United Flight UA678 Deals & Information (2025/2026)

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United Flight 678 Route Deals From $91

The cheapest prices found with in the last 7 days for return flights were $228 and $91 for one-way flights to George Bush Intercontinental for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Aug 20 - Mon, Aug 25
MFE
Miller Intl.
IAH
George Bush Intercontinental
$228 Roundtrip, found 6 days ago
$228
Roundtrip
found 6 days ago
Select United flight, departing Wed, Aug 20 from Miller Intl. to George Bush Intercontinental, returning Mon, Aug 25, priced at $228 found 6 days ago
Sat, Jul 26 - Sun, Aug 3
MFE
Miller Intl.
IAH
George Bush Intercontinental
$237 Roundtrip, found 5 days ago
$237
Roundtrip
found 5 days ago
Select United flight, departing Sat, Jul 26 from Miller Intl. to George Bush Intercontinental, returning Sun, Aug 3, priced at $237 found 5 days ago
Fri, Jul 18 - Sun, Jul 20
MFE
Miller Intl.
IAH
George Bush Intercontinental
$243 Roundtrip, found 19 hours ago
$243
Roundtrip
found 19 hours ago
Select United flight, departing Fri, Jul 18 from Miller Intl. to George Bush Intercontinental, returning Sun, Jul 20, priced at $243 found 19 hours ago
Wed, Sep 17 - Sun, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$244 Roundtrip, found 5 days ago
$244
Roundtrip
found 5 days ago
Select United flight, departing Wed, Sep 17 from Miller Intl. to George Bush Intercontinental, returning Sun, Sep 21, priced at $244 found 5 days ago
Wed, Aug 20 - Mon, Aug 25
MFE
Miller Intl.
IAH
George Bush Intercontinental
$249 Roundtrip, found 6 days ago
$249
Roundtrip
found 6 days ago
Select United flight, departing Wed, Aug 20 from Miller Intl. to George Bush Intercontinental, returning Mon, Aug 25, priced at $249 found 6 days ago
Mon, Aug 4 - Wed, Aug 6
MFE
Miller Intl.
IAH
George Bush Intercontinental
$249 Roundtrip, found 2 days ago
$249
Roundtrip
found 2 days ago
Select United flight, departing Mon, Aug 4 from Miller Intl. to George Bush Intercontinental, returning Wed, Aug 6, priced at $249 found 2 days ago
Fri, Jul 18 - Sun, Jul 20
MFE
Miller Intl.
IAH
George Bush Intercontinental
$253 Roundtrip, found 19 hours ago
$253
Roundtrip
found 19 hours ago
Select United flight, departing Fri, Jul 18 from Miller Intl. to George Bush Intercontinental, returning Sun, Jul 20, priced at $253 found 19 hours ago
Wed, Sep 17 - Sun, Sep 21
MFE
Miller Intl.
IAH
George Bush Intercontinental
$255 Roundtrip, found 5 days ago
$255
Roundtrip
found 5 days ago
Select United flight, departing Wed, Sep 17 from Miller Intl. to George Bush Intercontinental, returning Sun, Sep 21, priced at $255 found 5 days ago
Fri, Jul 18 - Sun, Jul 20
MFE
Miller Intl.
IAH
George Bush Intercontinental
$262 Roundtrip, found 19 hours ago
$262
Roundtrip
found 19 hours ago
Select United flight, departing Fri, Jul 18 from Miller Intl. to George Bush Intercontinental, returning Sun, Jul 20, priced at $262 found 19 hours ago
Mon, Aug 4 - Wed, Aug 6
MFE
Miller Intl.
IAH
George Bush Intercontinental
$279 Roundtrip, found 2 days ago
$279
Roundtrip
found 2 days ago
Select United flight, departing Mon, Aug 4 from Miller Intl. to George Bush Intercontinental, returning Wed, Aug 6, priced at $279 found 2 days ago

Frequently asked questions

What route does flight number UA678 take?
Flight number UA678 operates directly from Washington, DC Airport (IAD-Washington Dulles Intl.) to MIA. During this trip, you'll be in the air for 2 hours and 40 minutes. Consider booking ahead to secure your favorite seat.
What kind of plane is on flight number UA678?
The route for UA678 is generally Washington, DC Airport (IAD-Washington Dulles Intl.) to MIA, and the Airbus A319 is the type of aircraft you'll probably be heading off on.
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 UA678 flight with Travelocity, please visit our Customer Service Portal.