20 - Wed, Aug 26
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$275 Roundtrip, found 21 hours ago
$275
Roundtrip
found 21 hours ago
Select United flight, departing Thu, Aug 20 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Wed, Aug 26, priced at $275 found 21 hours ago
Mon, Aug 24 - Wed, Sep 9
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$277 Roundtrip, found 5 days ago
$277
Roundtrip
found 5 days ago
Select United flight, departing Mon, Aug 24 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Wed, Sep 9, priced at $277 found 5 days ago
Fri, Aug 28 - Sat, Aug 29
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$291 Roundtrip, found 6 days ago
$291
Roundtrip
found 6 days ago
Select United flight, departing Fri, Aug 28 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Sat, Aug 29, priced at $291 found 6 days ago
Fri, Sep 11 - Sat, Sep 12
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$293 Roundtrip, found 5 days ago
$293
Roundtrip
found 5 days ago
Select United flight, departing Fri, Sep 11 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Sat, Sep 12, priced at $293 found 5 days ago
Mon, Aug 24 - Sun, Sep 6
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$296 Roundtrip, found 5 days ago
$296
Roundtrip
found 5 days ago
Select United flight, departing Mon, Aug 24 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Sun, Sep 6, priced at $296 found 5 days ago
Wed, Aug 26 - Tue, Sep 1
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$299 Roundtrip, found 4 days ago
$299
Roundtrip
found 4 days ago
Select United flight, departing Wed, Aug 26 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Tue, Sep 1, priced at $299 found 4 days ago
Sat, Sep 12 - Thu, Sep 24
SEA
Seattle - Tacoma Intl.
IAD
Washington Dulles Intl.
$301 Roundtrip, found 5 days ago
$301
Roundtrip
found 5 days ago
Select United flight, departing Sat, Sep 12 from Seattle - Tacoma Intl. to Washington Dulles Intl., returning Thu, Sep 24, priced at $301 found 5 days ago

Frequently asked questions

What route does flight number UA688 take?
You'll be arriving into O'Hare Airport from Louis Armstrong New Orleans Intl. Airport (MSY) if you're traveling on flight number UA688. You'll be in the sky for 2 hours and 30 minutes on this trip. It's also worthwhile noting that the flight conveniently travels non-stop.
What kind of plane is on flight number UA688?
Get ready to climb aboard an Airbus A319 if you have a seat on flight UA688. Most flights from New Orleans, LA Airport (MSY-Louis Armstrong New Orleans Intl.) to Chicago, IL Airport (ORD-O'Hare Intl.) are operated using this type of plane.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA688 flight with Travelocity, please visit our Customer Service Portal.